AD 75-07-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce Corporation | 501-D22A | DETROIT DIESEL ALLISON Model 501-D22A Engines |
Unsafe Condition
Second stage turbine blades (part number 6852228) may fail due to high cycle fatigue, leading to engine failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove part number 6852228 second stage turbine blades and replace with part number 6890508 second stage turbine blades.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 300 hours' time in service after the effective date of this Airworthiness Directive
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Detroit Diesel Allison Model 501-D22A engines with turbine assemblies having the specified 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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