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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
S 865-075
WARNING: YOU MUST ISOLATE THESE SYSTEMS BEFORE YOU PRESSURIZE THE
_______ PNEUMATIC SYSTEM:
-
THE AIR CONDITIONING SYSTEM
-
THE ENGINE START SYSTEM
-
THE COWL AND WING ANTI-ICE DUCTS
-
THE HYDRAULIC RESERVOIR
-
THE POTABLE WATER TANKS.
IF YOU DO NOT ISOLATE THESE SYSTEMS, THEY CAN OPERATE AND THE PNEUMATIC SYSTEM CAN LOSE PRESSURE. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(3) Connect the pneumatic line to the connector for the ground pneumatic source.
S 865-076
CAUTION: YOU MUST SUPPLY THE ELECTRICAL POWER BEFORE YOU SUPPLY THE
_______ PNEUMATIC POWER. IF YOU DO NOT SUPPLY THE ELECTRICAL POWER FIRST, YOU CAN CAUSE DAMAGE TO THE COMPONENTS OF THE AIR CONDITIONING SYSTEM.
(4)
Supply electrical power (AMM 24-22-00/201).
S 015-055
(5)
Open the left thrust reverser half on the applicable engine (AMM 78-31-00/201).
S 865-077
WARNING: DO NOT SUPPLY MORE THAN 60 PSIG OF PRESSURE TO THE PNEUMATIC
_______ SYSTEM. IF YOU SUPPLY TOO MUCH PRESSURE, DAMAGE TO EQUIPMENT AND INJURY TO PERSONNEL CAN OCCUR.
(6) Prepare for the test:
(a)
Make sure that the applicable COWL VALVE OPEN light on the P5 panel is off.
(b)
BEJ B-2535 AND ON; Disconnect the electrical connector from the bleed air regulator on the applicable engine.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
F. Pressurize the pneumatic system:
S 785-081
WARNING:_______MAKE SURE THAT YOU DO THESE STEPS IN THE ORDER GIVEN. IF YOU PRESSURIZE THE PNEUMATIC SYSTEM AFTER YOU MANUALLY OPEN THE
_____ PRSOV, THE PRSOV CAN MOVE THE WRENCH HANDLE SUDDENLY. THIS CAN CAUSE INJURY TO YOU.
(1)
Start the ground air source and regulate the pressure to 35-45 PSI.
S 865-053
(2)
If this test is for the right engine, set the Isolation Valve switch on the P5 Panel to open.
S 215-057
(3)
Make sure that the applicable duct pressure pointer on the P5 panel shows 35 to 45 psi.
NOTE: It is necessary that no other airplane systems use
____
pneumatic power at this time.
S 985-079
WARNING: YOU MUST USE A RATCHETING-TYPE SOCKET WRENCH TO MANUALLY OPEN
_______ THE PRSOV. THE PRSOV WILL SUDDENLY TURN THE WRENCH SOCKET BUT THE RATCHET WILL PREVENT MOVEMENT OF THE WRENCH HANDLE. IF YOU DO NOT USE A RATCHETING-TYPE WRENCH, THE SUDDEN MOVEMENT OF THE PRSOV CAN CAUSE INJURY TO YOU.
(4)
Manually open the PRSOV with a ratcheting type wrench and hold it open.
S 715-060
(5)
Do this test of the TAI valve operation:
CAUTION: DO NOT ALLOW THE COWL TAI VALVE TO BE OPEN FOR MORE THAN
_______ 30 SECONDS. IF THE VALVE IS OPEN FOR MORE THAN 30 SECONDS, THERE CAN BE DAMAGE TO THE INLET COWL.
(a)
Set the applicable ENG ANTI-ICE switch to ON. 1) Make sure that the COWL VALVE OPEN light comes on bright (this shows that the valve is in transit).
2) Make sure that the COWL VALVE OPEN light becomes dim and stays on (this shows that the valve is open).
(b)
Set the ENG ANTI-ICE switch to OFF. 1) Make sure that the COWL VALVE OPEN light comes on bright. 2) Make sure that the COWL VALVE OPEN light goes off.
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