ISO 9089:2019
(Main)Marine structures — Mobile offshore units — Mooring positioning windlasses and winches
Marine structures — Mobile offshore units — Mooring positioning windlasses and winches
This document specifies a classification, technical requirements and test methods, as well as designation, marking and documentation requirements for mooring positioning windlasses and winches of mobile offshore floating units, including drill-ships, semi-submersible drilling rigs, production platforms and offshore accommodation platforms. It can be used as a reference for ship-shifting positioning winches of pipelaying, crane and pile-driving vessels. This document is applicable to the design, manufacturing and acceptance testing of mooring positioning windlasses and winches.
Structures maritimes — Unités mobiles au large — Treuils d'ancrage
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ISO 9089:2019(E)
Deleted: /FDIS
Date: 2019-07 Deleted: 04
Deleted: /FDIS
Reference number of document: ISO 9089:2019(E)
Committee identification: ISO/TC 8/SC 4/WG 2
Secretariat: SAC
Marine structures — Mobile offshore units — Mooring positioning windlasses and
winches
© ISO 2019 – All rights reserved
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ISO 9089:2019(E)
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Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national
standards bodies (ISO member bodies). The work of preparing International Standards is normally
carried out through ISO technical committees. Each member body interested in a subject for which a
technical committee has been established has the right to be represented on that committee.
International organizations, governmental and non‐governmental, in liaison with ISO, also take part in
the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all
matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT),
see www.iso.org/iso/foreword.html.This document was prepared by Technical Committee 8, Ships and marine technology, Subcommittee 4,
Outfitting and deck machinery.This second edition cancels and replaces the first edition (ISO 9089:1985), which has been technically
revised.The main changes compared to the previous edition are as follows:
— Added no‐load, nominal load, nominal speed, stalling/slipping load, anchor deployment (anchor
dropping) speed limitation, anchor line length, speed and tension measurement, cable/wire rope
stopper, ratchet mechanisms, etc. to the functional and operational requirements.
— Refined all sub‐items in design and construction, and quantified the requirements of all indicators
and formula.— Provided an overview of various tests, and specified test types, methods and requirements.
— Provided check items, sequence, qualification criteria for type inspection of mooring positioning
windlass and winches.Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.© ISO 2019 – All rights reserved
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ISO 9089:2019(E)
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Marine structures — Mobile offshore units — Mooring positioning
windlasses and winches
1 Scope
This document specifies a classification, technical requirements and test methods, as well as
designation, marking and documentation requirements for mooring positioning windlasses and
winches of mobile offshore floating units, including drill‐ships, semi‐submersible drilling rigs,
production platforms and offshore accommodation platforms.It can be used as a reference for ship‐shifting positioning winches of pipelaying, crane and pile‐driving
vessels.This document is applicable to the design, manufacturing and acceptance testing of mooring positioning
windlasses and winches.2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 1704, Ships and marine technology — Stud-link anchor chainsISO 1968, Fibre ropes and cordage — Vocabulary
ISO 3108, Steel wire ropes — Test method — Determination of measured breaking force
ISO 3730, Shipbuilding and marine structures — Mooring winchesISO 3828, Shipbuilding and marine structures —Deck machinery — Vocabulary and symbols
ISO 6336, Calculation of load capacity of spur and helical gearsISO 6482, Shipbuilding — Deck machinery — Warping end profiles
ISO 7825:2017, Shipbuilding — Deck machinery — General requirements
ISO 9083, Calculation of load capacity of spur and helical gears — Application to marine gears
ISO 17893, Steel wire ropes — Vocabulary, designation and classificationISO 18692, Fibre ropes for offshore stationkeeping — Polyester
IEC 60092, Electrical installations in ships
IEC 61892, Mobile and fixed offshore units — Electrical installations
API Spec 2F, Specification for mooring chain
© ISO 2019 – All rights reserved
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ISO 9089:2019(E)
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3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 3828 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
mooring positioning windlass and winch
windlass and winch and associated electric control system used for mooring positioning of mobile
offshore floating units, including windlass and winch bodies (chain wheels/drums, drives, braking
systems, anchor deployment (anchor dropping) speed limiters, etc.), chain or wire rope stoppers,
anchor line guides and electric control system3.2 Right-hand (left hand) windlasses or winches
3.2.1
right-hand windlass or winch
windlass or winch where, in relation to an observer situated on the side of the prime mover, power
supply or controller, the drive for the cable‐lifter or drum is on the right of the cable‐lifter or drum
Note 1 to entry: See Figure 1.3.2.2
left-hand windlass or winch
windlass or winch where, in relation to an observer situated on the side of the prime mover, power
supply or controller, the drive for the cable‐lifter or drum is on the left of the cable‐lifter or drum
Note 1 to entry: See Figure 2.Deleted:
Figure 1— Right-hand windlass or winch
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ISO 9089:2019(E)
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Deleted:
Figure 2 — Left-hand windlass or winch
3.3
nominal load
maximum chain or rope tension that the windlass or winch is able to maintain continuously when
hauling at nominal speed, measured either at the cable‐lifter exit, or at the rope exit of the first layer in
the case of a drum4 Classification of mooring positioning windlasses and winches
Mooring positioning windlasses and winches are divided into the following types according to functions
and structural types.— Type A — positioning windlass (positioning windlass with mooring chains).
