(a) To use the engines to pressurize the TAI duct, do this task: Start the Engine Procedure
(Selection), TASK 71-00-00-800-807-F00.
(b) To use the APU to pressurize the TAI duct, do this task: Supply Pressure to the
Pneumatic System with the APU, TASK 36-00-00-860-803.
(c) To use an external air supply to pressurize the TAI duct, do this task: Supply Pressure to
the Pneumatic System with an External Ground Air Source, TASK 36-00-00-860-802.
(d) If you use the APU or external air to pressurize the TAI duct, then do these steps:
1) Put the BLEED 1 and 2 switches on the air conditioning panel in the OFF position.
2) Put the L PACK and R PACK switches on the air conditioning panel in the OFF
position.
3) Make sure the ISOLATION VALVE switch is in the OPEN or the AUTO position.
(e) Do these steps on the applicable engine to manually open the PRSOV at the applicable
engine:
WARNING
DO THESE SPECIFIED TASKS IN THE CORRECT SEQUENCE
BEFORE YOU OPEN THE THRUST REVERSER: RETRACT THE
LEADING EDGE, DO THE DEACTIVATION PROCEDURES FOR THE
LEADING EDGE AND THE THRUST REVERSER (FOR GROUND
MAINTENANCE), AND OPEN THE FAN COWL PANELS. IF YOU DO
NOT OBEY THE ABOVE SEQUENCE, INJURIES TO PERSONS AND
DAMAGE TO EQUIPMENT CAN OCCUR.
1) Open the left thrust reverser. To open it, do this task: Open the Thrust Reverser
(Selection), TASK 78-31-00-010-801-F00.
2) Put the applicable engine BLEED switch, on the P5-10 panel, to the ON position.
3) Use a wrench on the manual override nut for the PRSOV to put it to the open
position.
4) Make sure that the PRSOV stays in the open position.
NOTE: The PRSOV is spring-loaded to the closed position. If there is pressure
supplied and the PRSOV does not stay open, there may be a leakage in the
PRSOV or in the sense line(s).
WARNING
OBEY THE INSTRUCTIONS IN THE PROCEDURE TO CLOSE THE
THRUST REVERSERS. IF YOU DO NOT OBEY THE
INSTRUCTIONS, INJURIES TO PERSONS AND DAMAGE TO
EQUIPMENT CAN OCCUR.
5) Close the thrust reverser. To close it, do this task: Close the Thrust Reverser
(Selection), TASK 78-31-00-010-804-F00.
SUBTASK 30-21-11-860-010
(3) Do this test of the COWL VALVE OPEN and COWL ANTI-ICE light switches:
(a) Push and release the COWL VALVE OPEN and COWL ANTI-ICE light switches on the
P5-11 panel.
(b) Make sure each light comes on then goes off.
SUBTASK 30-21-11-860-011
(4) Make sure the engine and wing anti-ice panel commands the applicable cowl TAI valves open:
(a) For the left cowl TAI valve, put the ENG ANTI-ICE 1 switch in the ON position.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-21-11
Page 409
D633A101-ILF Oct 15/2017
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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