ASTM F2355-05a
(Specification)Standard Specification for Design and Performance Requirements for Lighter-Than-Air Light Sport Aircraft
Standard Specification for Design and Performance Requirements for Lighter-Than-Air Light Sport Aircraft
SCOPE
1.1 This specification covers design and performance requirements that apply for the manufacture of lighter-than-air light sport aircraft.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory requirements prior to use.
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Standards Content (Sample)
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Designation: F 2355 – 05a
Standard Specification for
Design and Performance Requirements for Lighter-Than-Air
1
Light Sport Aircraft
This standard is issued under the fixed designation F 2355; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope designed maximum weight at which compliance with each
applicable structural loading condition is demonstrated, or (2)
1.1 This specification covers design and performance re-
the highest weight at which compliance at each applicable
quirements that apply for the manufacture of lighter-than-air
flight requirement is demonstrated.
light sport aircraft.
3.1.5 lighter-than-air aircraft—aircraft that can rise and
1.2 This standard does not purport to address all of the
remain suspended by using contained gas weighing less than
safety concerns, if any, associated with its use. It is the
the air that is displaced by the gas.
responsibility of the user of this standard to establish appro-
3.1.5.1 Discussion—Airships may include dynamic lift that
priate safety and health practices and determine the applica-
derive as much as 30 % lift from other than buoyancy.
bility of regulatory requirements prior to use.
3.1.6 maximum takeoff weight—gross weight limit as de-
2. Referenced Documents
fined by the manufacturer, proven through compliance with
2
this specification and placarded on the aircraft as the not-to-
2.1 ASTM Standards:
exceed gross weight.
F 2353 Specification for Manufacturer Quality Assurance
3.1.7 thermal airship—craft with design features to prevent
Program for Lighter-Than-Air Light Sport Aircraft
collapse due to forward motion for which buoyancy is created
F 2354 Specification for Continued Airworthiness System
or enhanced by heating of the gas in an otherwise unpressur-
for Lighter-Than-Air Light Sport Aircraft
ized envelope.
F 2356 Specification for Production Acceptance Testing
3.1.8 vectored thrust balloon—craft that can move laterally,
System for Lighter-Than-Air Light Sport Aircraft
but is limited to lateral speed by its lack of design features to
F 2427 Specification for Required Product Information to
prevent collapse due to forward motion.
be Provided with Lighter-than-Air Light Sport Aircraft
3.1.9 weight limitations—operational weight restrictions
3. Terminology
(maximum/minimum) as defined by the manufacturer and
proven through compliance with this specification to demon-
3.1 Definitions:
strate controllability.
3.1.1 airship—engine-driven lighter-than-air aircraft that
can be steered, and that sustains flight through the use of either
4. Flight Requirements
gas buoyancy or an airborne heater, or both.
4.1 Performance Requirements for Airships and Thermal
3.1.2 balloon—lighter-than-air aircraft that is not engine-
Airships, except as noted:
driven, and that sustains flight through the use of either gas
4.1.1 Proof of Compliance—Each of the following require-
buoyancy or an airborne heater, or both.
ments shall be met at the maximum takeoff weight and most
3.1.3 design useful load—load (other than structure, engine,
critical center of gravity (CG) position. To the extent that CG
enclosure,andsystems)thatalighter-than-airaircraftcancarry
adjustment devices may be adjusted for flight, these compo-
while achieving the design defining performance requirements.
nents will be evaluated in the least favorable recommended
3.1.4 gross weight—total aircraft system weight(s) at take-
position as it affects either performance or structural strength.
off. The weight limits must be established so that it is: (1) the
4.1.2 General Performance—Allperformancerequirements
apply in and shall be corrected to International Civil Aviation
1
This specification is under the jurisdiction of ASTM Committee F37 on Light
Organization (ICAO) defined standard atmosphere in still air
Sport Aircraft and is the direct responsibility of Subcommittee F37.60 on Lighter
conditionsatsealevel.Speedsshallbegiveninindicated(IAS)
Than Air.
and calibrated (CAS) airspeeds in knots.
Current edition approved Nov. 1, 2005. Published November 2005. Originally
approved in 2005. Last previous edition approved in 2005 as F 2355 – 05.
4.1.3 Flight Performance—For all flight operations it shall
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
be shown that control sufficient to safely maneuver or land the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
airship, or both, can be maintained.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 4.1.4 Climb—The following shall be measured:
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