— Type B — positioning winch (positioning winch with steel wire ropes).
— Type C — friction positioning windlass and winch (positioning winches with friction drum).
— Type D — positioning windlass and winch of combined mooring chains and steel wire ropes
(positioning windlass and winch capable of hauling in both mooring chains and steel wire ropes).
— Type E — hoisting positioning windlass driven by the cylinder.5 Functional and operational requirements
5.1 General
Windlass and winches shall meet the general requirements for mooring winches in ISO 3730.
5.2 No-loadThe windlass and winch operating under no‐load at nominal speed shall be free from abnormal
vibration or noise; the hydraulic system shall act flexibly and reliably without oil seepage or leakage.
5.3 Nominal loadThe nominal load of the windlass and winch shall meet the following requirements.
a) The nominal load of the windlass and winch is recommended to be not less than one third of the
minimum breaking load of the chain or wire rope. The nominal load of the anchor gear connected
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ISO 9089:2019(E)
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by a combination of the chain and wire rope shall be not less than one third of the breaking load of
either design anchor or rope, whichever is the lesser.b) The windlass and winch operating under nominal load shall be free from abnormal vibration or
noise; the hydraulic system shall act flexibly and reliably without oil seepage or leakage; the cable‐
lifter shall engage the chains well without chain jumping.c) The windlass and winch shall stop immediately during the emergency stop.
5.4 Nominal speed
The nominal speed shall be agreed upon between the manufacturer and the purchaser. If windlasses
and winches are required to be used for temporary mooring of windlass on sea trial, the nominal
hoisting speed shall be not less than 9 m/min.5.5 Stalling load
The windlass and winch shall be equipped with a torque limiter; the stalling load shall be not less than
40 % of the minimum breaking load of mooring chains or wire ropes, the windlass and winch shall have
the capacity of maintaining the stalling load before the braking system acts, without speed
requirements. The cable‐lifter or drum shall not slip under 40 % of the breaking load of the anchor line
and shall slip under 45 % of the breaking load of the anchor line. For winches, the stalling load shall be
designed to refer to the maximum allowable number of layers of ropes configured.5.6 Static braking
Each cable‐lifter (drum) shall be fitted with two separate static braking systems, the static brake load of
each system shall be sufficient to withstand at least 0,5 times the breaking load of the anchor line. For
the winch, the brake capacity shall be designed to refer to the maximum allowable number of layers of
ropes configured.For each braking system under a braking condition, there shall be no slip of cable‐lifter or drum or
permanent deformation of the cable‐lifter/drum, shaft, braking system and foundation bracket.
The operation of the power operating system of the braking system shall not be affected by a failure of
the primary power source. The emergency release system of the braking system shall be provided with
an emergency power source.Ratchet and pawl mechanisms are not considered as static brakes.
5.7 Automatic braking
5.7.1 The motor‐driven windlass and winch shall be provided with an automatic braking system. For
the hydraulic motor‐driven windlass and winch, the setup of an automatic braking system shall be
agreed upon between the manufacturer and the purchaser.5.7.2 An automatic braking system shall meet the following requirements.
a) The static braking force of the prime mover braking system shall be capable of holding the torque
induced by the line pull force at 0,5 times the breaking load of the anchor line.
b) The braking system shall be capable of automatic braking instantly when the control handle is in
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ISO 9089:2019(E)
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c) Braking shall be reliable, without the cable‐lifter or drum slip and without any permanent
deformation of the cable‐lifter/drum, shaft, braking system and foundation bracket. If the
hydraulically‐driven windlass and winch without automatic braking system achieves the function
only with a balanced valve, the anchor line slippage shall be not more than 1 m/min under the load.
