Airworthiness Directive 2001-16-04
one-timeAirworthiness Directives; Fokker Model F27 Mark 050 Series Airplanes Equipped With Pratt & Whitney Canada Model PW127B Engines
What this AD requires
This amendment adopts a new airworthiness directive (AD), applicable to certain Fokker Model F27 Mark 050 series airplanes equipped with certain Pratt & Whitney Canada Model PW127B engines. This action requires replacing both torque sensor No. 1 and the electrical connectors on the wiring harness between torque sensor No. 1 and the auto-feathering unit (AFU). This action is necessary to prevent inadvertent autofeathering of the propellers, due to interruption of the torque signal between torque sensor No. 1 and the AFU, which could result in loss of engine power and loss of control of the airplane. This action is intended to address the identified unsafe condition.
Which aircraft AD 2001-16-04 applies to
Applies to airplanes with torque sensor No. 1 and the auto-feathering unit (AFU) electrical wiring/connectors (P6, P16) as covered by PWC SB No. 21533 (Fokker Services document); requires replacement of torque sensor No. 1 with improved P/N 3115558-01 and replacement of connectors P6/P16 with improved connectors, to prevent inadvertent propeller autofeathering from a torque-signal interruption. No specific airframe or engine model designation is stated in this applicability text.
Whether AD 2001-16-04 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.
How AD compliance is recorded
A valid compliance record (14 CFR 43.9) states:
Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.
Look up a tail number →Read the full directive (Federal Register)Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.