Airworthiness Directive 2003-21-11
one-timeAirworthiness Directives; Rolls-Royce plc RB211-524 Series Turbofan Engines
What this AD requires
The FAA is adopting a new airworthiness directive (AD) for certain Rolls-Royce plc (RR) RB211-524 series turbofan engines. This AD requires replacing the dedicated generator rotor assembly, the adaptor casing on the high speed gearbox (HSGB), and bearings with new design parts on certain engines. This AD is prompted by several reports of dedicated generator rotor assembly bearing failures. We are issuing this AD to prevent possible uncommanded engine acceleration with no reaction to throttle movement, which could result in uncontrollable asymmetric engine thrust levels during takeoff or climb.
Which aircraft AD 2003-21-11 applies to
Applies only to engines with dedicated generator rotor assembly P/N UL39102, adaptor casing P/N UL26756 or UL26729, and bearings P/N UL21029 installed on the high-speed gearbox (HSGB). Per AD Table 1, RB211-524G2-19, RB211-524G3-19, and RB211-524H2-19 apply to serial numbers before SN 13793; RB211-524H-36 applies to serial numbers before SN 13472; the -T-19 and -T-36 variants apply to all serial numbers. Installed on, but not limited to, Boeing 747 and 767 series airplanes.
Whether AD 2003-21-11 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.
How AD compliance is recorded
A valid compliance record (14 CFR 43.9) states:
Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.
Look up a tail number →Read the full directive (Federal Register)Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.