N. Move mode selector to MAN DC and check for the following:
(1)
AUTO FAIL light stays out
(2)
STANDBY light stays out
(3)
MANUAL light stays on
O. Hold MANUAL switch in OPEN position and check that outflow valve moves toward open.
P. Hold MANUAL switch in CLOSE position and check that outflow valve moves toward close.
Q. Allow at least 20 seconds from time mode selector was moved to AUTO (step 3.I.) then move mode selector to AUTO and check for the following:
(1)
AUTO FAIL light stays out
(2)
STANDBY light stays out
(3)
OFF SCHED DESCENT light stays out
(4)
MANUAL light goes out
(5)
Outflow valves moves to open
R. Remove electrical power if no longer required.
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PRESSURIZATION CONTROL SYSTEM - ADJUSTMENT/TEST
1. Pressurization Control System Test
A. General
(1)
The pressurization control system test consists of four tests. Two tests are required to verify the manual control features of pressurization control, and two other tests verify the automatic control and standby control features respectively. All tests must be accomplished to verify the pressurization control system, although there may be occasions during maintenance where only one of the tests is needed to prove the integrity of a part being replaced or repaired. The requirement for testing will be listed in applicable maintenance procedure when only a part of the system test is needed.
(2)
The four tests described are as follows: DC Manual Mode Test, AC Manual Mode Test, Standby Mode Test, and Automatic Mode Test. For a quick check of operational characteristics of pressurization control system, refer to Maintenance Practices.
(3)
Preparations listed in 1.B.(1) are applicable to all of the tests. Where additional preparation is required for any of the tests it will be listed as a step in the applicable test procedure. Special test equipment, if required, will be included in the test requiring the equipment.
WARNING: OUTFLOW VALVE IS MOTOR-OPERATED. DO NOT INSERT HAND OR TOOLS IN OUTLET DURING ANY GROUND OPERATION OR INJURY TO PERSONNEL MAY OCCUR.
NOTE: During ground operation, outflow valve gate drop when switching between AUTO and STBY, AUTO and DC MAN, STBY and AC MAN or AC MAN and DC MAN is considered normal.
(4) To prevent inadvertent cabin pressurization, an airplane door must be open if air is being supplied to air conditioning packs from a ground cart or APU/ENGINE unless performing tests per par. 3, 4 or 5.
B. DC Manual Mode Test
(1) Prepare to test DC Manual Mode.
(a)
Provide electrical power.
(b)
Check that the following circuit breakers on panel P6 are closed: 1) AUTOMATIC AC and DC 2) STBY AC and DC 3) MAN AC and DC
(c)
Place FLT-GRD switch on pressurization control panel to GRD.
(d)
Place mode selector switch to DC MAN.
(e)
Close LANDING GEAR – LIGHTS circuit breaker on panel P6.
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May 01/99 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 21-31-0 Page 501
NOTE: Allow approximately 15-minute warmup of electronic components before proceeding with tests on automatic or standby modes. AC manual and dc manual modes may be tested with no warmup.
(2) Test DC Manual Mode.
(a)
Place mode selector switch to DC MAN and check that MANUAL light comes on.
(b)
Check cabin pressurization outflow valve ground operation.
1) Move and hold the manual outflow valve toggle switch to CLOSED and verify the outflow valve moves toward the fully closed position in a smooth continuous manner by observing the valve position indicator. Check that the forward outflow valve light comes on. Visually check that the forward and aft outflow valves are fully closed.
2) Move and hold the manual outflow valve toggle switch to OPEN and verify the outflow valve moves toward the fully open position in a smooth continuous manner by observing the valve position indicator. Check that the forward outflow valve light goes out. Visually check that the forward and aft outflow valves are fully open.
3) Operate outflow valve toggle switch until VALVE position indicator is at about the center mark. 4) Place FLT-GRD switch to FLT.
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