AD 2004-14-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Allison | Engine Company | Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) Models 250-C28, -C28B, and -C28C Turboshaft Engines |
Unsafe Condition
High cycle fatigue causing failure of third-stage turbine blades and shrouds on certain third-stage turbine wheels, part number 6899383, with specific serial numbers.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace third-stage turbine wheels, part number 6899383, with the listed serial numbers before reaching new reduced life limits. For turbine wheels with fewer than 250 operating hours TSN on the effective date, replacement is required before accumulating 300 operating hours TSN. For turbine wheels with 250 or more operating hours TSN on the effective date, replacement is required before accumulating an additional 50 operating hours.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before reaching new reduced life limits, as specified in the AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Rolls-Royce Corporation (formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) models 250-C28, -C28B, and -C28C turboshaft engines with third-stage turbine wheels, part number 6899383, listed by specific serial numbers in Table 1 of the AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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