5.8 Emergency release5.8.1 The windlass/winch shall be able to carry out an emergency release of the anchor line within
10s when the platform is under mooring conditions.5.8.2 The operation of an emergency release shall meet the following requirements.
a) It shall be possible to limit the speed of the released anchor line and to apply and release one of the
brakes, at least once, during the emergency release.b) The emergency release operating device shall be installed next to the windlass and winch, or chain
or wire rope stopper, as well as within the safety zone of the central console (if equipped with a
central console). After the emergency release, the braking system shall be capable of restoring its
normal functions instantly. At all control places, the operation of the same controller shall realize
the emergency release. The winch prime mover shall not re‐operate automatically after an
emergency release. The control handles and buttons for emergency release shall be provided with
protections to avoid misoperation.5.8.3 If the platform is fitted with a riser disconnecting system, when the riser is still connected to the
platform, the anchor line shall not be released; the protection is provided to prevent misoperation
resulting in an emergency release, but after the safety protection is removed manually, the riser at a
connected state may still achieve the function of emergency release.5.8.4 Electrical equipment for emergency release mechanism, if located in the hazardous zone, shall
be certified safe type. The cooling water system where required shall be provided to effectively prevent
any sparks due to emergency release of the anchor line. The system shall be kept pressurized and
arranged for auto starting of the pump to ensure immediate availability of cooling water supply.
5.9 Anchor deployment (anchor dropping) speed limitationEach windlass and winch shall be equipped with a set of anchor deployment (anchor dropping)
dynamic brakes and have the sufficient capacity of anchor deployment (anchor dropping) speed
limitation, to control the dynamic load due to anchor deployment, continuously pay out anchor lines,
and result in no damage or overheat during anchor deployment (anchor dropping). The speed of the
anchor deployment should not exceed 2,5 m/s.5.10 Anchor line length, speed and tension measurement
5.10.1 The windlass and winch shall be equipped with means to measure the length and speed of each
anchor line.5.10.2 The windlass and winch shall be fitted with two sets of tension measuring devices which have
been subjected to calibration. The minimum measurement accuracy of the anchor line tension
measuring device shall not exceed 5 % of the entire range. Unless otherwise specified, the range of the
tension measuring device shall satisfy 10 %‐70 % of the breaking load of the anchor line.
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5.11 Chain or wire rope stoppers
The windlass and winch may be fitted with chain or wire rope stoppers, as necessary.
a) The chain or wire rope stopper shall be capable of withstanding the static load equal to the
breaking load of the chain or wire rope.b) After the operation of an emergency release, the chain or wire rope stopper shall be capable of
emergency release.c) The chain or wire rope stopper shall stop the anchor line at all times without chain or wire rope
slip, and without any permanent deformation of the chain or wire rope stoppers and brackets.
