E. Prepare to Do the Leakage Test for the Pneumatic Ducts
S 865-165
(1) Supply electrical power (AMM 24-22-00/201).
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S 865-135
(2) Set the switches that follow to the positions shown:
(a)
1 BLEED - OFF
(b)
2 BLEED - OFF
(c)
APU BLEED - OFF
(d)
L PACK - OFF
(e)
R PACK - OFF
(f)
WING TAI - OFF
(g)
ENGINE TAI - OFF
(h)
ISOLATION VALVE - OPEN
(i)
L ENGINE START - OFF
(j)
R ENGINE START - OFF
S 015-082
(3) Open the fan cowl panels (AMM 71-11-04/201).
S 015-101
WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO OPEN THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS WHEN YOU OPEN THE THRUST REVERSERS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
(4)
Open the thrust reversers (AMM 78-31-00/201).
S 015-102
(5)
Open the air conditioning access panels.
S 015-074
(6)
Open the removable slat access panels, 6307L and 6407R.
S 865-009
(7)
Manually lock the high stage valve on each engine in the CLOSED position.
S 865-103
(8)
Make sure these position indicators, for the valves that follow, show the CLOSED position:
(a)
Engine 1 Start Valve
(b)
Engine 2 Start Valve
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737-300/400/500MAINTENANCE MANUAL
(c)
Engine 1 PRSOV
(d)
Engine 2 PRSOV
(e)
Left Wing TAI
(f)
Right Wing TAI
(g)
Engine 1 TAI
(h)
Engine 2 TAI
(i)
L Turbofan Control
(j)
R Turbofan Control
(k)
L A/C Pack Valve
(l)
R A/C Pack Valve
F. Do the Leakage Test.
S 865-136
(1)
Put the 1 BLEED switch to the ON position.
S 865-001
(2)
Put the 2 BLEED switch to the ON position.
S 435-000
(3)
Connect the air supply source at the ground air connection.
S 985-054
WARNING:_______USE A RATCHET TYPE WRENCH TO OPEN THE PRSOV. THE PRSOV CAN OPEN QUICKLY AND CAN PULL THE WRENCH FROM YOUR HANDS IF THERE IS PRESSURE IN THE PNEUMATIC SYSTEM WHEN YOU OPEN THE PRSOV. THIS CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
(4) Manually wrench the PRSOV on each engine to the OPEN position with a ratchet type wrench.
NOTE: The PRSOV will remain open when there is pneumatic
____
pressure upstream of the PRSOV.
S 785-003
WARNING:_______BE CAREFUL WHEN YOU PRESSURIZE THE PNEUMATIC DUCTS. IF THE DUCTS COME APART WHEN THEY ARE PRESSURIZED, THEY CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
(5)
Pressurize the system and maintain pressure at 35 psig.
(6)
Examine all of the connections of the pneumatic ducts for leakage.
S 215-130
NOTE: Access panels in the air conditioning bays, engine
____ compartments, and wing leading edge slats are to be opened to expose the pneumatics ducts to be examined.
(a) Diffused leakage is permitted.
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