AD 99-15-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT9D-20 | Airworthiness Directives; Pratt & Whitney JT9D Series Turbofan Engines |
| engine | Pratt & Whitney Division | JT9D-20J | Airworthiness Directives; Pratt & Whitney JT9D Series Turbofan Engines |
| engine | Pratt & Whitney Division | JT9D-3A | Airworthiness Directives; Pratt & Whitney JT9D Series Turbofan Engines |
| engine | Pratt & Whitney Division | JT9D-7 | Airworthiness Directives; Pratt & Whitney JT9D Series Turbofan Engines |
| engine | Pratt & Whitney Division | JT9D-7A | Airworthiness Directives; Pratt & Whitney JT9D Series Turbofan Engines |
| engine | Pratt & Whitney Division | JT9D-7AH | Airworthiness Directives; Pratt & Whitney JT9D Series Turbofan Engines |
| engine | Pratt & Whitney Division | JT9D-7F | Airworthiness Directives; Pratt & Whitney JT9D Series Turbofan Engines |
| engine | Pratt & Whitney Division | JT9D-7H | Airworthiness Directives; Pratt & Whitney JT9D Series Turbofan Engines |
| engine | Pratt & Whitney Division | JT9D-7J | Airworthiness Directives; Pratt & Whitney JT9D Series Turbofan Engines |
Unsafe Condition
CCOC rupture due to cracking in the L-flange fillet radius, which could 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 on-wing ultrasonic inspections of the CCOC forward flange (L-flange) fillet radius for cracking in accordance with PW Alert Service Bulletin A6343 Revision 1. Thereafter, conduct repetitive on-wing ultrasonic inspections at intervals not exceeding 500 cycles in service. Replace cracked L-flanges with serviceable parts or improved L-flanges (P/N 734514, 056-1133-1, 758479, or CFL758479) to terminate inspections.
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Compliance Time
Initial inspections due within 250 cycles or next shop visit (for engines without prior eddy current inspection) or within 2,000 cycles or next shop visit after effective date (for engines with prior inspection). Repetitive inspections every 500 cycles.
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Affected Aircraft
Pratt & Whitney JT9D-3A, -7, -7H, -7A, -7AH, -7F, -7J, -20, and -20J engines with CCOC part numbers 644801, 693294, 709016, 729237, 729238, or 729239, installed on Boeing 747 and McDonnell Douglas DC-10 series aircraft.
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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