1AD/F50/79 Amdt 4 - Control Surfaces Leading Edge Attachment

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AIRWORTHINESS DIRECTIVE

For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/F50/79 Amdt 3 and issues the following AD under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

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Fokker F50 (F27 Mk 050) Series Aeroplanes

AD/F50/79

Amdt 4

Control Surfaces Leading Edge Attachment 11/2002

Applicability: Model F27 Mk 050, Mk 0502, and Mk 0604 aircraft, all serial numbers.

Requirement: 1. Check the torque value of the elevator leading edge attachment screws and take corrective action, as necessary, in accordance with the Accomplishment Instructions of Fokker Service Bulletin (SB) F50-55-007 Revision 2, dated 17 June 2002.

2. Check the torque value of the rudder leading edge section attachment screws and take corrective action, as necessary, in accordance with the Accomplishment Instructions of Fokker SB F50-55-009 Revision 2, dated 17 June 2002.
3. Check the torque value of the aileron leading edge sections attachment screws and take corrective action, as necessary, in accordance with the Accomplishment Instructions of Fokker SB F50-57-020 Revision 2, dated 17 June 2002.
4. Modify the flight control surface leading edge section attachments by installing additional locking devices as follows:

for the rudder; in accordance with Fokker SB F50-55-010 Revision 2, dated 17 June 2002.

b. for the ailerons; in accordance with Fokker SB F50-57-021 Revision 2, dated 17 June 2002.

c. for the elevators; in accordance with Fokker SB F50-55-008 Revision 3, dated 17 June 2002.

Note 1: Compliance with Requirement 4 constitutes terminating action for the actions required by Requirements 1, 2, and 3.

Note 2: Netherlands CAA AD 2000-131/2 refers.

Compliance: 1. Within the next 6 months after 31 October 2002 or at the expiry of the 12 calendar months interval as required by the previous issue of this Directive, whichever occurs first, and thereafter at intervals not to exceed 6 calendar months; until compliance with Requirement 4.