5.12 Ratchet mechanismsThe cable‐lifter or drum may be fitted with a ratchet mechanism, as necessary, wh
...INTERNATIONAL ISO
STANDARD 9089
Second edition
2019-07
Marine structures — Mobile offshore
units — Mooring positioning
windlasses and winches
Structures maritimes — Unités mobiles au large — Treuils d'ancrage
Reference number
ISO 9089:2019(E)
ISO 2019
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ISO 9089:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
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ISO 9089:2019(E)
Contents Page
Foreword ..........................................................................................................................................................................................................................................v
1 Scope ................................................................................................................................................................................................................................. 1
2 Normative references ...................................................................................................................................................................................... 1
3 Terms and definitions ..................................................................................................................................................................................... 1
4 Classification of mooring positioning windlasses and winches .......................................................................... 3
5 Functional and operational requirements ................................................................................................................................ 3
5.1 General ........................................................................................................................................................................................................... 3
5.2 No-load .......................................................................................................................................................................................................... 3
5.3 Nominal load ............................................................................................................................................................................................. 3
5.4 Nominal speed ......................................................................................................................................................................................... 3
5.5 Stalling load ............................................................................................................................................................................................... 3
5.6 Static braking ............................................................................................................................................................................................ 4
5.7 Automatic braking ................................................................................................................................................................................ 4
5.8 Emergency release ............................................................................................................................................................................... 4
5.9 Anchor deployment (anchor dropping) speed limitation ................................................................................. 5
5.10 Anchor line length, speed and tension measurement ........................................................................................... 5
5.11 Chain or wire rope stoppers ........................................................................................................................................................ 5
5.12 Ratchet mechanisms .......................................................................................................................................................................... 5
5.13 Operating system .................................................................................................................................................................................. 5
6 Design and construction ............................................................................................................................................................................... 6
6.1 General ........................................................................................................................................................................................................... 6
6.2 Mooring anchor lines ......................................................................................................................................................................... 6
6.3 Cable-lifters ................................................................................................................................................................................................ 6
6.4 Drums ............................................................................................................................................................................................................. 7
6.5 Friction winch drums ........................................................................................................................................................................ 7
6.6 Warping ends ........................................................................................................................................................................................... 7
6.7 Anchor line guides ............................................................................................................................................................................... 7
6.8 Gears ................................................................................................................................................................................................................ 8
6.9 Drive equipment .................................................................................................................................................................................... 9
6.10 Strength requirements ..................................................................................................................................................................... 9
7 Test methods ............................................................................................................................................................................................................. 9
7.1 General ........................................................................................................................................................................................................... 9
7.2 Test conditions .....................................................................................................................................................................................10
7.3 No-load test .............................................................................................................................................................................................10
7.4 Nominal load test ...............................................................................................................................................................................10
7.5 Nominal speed test ...........................................................................................................................................................................10
7.6 Stalling load ............................................................................................................................................................................................10
7.7 Static braking load ............................................................................................................................................................................10
7.8 Automatic braking .............................................................................................................................................................................10
7.9 Anchor deployment (anchor dropping) speed limitation ..............................................................................10
7.10 Length, speed and tension calibration .............................................................................................................................11
7.11 Chain or wire rope stoppers .....................................................................................................................................................11
7.12 Ratchet mechanisms .......................................................................................................................................................................11
7.13 Operating systems .............................................................................................................................................................................11
8 Designation .............................................................................................................................................................................................................11
8.1 Nominal sizes ........................................................................................................................................................................................11
8.2 Labelling ....................................................................................................................................................................................................11
8.2.1 Model designation .......................................................................................................................................................11
8.2.2 Example ................................................................................................................................................................................12
9 Marking .......................................................................................................................................................................................................................12
10 Documentation ....................................................................................................................................................................................................12
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ISO 9089:2019(E)
10.1 Workshop certificate .......................................................................................................................................................................12
10.2 Instructions for use and maintenance .............................................................................................................................12
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ISO 9089:2019(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso
.org/iso/foreword .html.This document was prepared by Technical Committee 8, Ships and marine technology, Subcommittee 4,
Outfitting and deck machinery.This second edition cancels and replaces the first edition (ISO 9089:1985), which has been technically
revised.The main changes compared to the previous edition are as follows:
— Added no-load, nominal load, nominal speed, stalling/slipping load, anchor deployment (anchor
dropping) speed limitation, anchor line length, speed and tension measurement, cable/wire rope
stopper, ratchet mechanisms, etc. to the functional and operational requirements.
— Refined all sub-items in design and construction, and quantified the requirements of all indicators
and formula.— Provided an overview of various tests, and specified test types, methods and requirements.
— Provided check items, sequence, qualification criteria for type inspection of mooring positioning
windlass and winches.Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.© ISO 2019 – All rights reserved v
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INTERNATIONAL STANDARD ISO 9089:2019(E)
Marine structures — Mobile offshore units — Mooring
positioning windlasses and winches
1 Scope
This document specifies a classification, technical requirements and test methods, as well as designation,
marking and documentation requirements for mooring positioning windlasses and winches of mobile
offshore floating units, including drill-ships, semi-submersible drilling rigs, production platforms and
offshore accommodation platforms.It can be used as a reference for ship-shifting positioning winches of pipelaying, crane and pile-driving
vessels.This document is applicable to the design, manufacturing and acceptance testing of mooring positioning
windlasses and winches.2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 1704, Ships and marine technology — Stud-link anchor chainsISO 1968, Fibre ropes and cordage — Vocabulary
ISO 3108, Steel wire ropes — Test method — Determination of measured breaking force
ISO 3730, Shipbuilding and marine structures — Mooring winchesISO 3828, Shipbuilding and marine structures —Deck machinery — Vocabulary and symbols
ISO 6336, Calculation of load capacity of spur and helical gearsISO 6482, Shipbuilding — Deck machinery — Warping end profiles
ISO 7825:2017, Shipbuilding — Deck machinery — General requirements
ISO 9083, Calculation of load capacity of spur and helical gears — Application to marine gears
ISO 17893, Steel wire ropes — Vocabulary, designation and classificationISO 18692, Fibre ropes for offshore stationkeeping — Polyester
IEC 60092, Electrical installations in ships
IEC 61892, Mobile and fixed offshore units — Electrical installations
API Spec 2F, Specification for mooring chain
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 3828 and the following apply.
