Engine Fuel and Control — Electronic Engine Control (EEC) Software — Deficiency to Detect and Protect against Large Engine Bleed Duct Leak
- Published
- Effective
- Replaces
- 2024-30
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must amend the Master Airplane Flight Manual to include new caution procedures within 90 days of the previous AD's effective date if not already done. They must update the engine EEC software to version 2.12.1 on both engines within 18 months of the effective date of AD CF-2025-12. After the software update, the manual procedure amendments are no longer required.
Summary
Airworthiness Directive CF-2025-12 is issued by Transport Canada and addresses a deficiency in the Electronic Engine Control (EEC) software for Pratt & Whitney PW1500G engines on Airbus Canada Limited Partnership BD-500-1A10 and BD-500-1A11 aircraft. The directive mandates updates to the engine EEC software to improve detection and protection against large engine bleed duct leaks that could lead to dual engine failure. It applies to specific serial numbers of these aircraft models.
What changed
This directive supersedes AD CF-2024-30 and requires the installation of EEC software update version 2.12.1 on both engines to automatically detect and isolate large bleed duct leaks. It maintains the previous requirement for flight crew procedures in the Master Airplane Flight Manual until the software update is installed. The software update is a terminating action for the manual procedures mandated by the earlier AD.
Why it matters
This directive enhances safety by addressing a critical software deficiency that could cause dual engine failure due to undetected large bleed duct leaks. For operators and maintenance teams, compliance ensures improved engine protection and reduces reliance on manual flight crew actions during such events. It also streamlines compliance by terminating previous manual procedure requirements once the software update is installed.
More for Airbus BD-500 (A220 Series)
All 123- EASA AD CF-2026-49Engine Controls – Throttle Quadrant Assembly – Throttle Lever Jamming - ReplacementOct 12, 2026
- EASA PAD 26-112Fuselage – Mid Avionics Bay – ModificationSep 23, 2026
- EASA AD CF-2026-45Wings – Discrepant Fasteners at Wing to Fuselage Joint - AmendmentSep 11, 2026
- EASA AD CF-2026-40Time Limits/Maintenance Checks – New and Revised Airworthiness Limitations TasksSep 2, 2026
- EASA AD CF-2026-36Fuselage – Skin Assembly – Discrepant Fasteners at Air Data System Probe Doubler - Replacement
Get the next one by email
New ADs and bulletins for Airbus BD-500 (A220 Series), summarized like this page, every Monday.