Abstract :
Pneumatic engine bleed air system is one of the main systems that functions to control the
flow of air distributed from the Pneumatic manifold. The main supply of bleed air to the manifold
is obtained directly from the engine stage 5th compressor. Damage to the bleed air regulator
component results in the distribution of bleed air not flowing, which is indicated by the
penumatic indicator on, and has the potential to endanger flight safety.
Analysis of failures that arise in the reduction of bleed air from the pressure indicator on
the pneumatic. In addition to using the observation method, this study also uses the fault tree
analysis method to find the cause of failure in the bleed air regulator component which functions
to control the amount of bleed water entering.
Zero duct pressure failure was caused by the bleed air regulator component, and
troubleshooting the bleed air regulator. The troubleshooting process for the bleed air regulator
is carried out referring to the Boeing 737-300 manual chapter 36. Replacement components are
carried out using AMM TASK 36-12-35, after replacing the bleed air regulator components, a
bleed air indicator system is produced which shows the pressure has returned to normal. By
using the fault tree analysis method, related to problems with Zero Duct ressure found 21 basic
events, namely (1) trouble hight stage valve, (2) trouble hight stage regulator, (3) trouble bleed
air regulator, (4) sensor pressure problem, ( 5) sensor temperature problem, (6) connector
problem, (7) pressure pipe problem, (8) hight stage regulator problem, (9) valve stage 9th supply
problem, (10) extension ring problem, (11) pipe side inner problem , (12) power supply problem,
(13) connector problem, (14) connector problem, (15) line problem, (16) connector valve
problem, (17) control valve supply line problem, (18) fan broken, (19 ) fan is bent, (20) TEE is
broken, and (21) is clogged with FOD.