F39.03 - Design of Avionics Systems

ABSTRACT
This specification describes a process for verifying the intended function and compliance with safety objectives of avionics systems by means of system-level testing. This verification process includes functional verification planning, testing, resolution of test failures, and regression analysis and testing. It also covers organizational requirements and the process of product definition (function identification, classification, and specification) as well as the requirements for producing a statement of verification.
SCOPE
1.1 This specification provides a process for performing system level verification of aircraft systems and equipment. It provides a means of compliance that can be used for systems and equipment with software and Airborne Electronic Hardware (AEH) that have not been addressed by traditional development assurance methods.  
1.2 This process can be used to show compliance to regulations that require a demonstration that functionality was implemented as intended, including safety mitigations that address failure conditions for software and AEH aspects for aircraft systems and equipment.  
1.3 While this specification was developed with systems and equipment installed on aircraft certification level 1 and 2 (or class I and II in accordance with Advisory Circular (AC) 23.1309-1) normal category aeroplanes in mind, the content may be more broadly applicable. It is the responsibility of the Applicant to substantiate broader applicability as a specific means of compliance and obtain concurrence for its use from the applicable Civil Aviation Authority (CAA).  
1.4 When using this specification, regulations that govern system safety requirements applicable to the aircraft still apply. In complying with those regulations, additional architectural mitigations such as redundancy, independence, separation, system monitors, etc., may be required in addition to the verification process specified in this specification.  
1.5 The system level verification activities expected by this specification increase as the severity of the failure conditions applicable to or affected by the function increase. Those functions, which have hazardous and catastrophic failure conditions, receive additional activities through this process to provide detailed scrutiny. For normal category aircraft, refer to Practice F3309, Practice F3230, or AC 23.1309-1 for more information on the identification and classification of system failure conditions. Involvement of the applicable CAA personnel or their designees in this system verification process should be discussed early in the project.  
1.6 This verification process specifically addresses definition, identification, and verification of system functions. Processes conducted under this specification may not satisfy all applicable external requirements; additional review on the part of the system developer, integrator, or installer may be required to meet specific requirements or the specified mission of the aircraft, or both.  
1.7 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard.  
1.8 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.9 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

ABSTRACT
This specification establishes functional operation and minimum performance requirements for simple systems that provide angle-of-attack information to a pilot, aircraft, or other systems. Functional requirements cover basic operation, stall indication, startup of electronically driven systems, accessibility of controls, and software while environmental requirements include icing, deicing fluids, emissions of RF energy, electrical power input, and power input abnormal surge voltage.
SCOPE
1.1 This performance specification covers simple systems that provide angle-of-attack information to a pilot, aircraft, or other systems.
Note 1: More complex AoA systems can be addressed in annexes in the future.  
1.2 In this performance specification, functional operation and minimum performance requirements for an angle-of-attack system are established.  
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

ABSTRACT
This specification describes a process for verifying the intended function and compliance with safety objectives of avionics systems by means of system-level testing. This verification process includes functional verification planning, testing, resolution of test failures, and regression analysis and testing. It also covers organizational requirements and the process of product definition (function identification, classification, and specification) as well as the requirements for producing a statement of verification.
SCOPE
1.1 This specification provides a process by which the intended function and compliance with safety objectives of avionics systems may be verified by system-level testing.  
1.2 Software and hardware development assurance are not in the scope of this specification and this specification should not be used if a development assurance process is required.  
1.3 The specification intentionally does not attempt to define its own applicability with regard to the type, category, class of aircraft, or criticality of function to which avionics systems verified by the specification may be applied as doing so could ultimately place the language of the specification in conflict with external requirements and guidance. Aircraft applicability, intended use, and limitations must ultimately be determined by the designer, installer, and recognizing body.  
1.4 This verification process specifically addresses definition, identification, and verification of system functions. Processes conducted under this specification may not satisfy all applicable external requirements; additional review on the part of the system developer, integrator, or installer may be required to meet specific requirements or the specified mission of the aircraft, or both.  
1.5 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 limitations prior to use.

ABSTRACT
This specification establishes functional operation and minimum performance requirements for simple systems that provide angle-of-attack information to a pilot, aircraft, or other systems. Functional requirements cover basic operation, stall indication, startup of electronically driven systems, accessibility of controls, and software while environmental requirements include icing, deicing fluids, emissions of RF energy, electrical power input, and power input abnormal surge voltage.
SCOPE
1.1 This performance specification covers simple systems that provide angle-of-attack information to a pilot, aircraft, or other systems.Note 1—More complex AoA systems can be addressed in annexes in the future.  
1.2 In this performance specification, functional operation and minimum performance requirements for an angle-of-attack system are established.  
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.4 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 limitations prior to use.