AD 94-03-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Canada Corp. | PW118 | Airworthiness Directives; Pratt & Whitney Canada PW100 Series Turboprop Engines |
| engine | Pratt & Whitney Canada Corp. | PW118A | Airworthiness Directives; Pratt & Whitney Canada PW100 Series Turboprop Engines |
| engine | Pratt & Whitney Canada Corp. | PW120 | Airworthiness Directives; Pratt & Whitney Canada PW100 Series Turboprop Engines |
| engine | Pratt & Whitney Canada Corp. | PW120A | Airworthiness Directives; Pratt & Whitney Canada PW100 Series Turboprop Engines |
| engine | Pratt & Whitney Canada Corp. | PW121 | Airworthiness Directives; Pratt & Whitney Canada PW100 Series Turboprop Engines |
| engine | Pratt & Whitney Canada Corp. | PW123 | Airworthiness Directives; Pratt & Whitney Canada PW100 Series Turboprop Engines |
| engine | Pratt & Whitney Canada Corp. | PW124B | Airworthiness Directives; Pratt & Whitney Canada PW100 Series Turboprop Engines |
| engine | Pratt & Whitney Canada Corp. | PW125B | Airworthiness Directives; Pratt & Whitney Canada PW100 Series Turboprop Engines |
Unsafe Condition
High Pressure Turbine (HPT) disk failures in the rim region due to low cycle fatigue, which may result in uncontained engine failures and debris damage to the aircraft.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove from service HPT disks (part numbers 3035711 and 3038411) based on cycles in service (CIS) and replace with serviceable parts following a drawdown schedule. Establish a new service cycle life limit of 10,000 total CIS for these disks.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Required as indicated in the schedule based on cycles in service (CIS) on the effective date of the AD (February 16, 1994).
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney Canada (PWC) Model PW118, PW118A, PW120, PW120A, PW121, PW123, PW124B, and PW125B turboprop engines installed on various aircraft including de Havilland DHC-8, Embraer EMB-120, ATR-42/-72, Fokker 50, Canadair CL-215T/415, Dornier 328, British Aerospace ATP, and XAC Y7-200A.
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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