AD 91-24-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Canada Corp. | PW123 | PRATT & WHITNEY CANADA Models PW123, PW124B, PW125B, and PW126A Engines |
| engine | Pratt & Whitney Canada Corp. | PW124B | PRATT & WHITNEY CANADA Models PW123, PW124B, PW125B, and PW126A Engines |
| engine | Pratt & Whitney Canada Corp. | PW125B | PRATT & WHITNEY CANADA Models PW123, PW124B, PW125B, and PW126A Engines |
| engine | Pratt & Whitney Canada Corp. | PW126A | PRATT & WHITNEY CANADA Models PW123, PW124B, PW125B, and PW126A Engines |
Unsafe Condition
Low pressure turbine (LPT) overspeed could result in uncontained disk failure and subsequent damage to the aircraft.
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Required Actions
Perform specified turbomachinery magnetic chip detector (MCD) continuity, functional, and airframe circuitry checks within specified intervals. Incorporate a new low pressure rotor balancing assembly via SB 21018 by the next engine shop visit or by June 30, 1994.
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Compliance Time
Within 5 days after the effective date of this AD for initial checks; thereafter at intervals not exceeding 25 flight hours (continuity checks), 300 flight hours (functional checks), or 1,000 flight hours (operational checks). The low pressure rotor balancing assembly must be incorporated by the next engine shop visit or by June 30, 1994.
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Affected Aircraft
Pratt & Whitney Canada PW123, PW124B, PW125B, and PW126A engines installed on DeHavilland Dash 8 Series 300, Aerospatiale ATR72, Fokker 50, and British Aerospace ATP aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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