Abstract :
Propeller is one of the important components in the aircraft, which serves to convert
the rotation of the turboprop engine and provide thrust or thrust. The KT-1B Woong Bee
has four blades, adjustable pitch, and propeller constant speed propeller. The propeller is
driven by a power turbine through a reduction gear, and also a constant speed propeller is
constant controlled by an E/G speed sensing device, namely the governor to maintain RPM
engine orrotation propeller, by simply changing theangle propeller blade from feather (87?)
to fine pitch (11-12?) and vice versa which is done with a single PCL (Power Control Lever)
which is installed in each control quadrant and located on the L/H console of each cockpit.
Problems at the pitch change in the propeller causing the blade angle is not as required,
namely of angle feather (87?) to angle fine-pitch (11-12?) Failure of this pitch change can
cause the aircraft to be unfit to fly and move through the air.
The failure analysis that appears in the pitch change on the propeller is based on
observations and also information obtained from the field instructor. In addition to using the
method of observation, this study also using Fault Tree Analysis (FTA) to get at the cause of
the problems pitch in the propellerchange.
After knowing the problem, then conducting an initial inspection which found that the
propeller governor could not work optimally, due to damage to thesection pressure pump
located inside the propeller governor which would result in a lack of pressure oilto push the
feathering spring on the pitch change mechanism. This can result in the propeller not being
able to change the angle as needed, namely fine pitch (11-12?) and feather (87?). In order
for the propeller to change itspitchto the desired condition, it is deemed necessary to replace
the propeller governor in accordance with the TO 1T-KT1B-2-5JG-7 reference.