Airworthiness Directive · Amendment 39-14169 · Fokker Model F.28 Mark 1000, 2000, 3000, and 4000 Airplanes
Fokker Model F.28 Mark 1000, 2000, 3000, and 4000 Airplanes
This AD applies to all Fokker Model F.28 Mark 1000, 2000, 3000, and 4000 airplanes, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for all Fokker Model F.28 Mark 1000, 2000, 3000, and 4000 airplanes. This AD requires a detailed inspection to determine the presence of incorrectly installed bushings in the attachment holes of the reinforcing strap of the left- and right-hand wings' lower skin, and corrective actions if necessary. This AD is prompted by a report that bushings were installed in accordance with improper procedures in the structural repair manual. We are issuing this AD to detect and correct improperly installed bushings, which could result in reduced tensile strength of the reinforcing strap of the wing's lower skin, and consequently a reduction of the structural capability of the wing and possible wing failure.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Within 12 months or 3,000 flight cycles after the effective date of this AD, whichever occurs first, do a detailed inspection of the reinforcing strap of the left- and right-hand wings' lower skin at wing station (WS) 2635 for improperly installed bushings, in accordance with the Accomplishment Instructions of Fokker Service Bulletin F28/57-93, dated December 22, 2003.
Note 1: For the purposes of this AD, a detailed inspection is: “An intensive examination of a specific item, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at an intensity deemed appropriate. Inspection aids such as mirror, magnifying lenses, etc., may be necessary. Surface cleaning and elaborate procedures may be required.”
(1) If no improperly installed bushing is found, no further action is required by this AD.
(2) If any improperly installed bushing is found, before further flight:
(i) Repair the bushing in accordance with the Accomplishment Instructions of Fokker Service Bulletin F28/57-93, dated December 22, 2003; and
(ii) Replace the reinforcing strap with a new reinforcing strap in accordance with the Accomplishment Instructions of Fokker Service Bulletin F28/57-96, dated December 22, 2003.
