Airworthiness Directive · Amendment 39-21170 · Turbine section
Rolls-Royce Deutschland Ltd & Co KG (Type Certificate Formerly Held by Rolls-Royce plc) Turbofan Engines
Superseded. A later AD replaced this one: AD 2023-22-01. Comply with the one in force.
This AD applies to Rolls-Royce Deutschland Ltd & Co KG (type certificate formerly held by Rolls-Royce plc) 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 with low-pressure turbine (LPT) stage 1 disks, part number (P/N) UL37606, UL37607, UL37608, UL37722 or UL37790, installed.
The FAA is adopting a new airworthiness directive (AD) for certain 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. This AD requires replacement of the low-pressure turbine (LPT) stage 1 disk before it reaches its new Declared Safe Cycle Limit (DSCL) or within 25 flight cycles after the effective date of this AD, whichever occurs later. This AD was prompted by a determination by the manufacturer that the affected LPT stage 1 disks cannot operate until their former published life limit. The FAA is issuing this AD to address the unsafe condition on these products.
Before the LPT stage 1 disk reaches its Declared Safe Cycle Limit (DSCL) as specified in the Accomplishment Instructions, Paragraph 3., Tables 1 through 9, in Rolls-Royce plc Alert Non-Modification Service Bulletin (NMSB) RB.211-72-AK422, Revision 1, dated March 2, 2020, or within 25 flight cycles after the effective date of this AD, whichever occurs later, remove the LPT stage 1 disk from service and replace with a part eligible for installation.
For the purpose of this AD, a part eligible for installation is any LPT stage 1 disk that is new or has not reached its DSCL as specified in the Accomplishment Instructions, Paragraph 3., Tables 1 through 9, in the Rolls-Royce Alert NMSB RB.211-72-AK422, Revision 1, dated March 2, 2020.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Engines
