AD 2013-23-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Rolls-Royce | Deutschland Ltd & Co KG Turbofan | Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG Turbofan Engines |
Unsafe Condition
Excessive deterioration of the high-pressure (HP) air bleed valve operating mechanism, influencing the aerodynamic fan flutter margin, which could lead to multiple fan blade failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform a one-time inspection of the HP air bleed valve operating mechanism using RRD Alert Non-Modification Service Bulletin (NMSB) No. TAY-75-A1784, Revision 1. If the measured torque to open and close the valve exceeds specified values, take corrective action as outlined in the bulletin before next flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 1,500 flight cycles after the effective date of this AD.
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Affected Aircraft
All Rolls-Royce Deutschland Ltd & Co KG (RRD) model Tay 620-15, 650-15, and 651-54 turbofan engines.
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
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