AD 88-26-51
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Canada Corp. | PW118 | PRATT & WHITNEY CANADA Models PW115/118/118A Engines |
| engine | Pratt & Whitney Canada Corp. | PW118A | PRATT & WHITNEY CANADA Models PW115/118/118A Engines |
| engine | Pratt & Whitney Canada Corp. | PW120 | PRATT & WHITNEY CANADA Models PW115/118/118A Engines |
| engine | Pratt & Whitney Canada Corp. | PW120A | PRATT & WHITNEY CANADA Models PW115/118/118A Engines |
| engine | Pratt & Whitney Canada Corp. | PW121 | PRATT & WHITNEY CANADA Models PW115/118/118A Engines |
Unsafe Condition
Uncontained engine failure resulting from low cycle fatigue failure of certain high pressure turbine (HPT) components.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Determine cyclic life accumulated on HPT front cover, HPT rear cover, and HPT disk per PWC SB 20002, Rev 4. Remove and replace HPT components within 25 cycles in service (CIS) from AD receipt if they have 14,975 CIS or more. Replace components at or before 15,000 CIS if they have less than 14,975 CIS upon receipt.
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Compliance Time
Required as indicated, unless already accomplished.
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Affected Aircraft
Pratt & Whitney Canada PW115/118/118A turboprop engines prior to Serial Number PCE 115033, and PW120/120A/121 turboprop engines prior to S/N PCE 120174.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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