AD 2003-21-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce | plc RB211-524 Series | Airworthiness Directives; Rolls-Royce plc RB211-524 Series Turbofan Engines |
Unsafe Condition
Dedicated generator rotor assembly bearing failures due to low fatigue life of the bearing material and inadequate bearing lubrication, leading to erratic high pressure (HP) shaft speed signal sent to the Full Authority Fuel Controller (FAFC), which can cause possible uncommanded engine acceleration with no reaction to throttle movement, resulting in uncontrollable asymmetric engine thrust levels during takeoff or climb.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the dedicated generator rotor assembly, part number (P/N) UL39102, the adaptor casing P/N UL26756 or UL26729 on the high speed gearbox (HSGB), and bearings P/N UL21029 with new design parts.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 62 months after the effective date of the AD for RB211-524G2-19, RB211-524G2-T-19, RB211-524G3-19, RB211-524G3-T-19, RB211-524H2-19, RB211-524H2-T-19 engines; within 16 months after the effective date of the AD for SN RB211-524H-36, RB211-524H-T-36 engines.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Rolls-Royce plc RB211-524 series turbofan engines, including RB211-524G2-19, RB211-524G3-19, RB211-H2-19, RB211-524H-36, RB211-524G2-T-19, RB211-524G3-T-19, RB211-524H2-T-19, and RB211-524H-T-36 turbofan engines, with specific serial number ranges as detailed in the AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.