AD 2005-05-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce | plc Models RB211 Trent 768-60 | Airworthiness Directives; Rolls-Royce plc Models RB211 Trent 768-60, Trent 772-60, and Trent 772B-60 Turbofan Engines |
Unsafe Condition
Possible dual-engine in-flight surge, which could result in dual engine power loss.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install updated software for the engine electronic controllers (EECs) to increase the in-flight N3 low idle schedule and maximize HP compressor surge margin. Perform initial and repetitive surge margin testing of engines. Install a stage 1 HP compressor casing and intermediate case outer location ring with wear-resistant coating. These installations are considered terminating actions to the repetitive surge margin testing.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 12 months of effective date
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Rolls-Royce plc Models RB211 Trent 768-60, Trent 772-60, and Trent 772B-60 Turbofan Engines
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.