AD 2012-06-14
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Pratt | & Whitney (PW)Turbofan | Airworthiness Directives; Pratt & Whitney (PW)Turbofan Engines |
Unsafe Condition
A new lower life limit of 9,000 cycles-since-new (CSN) for high-pressure turbine (HPT) 1st stage air seals, part number (P/N) 735907, is necessary to prevent critical life-limited rotating engine part failure and damage to the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove HPT 1st stage air seals, P/N 735907, from service using a drawdown schedule based on their CSN. Do not install or reinstall any removed air seals or those exceeding the new life limit of 9,000 CSN.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the compliance times specified in the AD, unless already done.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney JT9D-7R4G2 and -7R4H1 turbofan engines.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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