AD 2001-04-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | JT9D Series | Airworthiness Directives; Pratt & Whitney JT9D Series Turbofan Engines |
Unsafe Condition
Cracks in the web of one cooling air hole on a 1st stage high pressure turbine (HPT) disk, which could lead to 1st stage HPT disk cracking and result in an uncontained engine failure and damage to the aircraft.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform initial detailed eddy current inspections (ECI) for cracks in 1st stage HPT disks, with compliance times based on cycles-in-service (CIS) or cycles-since-new (CSN). Replace cracked disks with serviceable parts prior to further flight. Conduct repetitive ECIs at intervals not exceeding 6,000 CIS since the last ECI.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Varies based on cycles-since-new (CSN) or cycles-in-service (CIS) as detailed in the AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney JT9D-7R4D, -7R4D1, -7R4E, -7R4E1 (AI-500), -7, -7A, -7AH, -7H, -7F, and -20 series turbofan engines, installed on but not limited to Boeing 747 and 767 series, McDonnell Douglas DC-10 series, and Airbus Industrie A310 series aircraft.
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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