Post on 31-Mar-2015
Presented to:
By:
Date:
Federal AviationAdministrationComplex Electronic
Hardware Policy & Guidance
Software & Complex Electronic Hardware Standardization Conference
John Lewis, AIR-120, Technical Programs Branch, Washington DC
Email: john.lewis@faa.gov, (202) 493-4841
July 26, 2005
2Federal AviationAdministrationJuly 26, 2005
Software & Complex Electronic Hardware Conference
Presentation Overview
• AC 20-152, Design Assurance Guidance for Airborne Electronic Hardware, RTCA/DO-254
• Policy Memo for RTCA/DO-254• RTCA/DO-254 training course• Authorization of DERs for complex electronic
hardware (CEH)
3Federal AviationAdministrationJuly 26, 2005
Software & Complex Electronic Hardware Conference
AC 20-152, Design Assurance Guidance for Airborne Electronic Hardware, RTCA/DO-254
• What is the background with developing and recognizing RTCA/DO-254?– RTCA SC-180 lasted 7 years and held 25+
meetings.– RTCA/DO-254 published April 19, 2000.– FAA recognition of DO-254 for programmable logic
devices (PLDs) via issue papers.– FAA published AC 20-152 on June 30, 2005.– Process took 12 years!
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Software & Complex Electronic Hardware Conference
AC 20-152, Design Assurance Guidance for Airborne Electronic Hardware, RTCA/DO-254
• Why did it take so long to publish and recognize RTCA/DO-254?– Scope problems: What is complex hardware?
(LRUs, circuit board assemblies, custom micro-coded components, COTS, etc.)
– Hardware design assurance levels.– Unofficial disagreement by industry on release of
RTCA/DO-254.
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Software & Complex Electronic Hardware Conference
AC 20-152, Design Assurance Guidance for Airborne Electronic Hardware, RTCA/DO-254
• What types of complex electronic hardware are covered by the AC 20-152?– Complex custom micro-coded components:
• Programmable logic devices (PLDs)• Field programmable gate arrays (FPGAs)• Application specific integrated circuit (ASICs)• Other similar electronic devices
6Federal AviationAdministrationJuly 26, 2005
Software & Complex Electronic Hardware Conference
AC 20-152, Design Assurance Guidance for Airborne Electronic Hardware, RTCA/DO-254
• What design assurance levels does AC 20-152 recognize for RTCA/DO-254?– Complex devices supporting Level A, B, & C
functions.– For Level D devices, applicants can use:
• If RTCA/DO-254 is used, then FAA review of lifecycle data is not necessary.
• Existing manufacturing design assurance practices (contingent on ACO agreement).
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Software & Complex Electronic Hardware Conference
AC 20-152, Design Assurance Guidance for Airborne Electronic Hardware, RTCA/DO-254
• What about microprocessors?– Recognize alternate methods to ensure COTS
microprocessors perform intended functions.– RTCA/DO-254 may be used for custom developed
microprocessors.– Lack of guidance for to address advance design
features (cache, pipelining, extra micro-coded instructions, etc.) in COTS microprocessors.
– Ongoing FAA/AVSI (Aviation Vehicle Systems Institute) research project for COTS microprocessors.
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Software & Complex Electronic Hardware Conference
Policy Memo/Order for using RTCA/DO-254
• How is the FAA going to harmonize with EASA for guidance on DO-254/ED-80?– Draft CAST paper P#86, Clarifications on the use of
RTCA/DO-254, Design Assurance Guidance for Airborne Electronic Hardware.
– FAA & EASA intend to publish equivalent guidance material.
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Software & Complex Electronic Hardware Conference
Policy Memo/Order for using RTCA/DO-254
• How is the FAA going to clarify the technical issues when using DO-254?– Draft policy memo addresses the following technical
issues:• Modifiable devices, verification & validation
processes, traceability, configuration management, etc.
– Schedule for release of policy memo by September, 2006.
– Plan to incorporate policy memo into FAA Order.
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Software & Complex Electronic Hardware Conference
Training for RTCA/DO-254
• What about new training for complex electronic hardware and RTCA/DO-254?– Proposed FY06 business plan nomination to develop
FAA course for RTCA/DO-254 (similar to DO-178B course for software).
– Course development contingent on budget resources.
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Software & Complex Electronic Hardware Conference
Authorization of DERs for CEH
• What about authorization of DERs in the complex electronic hardware (CEH) technical area?– Point of contact is Kevin Kendall, AIR-140.– Draft policy memo under coordination to address
• Qualifications • Limitations • TSO approval of CEH
– Policy Memo will be incorporated in future revisions to Order 8150.1B, Order 8110.37, and Order 8100.8.
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Software & Complex Electronic Hardware Conference
Authorization of DERs for CEH
• What about some specific qualifications under consideration for CEH?– Thorough working knowledge and understanding
of RTCA/DO-254.– Understanding of and experience with DO-254
hardware life cycle processes and data required for certification.
– Experience with different kinds of CEH design, such as Application Specific Integrated Circuits (ASIC), Programmable Logic Devices (PLD), and Field Programmable Gate Arrays (FPGA) design.
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Software & Complex Electronic Hardware Conference
Authorization of DERs for CEH
– Familiarity with Hardware Description Languages that are used for programming CEH, and an understanding of the types of verification required for use of such languages .
– Experience with complex electronic hardware verification process activities, including reviews, analyses, and testing.
– Familiarity with complex electronic hardware modification processes, including determination of change impact analyses, regression analyses and testing.
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Software & Complex Electronic Hardware Conference
Authorization of DERs for CEH
• What are some delegation limitations under consideration for CEH?– Approval of the Plan for Hardware Aspects of
Certification (PHAC), Top Level Drawing, and the Hardware Accomplishment Summary (HAS) will be reserved for approval by the ACO.
– For some systems and complex electronic hardware requiring design assurance Level A or B, the verification and validation data may also be reserved for approval by the ACO.
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Software & Complex Electronic Hardware Conference
Special thanks to national FAA team members!
• FAA team for AC 20-152:– Transport Airplane Directorate: Gregg Bartley, Will
Struck, & Varun Khanna– Rotorcraft Directorate: Jorge Castillo– Engine Directorate: Gary Horan– Small Airplane Directorate: Robin Sova & Wes Ryan– Chicago ACO: Brenda Ocker– Los Angeles ACO: Tom Phan– Wichita ACO: Gerry Pilj & Ruth Hirt
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Software & Complex Electronic Hardware Conference
Questions?
Comments to:John.Lewis@faa.gov
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