Airworthiness Directive · Amendment 39-11494 · Fokker Model F27 Mark 050 Series Airplanes
Fokker Model F27 Mark 050 Series Airplanes
Superseded. A later AD replaced this one: AD 2005-25-06. Comply with the one in force.
All Model F27 Mark 050 series airplanes, certificated in any category.
This amendment adopts a new airworthiness directive (AD), applicable to all Fokker Model F27 Mark 050 series airplanes. This action requires using a torque wrench to repetitively tighten the screws for the attachment of the leading edges of the elevators, rudder, and ailerons. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified in this AD are intended to prevent loose attachment screws on the leading edges of the elevators, rudder, and ailerons due to vibration, which could result in interference with adjacent structure and consequent reduced controllability of the airplane.
Required as indicated, unless accomplished previously.
To prevent loose attachment screws on the leading edges of the elevators, rudder, and ailerons due to vibration, which could result in interference of the leading edges with adjacent structure and consequent reduced controllability of the airplane; accomplish the following:
Repetitive Corrective Action
(a) Within 30 days after the effective date of this AD, use a torque wrench to tighten the screws for the attachment of the leading edges of the elevators in accordance with Fokker Service Bulletin SBF50-55-007, dated June 5, 1998. Repeat the tightening thereafter at intervals not to exceed 12 months.
(b) Within 24 months after the effective date of this AD, use a torque wrench to tighten the screws for the attachment of the leading edges of the rudder in accordance with Fokker Service Bulletin SBF50-55-009, Revision 1, dated July 23, 1999. Repeat the tightening thereafter at intervals not to
exceed 4,000 flight hours or 24 months, whichever occurs first.
(c) Within 6 months after the effective date of this AD, use a torque wrench to tighten the screws for the attachment of the leading edges of the ailerons in accordance with Fokker Service Bulletin SBF50-57-020, Revision 1, dated July 23, 1999. Repeat the tightening thereafter at intervals not to exceed 12 months.
