AD 2020-15-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Rolls-Royce plc | Various | Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG (Type Certificate Formerly Held by Rolls-Royce plc) Turbofan Engines |
Unsafe Condition
A review of operational flight data revealed that some RB211-524 engines may have been operated beyond the currently valid datum flight profile (FP) published in the applicable Aircraft Maintenance Manuals. The purpose of the datum FPs is to establish the operational limits (life limits) within which the corresponding critical parts are allowed to remain installed. In addition, as this FP exceedance was investigated, it was realised that the current life limits of certain P/N corresponding to reworked LPT Stage 1 discs (time since new, or since entry into service following rework) could no longer be supported. This condition, if not corrected, could lead to disc failure, possibly resulting in engine in-flight shut-down and high energy debris release, with consequent damage to, and reduced control of, the aeroplane.
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Required Actions
This AD requires removal from service of the affected parts. This AD also prohibits (re)installation of affected parts that have exceeded the new reduced limits. The FAA reviewed Rolls-Royce plc Alert Non-Modification Service Bulletin (NMSB) RB.211-72-AK422, Revision 1, dated March 2, 2020. The NMSB describes procedures for reducing the Declared Safe Cyclic Limit for LPT stage 1 disks. This service information is reasonably available because the interested parties have access to it through their normal course of business or by the means identified in the ADDRESSES section.
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Compliance Time
Within 25 flight cycles after the effective date of this AD, whichever occurs later.
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Affected Aircraft
Rolls-Royce Deutschland Ltd & Co KG RB211-524G2-19, RB211-524G2-T-19, RB211-524G3-19, RB211-524G3-T-19, RB211-524H2-19, RB211-524H2-T-19, RB211-524H-36 and RB211-524H-T-36 model turbofan engines.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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