SUBTASK 30-21-00-910-002
(2) There is no time limit for operation of the engine cowl anti-icing system when the temperature
is at or less than 50°F (10°C).
SUBTASK 30-21-00-840-002
(3) Do these steps to provide pneumatic pressure for the ducts:
(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, external air, or a single engine 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.
4) If you use the APU or external air to pressurize the TAI duct, then you must
manually open the PRSOV valves.
5) If you use the a single engine to pressurize the TAI duct, then you must manually
open the PRSOV valve on the non-running engine.
6) To open a PRSOV valve, do these steps on the applicable engine or engines:
WARNING
DO THESE SPECIFIED TASKS IN THE CORRECT SEQUENCE
BEFORE YOU OPEN THE THRUST REVERSERS: 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.
a) Open the left thrust reverser. To do this, do this task: Open the Thrust
Reverser (Selection), TASK 78-31-00-010-801-F00.
b) Put the applicable engine BLEED switch on the P5-10, forward overhead
panel to the ON position.
c) Use a wrench on the manual override nut for the PRSOV to put it to the open
position.
d) 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).
SUBTASK 30-21-00-860-003
(4) 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.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-21-00
Page 502
D633A101-ILF Feb 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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