Complex Electronic Hardware ATSOA/STCAirworthiness and Engineering Branch

History of DO-254• Certification authorities formed SC-180/WG-46• Formed from DO-178B• Previously only DO-160 applied to hardware• 5 levels criticality based on system safety ARP-4761

Application of DO-254

CAST-27 provide clarification and reduce certification effort

Thomas APMA

Previous CASA approvals for High Voltage Power Supply replacements

Qantas 747-400 CRT to LCD replacement program 2003

Saab 340B – Electronic Flight Instrument

• First type certified 1984 Swedish LFV

• Collins EFIS-86 subject to obsolescence

Collins EFIS-86 CRT replacement • Stratix IV GX FPGA• RTCA/DO-254 Level C• CMC electronics LCD Head assembly

Hazard identification – Level C

Hardware design life cycle milestones

Hardware planning process AC 21-50

Firmware development lifecycle

Requirements capture

Conceptual Design - System Topology

Conceptual design - Functional block diagram

FPGA functions

1. Process deflection signals2. Signal processing3. Vector/Raster conversion4. Enable backlight5. Memory reading/writing6. Clock signals7. LCD frames at 60Hz8. Synchronisation

Previously developed hardware

• Flash controller• PLL clock management• QDRII+ memory controller• DDR3 memory arbiter• Avalon system interconnect for calling memory

Previously developed tools

• Design tools• Quartus II 12.1 SP1 : Design Entry & implementation• Active-HDL 9.3 : Simulation• Alint 2012 : Code coverage

• Verification tools• ModelSim DE 10.3 : Simulation• Active-HDL 9.3 : Simulation• Alint 2012 : Code Coverage

RTCA/DO-160 Environmental qualification

CASA regulations

ATSOA is a manufacturing and design approval

ATSO21.O

STC21.E

FAA letter of design

approval

CASA issued approvals - 2015

STC ATSOA

Type acceptance certificates

Consider original certification basis

• EASA type certificate Issue Paper F1• F1 predated RTCA/DO-254• System safety assessment reassessed• In service data revealed no design related failures

Saab issued Service Bulletin

SB issued July 2019

Further reading

CASA AC 21-50FAA 20-174FAA AC 20-152FAA CAST 27FAA Order 8110.105A