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21-58-09
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A
747-400
MAINTENANCE MANUAL
DIFFERENTIAL PRESSURE SWITCH SEE A
P414 P514 P614 EXHAUST (REF)
BONDING JUMPER
ELECTRICAL
CONNECTOR
STUDS (3 PLACES)
E1/E2 RACK
PLENUM (REF)
A
E2 RACK (REF)
E1 RACK
(REF)
DIFFERENTIAL PRESSURE SWITCH
ELBOW
COUPLING NUT/O-RING
MOUNTING PLATE
AFT
PRESSURE SENSE LINE
Differential Pressure Switch - Installation
Figure 401
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A
747-400 MAINTENANCE MANUAL
S 034-009
(5)
Remove the nuts and the washers from the mounting plate.
S 024-010
(6)
Remove the switch.
TASK 21-58-09-404-011
3. Differential Pressure Switch Installation (Fig. 401)_________________________________________
A. References
(1)
IPC 21-58-09 Fig. 1
(2)
WDM 21-58-19
(3)
SSM 21-58-02
B. Access
(1) Location Zone 117 Electrical and Electronics Compartment ,LH
C. Install the Switch
S 424-021
(1) Put the switch in its position at the top of the E1/E2 rack.
(a) Make sure you align the studs with the holes in the mounting bracket.
S 434-013
(2)
Install the washers and the nuts on the studs.
(3)
Put a new O-ring on the elbow reducer.
S 434-016
(4)
Install the coupling nut, the O-ring, and the elbow reducer on the switch.
(5)
Connect the pressure sense line to the elbow reducer.
S 434-020
S 434-017
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A
747-400 MAINTENANCE MANUAL
S 434-022
(6)
Connect the bonding jumper to the switch.
S 434-023
(7)
Connect the electrical connector, DS1981, to the switch.
D. Put the Airplane to Its Usual Condition
S 864-019
(1) Remove the DO-NOT-OPERATE tag from the EQUIP COOLING selector, on the P5 panel.
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747-400 MAINTENANCE MANUAL
EQUIPMENT COOLING AIR CLEANER - MAINTENANCE PRACTICES
_____________________________________________________
1. General_______
A. This procedure has instructions to do the tasks that follow:
(1)
Equipment Cooling Air Cleaner Cleaning
(2)
Equipment Cooling Air Cleaner Removal
(3)
Equipment Cooling Air Cleaner Installation
B. The air cleaner for the equipment cooling system is installed in the left sidewall panel of the forward cargo compartment.
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