Airworthiness directives › 2020-15-07
AD 2020-15-07 Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG (Type Certificate Formerly Held by Rolls-Royce plc) Turbofan Engines
Applicability*9
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.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
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.
Unsafe condition
This AD was prompted by a determination by the manufacturer that the current published life limits established for certain part and serial numbered LPT stage 1 disks that have undergone rework could no longer be supported. The FAA is issuing this AD to prevent failure of the LPT stage 1 disk. The unsafe condition, if not addressed, could result in uncontained release of high-energy debris from the engine, in-flight shutdown of the engine, damage to the engine, and damage to the airplane.
Affected ADs
None.
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