Airworthiness Directive · Amendment 39-13837 · Fokker Model F27 Mark 100, 200, 300, 400, 500, 600, and 700 Series Airplanes
Fokker Model F27 Mark 100, 200, 300, 400, 500, 600, and 700 Series Airplanes
This AD applies to all Fokker Model F27 Mark 100, 200, 300, 400, 500, 600, and 700 series airplanes; certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for all Fokker Model F27 Mark 100, 200, 300, 400, 500, 600, and 700 series airplanes. This AD requires a one-time high-frequency eddy current inspection for cracking of the attachment lugs of the aileron spring tab balance unit, and corrective actions if necessary. This AD is prompted by a report indicating that, during heavy turbulence, a pilot needed to apply aileron trim to maintain level flight because cracking of the upper inboard attachment lug of the aileron spring tab balance unit, probably due to corrosion, had caused permanent deflection of the spring tab and consequent aileron damage. We are issuing this AD to prevent diminished control of the airplane in turbulence or total loss of roll control for the affected wing.
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 24 months after the effective date of this AD, perform a one-time high-frequency eddy current inspection for cracking of the attachment lugs of the aileron spring tab balance units by doing all the actions in the Accomplishment Instructions of Fokker Service Bulletin F27/27-137, dated March 19, 2003. If no loose paint, corrosion damage, or crack is found during this inspection, no further action is required by this AD.
If no crack is found during the inspection required by paragraph (f) of this AD, but it was necessary to remove loose paint or corrosion to perform the inspection: Prior to further flight, rework the attachment lugs in accordance with the Accomplishment Instructions of Fokker Service Bulletin F27/27-137, dated March 19, 2003. If corrosion damage has caused any attachment lug to exceed the dimensional limits specified in the service bulletin: Prior to further flight, replace the aileron spring tab balance unit with a serviceable unit, in accordance with the Accomplishment Instructions of Fokker Service Bulletin F27/27-137, dated March 19, 2003, or repair the lug in accordance with a method approved by the Manager, International Branch, ANM-116, FAA, Transport Airplane Directorate; or the Civil Aviation Authority—The Netherlands (CAA-NL) (or its delegated agent).
If any crack is found during the inspection required by paragraph (f) of this AD: Prior to further flight, replace the aileron spring tab balance unit with a serviceable unit, in accordance with the Accomplishment Instructions of Fokker Service Bulletin F27/27-137, dated March 19, 2003.
(i) Although Fokker Service Bulletin F27/27-137, dated March 19, 2003, specifies to submit certain information to Fokker Services B.V., this AD does not include such a requirement.
