Airworthiness Directive · Amendment 39-14259 · Fokker Model F27 Mark 200, 400, 500, and 600 Airplanes
Fokker Model F27 Mark 200, 400, 500, and 600 Airplanes
This AD applies to Fokker Model F27 Mark 200, 400, 500, and 600 airplanes, certificated in any category; serial numbers 10505 through 10591 inclusive; not equipped with inboard wing fuel tanks.
The FAA is adopting a new airworthiness directive (AD) for certain Fokker Model F27 Mark 200, 400, 500, and 600 airplanes. This AD requires a general visual inspection of the rotary knobs for the fuel tank isolation valves to determine if the seal wire has been installed correctly, and corrective actions if necessary. This AD results from investigation of a recent accident, which found that the rotary knobs controlling the fuel tank isolating valves had been in the shut position. We are issuing this AD to ensure that the rotary knobs are not inadvertently moved to the shut position, which could result in fuel starvation to both engines and consequent inability to maintain controlled flight and landing.
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 3 months after the effective date of this AD, do a general visual inspection of the rotary knobs for the fuel tank isolation valves to determine if the seal wire is installed correctly and do the corrective action(s) as applicable, in accordance with the Accomplishment Instructions of Fokker Service Bulletin F27/28-67, dated February 23, 2004. Do the applicable corrective actions before further flight.
Note 1: For the purposes of this AD, a general visual inspection is: “A visual examination of an interior or exterior area, installation, or assembly to detect obvious damage, failure, or irregularity. This level of inspection is made from within touching distance unless otherwise specified. A mirror may be necessary to ensure visual access to all surfaces in the inspection area. This level of inspection is made under normally available lighting conditions such as daylight, hangar lighting, flashlight, or droplight and may require removal or opening of access panels or doors. Stands, ladders, or platforms may be required to gain proximity to the area being checked.”
Actions done before the effective date of this AD in accordance with Fokker Service Bulletin F27/28-58, dated May 12, 1986, are acceptable for compliance with the requirements of paragraph (f) of this AD.
As of the effective date of this AD, no person may install a rotary knob having part number E10632-3, 10632-10003, or P80-004 on any airplane, unless the corrective actions specified in paragraph (f) of this AD have been accomplished.
(i) Although the service bulletin referenced in this AD specifies to submit certain information to the manufacturer, this AD does not include that requirement.
