S 212-019
(5)
Monitor the two indicators for the duct pressure on the forward overhead panel.
(a) Make sure each indicator shows 10-25 psi.
NOTE: The engine(s) must be at idle and there must not be
____ a demand for pneumatic air from other systems.
(b) Slowly increase the engine power until the duct pressure increases to 42 |8 psi. 1) Do not increase the engine power to more than 80% N1.
TASK 36-05-00-862-020
5. Remove the Pressure from the Pneumatic System
_____________________________________________
A. References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 49-11-00/201, APU Power Plant
(3)
AMM 71-00-00/201, Power Plant
B. Access
(1)
Location Zones
101/102 Control Cabin
200 Lower Half of the Fuselage
(2)
Access Panel
3404 A/C Access Door, Right
C. Remove the Pressure from the Pneumatic System
S 862-021
WARNING: YOU MUST STOP THE OPERATION OF THE SOURCE USED TO PRESSURIZE
_______ THE PNEUMATIC SYSTEM. IF THE PNEUMATIC SYSTEM IS PRESSURIZED DURING THE MAINTENANCE, IT CAN CAUSE DAMAGE TO THE EQUIPMENT OR INJURIES TO PERSONS.
(1) Stop the operation of the applicable source that follows which is used to pressurize the pneumatic system:
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A
737-300/400/500MAINTENANCE MANUAL
WARNING: DO NOT DISCONNECT THE GROUND AIR SOURCE FROM THE AIRPLANE
_______ IF ENGINE 2 OPERATES AT MORE THAN MINIMUM IDLE. IF ENGINE 2 OPERATES AT MORE THAN MINIMUM IDLE, INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR. MAKE SURE YOU OBEY THE INLET HAZARD AREAS IF ONE OR BOTH ENGINES ARE IN OPERATION (AMM 71-00-00/201).
(a)
The ground air source.
(b)
The APU (AMM 49-11-00/201).
(c)
The engine(s) (AMM 71-00-00/201).
S 862-022
(2)
Make sure the applicable BLEED switch, on the forward overhead panel, is in the OFF position (Fig. 201).
S 212-023
(3)
Make sure the two indicators, on the forward overhead panel, show 0 psi.
D. Put the Airplane Back to Its Usual Condition
S 412-025
(1) If it is applicable, disconnect the pneumatic line for the ground air source.
(a) Close the right A/C access door, 3404, for the pneumatic ground service connector (Fig. 201).
S 862-024
(2) Remove the electrical power if it is not necessary
(AMM 24-22-00/201).
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737-300/400/500MAINTENANCE MANUAL
ENGINE BLEED AIR DISTRIBUTION SYSTEM -
______________________________________ DESCRIPTION AND OPERATION
_________________________
1. General_______
A. The engine bleed air distribution system is a manifold of ducts and valves which carries hot compressed air from the engine compressor to the air conditioning packs and to the air-dependent units and subsystems in other systems. Air source, pressure, and temperature controlling components are part of the system. Ducts from the engines pass through control components and join the respective left or right wing manifolds. A crossover duct, forward and below the center wing section front spar joins the left and right wing manifold sections to form the complete cross-ship pneumatic manifold. The air control components connecting the pneumatic manifold to related systems are covered as part of the systems they serve.
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