Airworthiness Directive · Amendment 39-14960 · 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 one-time inspection of the left- and right-hand main landing gear (MLG) downlock actuators or a review of the airplane maintenance records to determine the part number of each downlock actuator installed, and replacement of identified MLG downlock actuators with modified MLG downlock actuators. This AD results from a report of a failed downlock actuator, which resulted in the left MLG collapsing during taxi after landing. We are issuing this AD to prevent failure of the downlock actuator, which could prevent the MLG side stay from locking properly, resulting in collapse of the MLG during ground maneuvers or upon 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 66 months after the effective date of this AD: Inspect the left- and right-hand MLG downlock actuators to determine if P/N 200497005 or 200498005 is installed. A review of airplane maintenance records is acceptable in lieu of this inspection if the part number of the MLG downlock actuator can be conclusively determined from that review. If an MLG downlock actuator does not have a subject part number, no further action is required by this AD for that MLG only, except as provided by paragraph (h) of this AD.
For any MLG downlock actuator identified during the inspection or maintenance records review required by paragraph (f) of this AD, or for which the part number cannot be determined: Within 66 months after the effective date of this AD, replace the MLG downlock actuator with a modified MLG downlock actuator in accordance with the Accomplishment Instructions of Fokker Service Bulletin F28/32-163, dated March 8, 2004.
Note 1: Fokker Service Bulletin F28/32-163 refers to Dowty Aerospace Hydraulics—Cheltenham Service Bulletin 32-501R, Revision 1, dated September 3, 1998, as an additional source of service information for modifying the MLG downlock actuator.
As of the effective date of this AD, no person may install an MLG downlock actuator, P/N 200497005 or 200498005, on any airplane.
