AD 2004-20-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | Canada Models PW123 | Airworthiness Directives; Pratt & Whitney Canada Models PW123, PW123B, PW123C, PW123D, PW123E, PW123AF, PW124B, PW125B, PW126A, PW127, PW127E, PW127F, and PW127G Turboprop Engines |
Unsafe Condition
Loss of engine throttle response and overspeed, resulting in engine in-flight shutdown, due to specific mechanical fuel controls (MFCs) with part numbers 3244841-21, 3244853-17, 3244855-15, 3244857-14, 3244858-23, 3244871-5, 3244873-4, and 3244874-4.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform initial and repetitive gap inspections between the MFC bypass valve cover and the MFC main body, following Honeywell Service Information Bulletin No. 82. Replace the MFC with a new design MFC not listed in the AD within 4,500 hours time-in-service (TIS) or 24 months from the effective date, whichever occurs first.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 500 hours time-in-service after the effective date for initial inspection; repetitive inspections at intervals of 1,500 hours TIS; replacement of MFC within 4,500 hours TIS or 24 months from the effective date.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney Canada models PW123, PW123B, PW123C, PW123D, PW123E, PW123AF, PW124B, PW125B, PW126A, PW127, PW127E, PW127F, and PW127G turboprop engines with mechanical fuel controls (MFCs) part numbers 3244841-21, 3244853-17, 3244855-15, 3244857-14, 3244858-23, 3244871-5, 3244873-4, and 3244874-4, installed on various aircraft models including Aerospatiale ATR 42 and ATR 72, BAE Systems ATP, Bombardier DHC-8 series, CL-215T, CL-415, CASA C-295, Fokker F27 Mark 050, and Mark 060.
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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