AD 99-20-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | PW2037 | Airworthiness Directives; Pratt & Whitney PW2000 Series Turbofan Engines |
| engine | Pratt & Whitney Division | PW2037M | Airworthiness Directives; Pratt & Whitney PW2000 Series Turbofan Engines |
| engine | Pratt & Whitney Division | PW2040 | Airworthiness Directives; Pratt & Whitney PW2000 Series Turbofan Engines |
| engine | Pratt & Whitney Division | PW2240 | Airworthiness Directives; Pratt & Whitney PW2000 Series Turbofan Engines |
| engine | Pratt & Whitney Division | PW2337 | Airworthiness Directives; Pratt & Whitney PW2000 Series Turbofan Engines |
Unsafe Condition
High Pressure Turbine (HPT) stage 1 and stage 2 disks may have subsurface anomalies formed during forging, which could cause disk fracture and result in uncontained engine failure.
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Required Actions
Perform initial and repetitive ultrasonic inspections of HPT stage 1 and 2 disks at each separation from the HPT module using PW SB PW2000 72-628. Send disks to an approved facility listed in the SB. Remove and replace disks with subsurface anomalies indicated by cracks.
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Compliance Time
After the effective date of this AD (November 23, 1999)
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Affected Aircraft
Pratt & Whitney PW2037, PW2037M, PW2040, PW2240, PW2337 turbofan engines installed on Boeing 757 and Ilyushin IL-96T series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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