Abstract :
Flap mechanics are several components in the flap system that assist in
regulating the movement of the flap surface, both retraction and extension according
to the command of the flap control lever in the cockpit. The flap system found on the
Boeing 737-500 has a function, namely to increase the lift from the aircraft wing as
determined when the aircraft is going to takeoff to climbing.
Flap failure analysis on the aircraft based on the results of observations and
information obtained at PT. Pigeon Maintenance Facility. In addition, this study also
uses the fault tree analysis method to find the cause of the problem that the flap
cannot operate on the Boeing 737-500 aircraft.
When checking the cause of the problem, the hydraulic motor flap component
was damaged where the cylinder wall was scratched and the cylinder piston was
damaged. This is due to foreign body damage (FOD) entering along with the
hydraulic fluid. Because the damage to the flap hydraulic motor cannot be repaired,
the entire flap hydraulic motor component is replaced. By analyzing the causes of
failure in operational flaps using the FTA method, we get 10 basic events consisting
piston stuck, piston and piston wall scratched, gear reduction no lubricte, gear
reduction aus, high tension cable, low tension cable, cam roller broken, linkage
broken, slide assembly stuck, control unit linkage stuck.