AD 2007-04-26
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | PW4077D | Airworthiness Directives; Pratt & Whitney PW4077D, PW4084D, PW4090, and PW4090-3 Turbofan Engines |
Unsafe Condition
Engines reassembled with previously used high pressure compressor (HPC) exit brush seal packs and new or refurbished HPC exit diffuser air seal lands may experience uncontained engine failure, damage to the airplane, and injury to passengers.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the HPC exit inner and outer brush seal packs with new brush seal packs, using either original equipment manufactured (OEM) parts or FAA-approved part manufacturer approval (PMA) parts. This AD also applies to engines reassembled with PMA HPC exit inner and/or outer brush seal packs.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney PW4077D, PW4084D, PW4090, and PW4090-3 turbofan engines reassembled with previously used HPC exit brush seal packs and new or refurbished HPC exit diffuser air seal lands, or with PMA HPC exit inner and/or outer brush seal packs.
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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