© ISO 2019 – All rights reserved 1---------------------- Page: 6 ----------------------
ISO 9089:2019(E)
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http: //www .electropedia .org/— ISO Online browsing platform: available at https: //www .iso .org/obp
3.1
mooring positioning windlass and winch
windlass and winch and associated electric control system used for mooring positioning of mobile
offshore floating units, including windlass and winch bodies (chain wheels/drums, drives, braking
systems, anchor deployment (anchor dropping) speed limiters, etc.), chain or wire rope stoppers,
anchor line guides and electric control system3.2 Right-hand (left hand) windlasses or winches
3.2.1
right-hand windlass or winch
windlass or winch where, in relation to an observer situated on the side of the prime mover, power
supply or controller, the drive for the cable-lifter or drum is on the right of the cable-lifter or drum
Note 1 to entry: See Figure 1.3.2.2
left-hand windlass or winch
windlass or winch where, in relation to an observer situated on the side of the prime mover, power
supply or controller, the drive for the cable-lifter or drum is on the left of the cable-lifter or drum
Note 1 to entry: See Figure 2.Figure 1 — Right-hand windlass or winch
Figure 2 — Left-hand windlass or winch
2 © ISO 2019 – All rights reserved
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ISO 9089:2019(E)
3.3
nominal load
maximum chain or rope tension that the windlass or winch is able to maintain continuously when
hauling at nominal speed, measured either at the cable-lifter exit, or at the rope exit of the first layer in
the case of a drum4 Classification of mooring positioning windlasses and winches
Mooring positioning windlasses and winches are divided into the following types according to functions
and structural types.— Type A — positioning windlass (positioning windlass with mooring chains).
— Type B — positioning winch (positioning winch with steel wire ropes).
— Type C — friction positioning windlass and winch (positioning winches with friction drum).
— Type D — positioning windlass and winch of combined mooring chains and steel wire ropes
(positioning windlass and winch capable of hauling in both mooring chains and steel wire ropes).
— Type E — hoisting positioning windlass driven by the cylinder.5 Functional and operational requirements
5.1 General
Windlass and winches shall meet the general requirements for mooring winches in ISO 3730.
5.2 No-loadThe windlass and winch operating under no-load at nominal speed shall be free from abnormal
vibration or noise; the hydraulic system shall act flexibly and reliably without oil seepage or leakage.
5.3 Nominal loadThe nominal load of the windlass and winch shall meet the following requirements.
a) The nominal load of the windlass and winch is recommended to be not less than one third of the
minimum breaking load of the chain or wire rope. The nominal load of the anchor gear connected
by a combination of the chain and wire rope shall be not less than one third of the breaking load of
either design anchor or rope, whichever is the lesser.b) The windlass and winch operating under nominal load shall be free from abnormal vibration or
noise; the hydraulic system shall act flexibly and reliably without oil seepage or leakage; the cable-
lifter shall engage the chains well without chain jumping.c) The windlass and winch shall stop immediately during the emergency stop.
5.4 Nominal speed
The nominal speed shall be agreed upon between the manufacturer and the purchaser. If windlasses
and winches are required to be used for temporary mooring of windlass on sea trial, the nominal
hoisting speed shall be not less than 9 m/min.5.5 Stalling load
The windlass and winch shall be equipped with a torque limiter; the stalling load shall be not less
than 40 % of the minimum breaking load of mooring chains or wire ropes, the windlass and winch
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ISO 9089:2019(E)
shall have the capacity of maintaining the stalling load before the braking system acts, without speed
requirements. The cable-lifter or drum shall not slip under 40 % of the break...
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