Airworthiness Directive · Amendment 39-11513 · Fokker Model F27 Mark 050 Series Airplanes
Fokker Model F27 Mark 050 Series Airplanes
All Model F27 Mark 050 series airplanes, certificated in any category.
This amendment adopts a new airworthiness directive (AD), applicable to certain Fokker Model F27 Mark 050 series airplanes. For certain airplanes, this action requires modification of the electrical power supply of the landing gear anti-skid unit. For certain airplanes, this action also requires a revision to the Airplane Flight Manual (AFM) to provide the flight crew with procedures for calculating the accelerate-stop distance for certain conditions, and installation of a new ground idle stop assembly and new placards on the top cover of the pedestal, which terminates the requirements for the AFM revision. 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 interruption of the anti- skid system function, or inadvertent selection of reverse thrust during a rejected takeoff. Either of these conditions could result in reduced controllability of the airplane.
Required as indicated, unless accomplished previously.
To prevent reduced controllability of the airplane as a result of interruption of the anti-skid system function, or inadvertent selection of reverse thrust during a rejected takeoff, accomplish the following:
Modification for Certain Airplanes
(a) For Model F27 Mark 050 series airplanes equipped with Pratt & Whitney Model PW127B engines: Within 12 months after the effective date of this AD, modify the electrical power supply of the landing gear anti-skid unit in accordance with Fokker Service Bulletin SBF50-32-031, dated December 20, 1996.
Airplane Flight Manual Revision and Installation For Certain Airplanes
(b) For Model F27 Mark 050 series airplanes, as listed in Fokker Service Bulletin SBF50-76-016, dated December 20, 1996: Accomplish the actions specified in paragraphs (b)(1) and (b)(2) of this AD.
(1) Within 10 days after the effective date of this AD, revise the Limitations Section of the FAA-approved Airplane Flight Manual (AFM) to include the following statement. This may be accomplished by inserting a copy of this AD in the AFM.
``Correct the `available accelerate-stop distance' as follows:
For dry runways, multiply the relevant figure by 0.9; For wet runways, subtract 525 feet (160 meters) from the relevant figure; and
For contaminated and slippery runways, subtract 1,181 feet (360 meters) from the relevant figure.
Additionally, the required accelerate-stop distance, as calculated from the AFM for a given airplane weight and V1 or Vstop must be increased in accordance with the same factors given for available accelerate-stop distance, as shown above.''
(2) Within 12 months after the effective date of this AD, install a new ground idle stop assembly and new placards on the top cover of the pedestal, in accordance with Fokker Service Bulletin SBF50-76-016, dated December 20, 1996. Following accomplishment of these actions, the AFM revision required by paragraph (b)(1) of this AD may be removed from the AFM.
