Airworthiness Directive · Amendment 39-9706 · Fokker Model F28 Mark 1000, 2000, 3000, and 4000 Series Airplanes, and Model F28 Mark 0100 Series Airplanes
Fokker Model F28 Mark 1000, 2000, 3000, and 4000 Series Airplanes, and Model F28 Mark 0100 Series Airplanes
Applies to the airplanes specified in Table 1 of this AD (equipped as specified), certificated in any category: Table 1 Airplane model Equipped with F28 Mark 1000, 2000, 3000, Dowty Aerospace main landing gear (MLG) and 4000 series airplanes. downlock-actuators, part number (P/N) 200497-004 or P/N 200498-004 (on which Dowty Service Bulletin 32-17 has not been accomplished) or Dowty Aerospace main landing gear (MLG) downlock-actuators, P/N 200497-005 or 200498-005 (on which Dowty Service Bulletin 32-17 has been accomplished); F28 Mark 0100 series Dowty Aerospace MLG downlock-actuators, P/ airplanes. N 201218-005, -006, -007, or -008.
This amendment adopts a new airworthiness directive (AD), applicable to certain Fokker Model F28 Mark 1000, 2000, 3000, and 4000 series airplanes, and Model F28 Mark 0100 series airplanes, that requires repetitive pre-load adjustments of the main landing gear (MLG) downlock-actuator. This AD also provides optional terminating action for the repetitive adjustments. This amendment is prompted by a report that, upon landing, the MLG of an airplane collapsed as a result of the lock toggle-links being pulled out of the over-center position by the downlock-actuator, which was due to the relative movement of the upper and lower side-stay members. The actions specified by this AD are intended to prevent collapse of the MLG, which could adversely affect the controllability of the airplane during landing.
