38-15-67
ú ú 01 Page 202 ú Oct 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
C81961
A
747-400
MAINTENANCE MANUAL
S 022-006
CAUTION:_______PUT A WRENCH ON EACH SIDE OF THE CONNECTION. THIS WILL PREVENT MOVEMENT AND DAMAGE TO THE PRESSURIZATION MANIFOLD.
(5)
Remove the pressure switch from the pressurization manifold.
S 032-007
(6)
Remove and discard the O-ring.
TASK 38-15-67-382-008
3. Pressure Switch Installation (Fig. 201)____________________________
A. Consumable Materials
(1) D00463 Lubricant - White Protopet 1S (Witco Corp, New York, NY 07804)
B. References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 38-15-60/201, Water System Pressurization
C. Access
(1) Location Zone 124 Forward Cargo Container Compartment Aft Half, Right
D. Procedure
S 642-009
(1) Apply a thin layer of white protopet 1S lubricant on the surface of the new O-ring.
S 422-010
CAUTION:_______PUT A WRENCH ON EACH SIDE OF THE CONNECTION. THIS WILL PREVENT MOVEMENT AND DAMAGE TO THE PRESSURIZATION MANIFOLD.
(2)
Install the pressure switch and the O-ring on the pressurication manifold.
S 862-011
(3)
Do this task: "Water System Pressurization" (AMM 38-15-60/201).
S 712-012
(4)
Make sure the compressor operates and then stops after approximately 5 minutes.
(5)
Make sure there are no leaks at the pressure switch connection.
S 792-013
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38-15-67
ú ú 01 Page 203 ú Feb 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
S 412-014
(6)
Do the "Containerized Cargo Compartment Ceiling and Sidewall Linings Installation" task (AMM 25-52-01/401) to install the sidewall and ceiling panels.
S 862-015
(7)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
TASK 38-15-67-702-016
4. Pressure Switch - Operational Test
__________________________________
A. General
(1) This test removes, and then applies, power to the compressor to make sure the pressure switch operates to control the compressor. The test assures the compressor, the relay and the switch at the service panel are serviceable.
B. References
(1) AMM 38-15-60/201, Water System Pressurization
C. Access
(1) Location Zone 124 Forward Cargo Container Compartment, Aft Half, Right
D. Procedure
S 862-023
(1)
Supply electrical power (AMM 24-22-00/201)
S 862-017
(2)
Do this task: "Water System Depressurization (AMM 38-15-60/201).
S 012-018
(3)
Do the "Containerized Cargo Compartment Ceiling and Sidewall Linings Removal" task (AMM 25-52-01/401) to remove the RH upper 12 inches of the vertical sidewall panels between stations 840 and 860.
S 862-024
(4)
Do the "Containerized Cargo Compartment Ceiling and Sidewall Linings Removal" task (AMM 25-52-01/401) to remove the ceiling panels adjacent to the sieewall panels that you removed.
S 862-026
(5)
Remove the DO-NOT-CLOSE tags and close these circuit breakers on P414 Power Distribution Panel - Left:
(a)
414E18 POTABLE WATER VALVES
(b)
414R21 WATER SYS AIR COMPRESSOR
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. FREIGHTERS ú
38-15-67
ú ú 01 Page 204 ú Feb 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 712-019
(6) Make sure the air compressor operates. (a) If the air compressor does not operate, do the steps that replace the pressure switch.
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