AD 81-13-12 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce Corporation | 250-C30 | DETROIT DIESEL ALLISON Model 250-C30, -C30P, and C30S Engines |
| engine | Rolls-Royce Corporation | 250-C30P | DETROIT DIESEL ALLISON Model 250-C30, -C30P, and C30S Engines |
| engine | Rolls-Royce Corporation | 250-C30S | DETROIT DIESEL ALLISON Model 250-C30, -C30P, and C30S Engines |
Unsafe Condition
Cracks in P/N 6898694 4th stage turbine wheel nozzles leading to uncontained turbine wheel failures.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect, reduce life limits where applicable based on inspection results, and remove from service affected P/N 6898694 nozzles in compliance with Detroit Diesel Allison Commercial Engine Alert Bulletin CEB-A-72-3056, Revision 3 dated March 30, 1983, or later FAA approved revisions. Special flight permits may be issued under FAR's 21.197 and 21.199 to operate aircraft to a base where compliance can be accomplished. Equivalent means of compliance may be approved by the Manager, Chicago Aircraft Certification Office.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
as indicated unless already accomplished
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
DETROIT DIESEL ALLISON Model 250-C30, -C30P, and C30S engines equipped with 4th stage turbine nozzle assembly P/N 6898694, except specific engine and turbine serial numbers listed in the AD.
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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