(2)
Remove the cover from the panel.
(3)
Remove the relay.
S 014-008
S 024-009
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A
747-400 MAINTENANCE MANUAL
H122 PANEL
SEE A
MOUNTING SCREW
ISOLATIONPRESSSURE (4 LOCATIONS) RELAY, R1104SWITCH, S110
ELECTRICAL CONNECTOR
PRESSURE SWITCH AND ISOLATION RELAY PANEL
AUXILIARY STATIC
SYSTEM NO. 2 CONNECTOR
CABIN PRESSURE
(BELOW ELECTRICAL CONNECTOR)
PROBE
A
Pressure Switch and Isolation Relay Installation
Figure 401
B26943
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A
747-400
MAINTENANCE MANUAL
TASK 52-31-21-404-010
3. Pressure Switch and Isolation Relay Installation (Fig. 401)
________________________________________________
A. References
(1)
24-22-00/201, Manual Control
(2)
34-11-00/501, Pitot Static System
(3)
52-31-00/201, Nose Cargo Door
B.
Access
(1)
Location Zone
801 Nose Cargo Door
C.
Procedure
S 434-026
(1)
Install the pressure switch with four mounting screws.
S 434-012
(2)
Connect the electrical connector.
S 434-013
(3)
Connect the No. 2 connector for the auxiliary static system.
S 794-014
(4)
Do a leak check for the aux static system No. 2 (Ref 34-11-00/501).
S 414-015
(5)
Install the cover on the panel.
S 864-016
(6)
Close this circuit breaker and remove the DO-NOT-CLOSE tag:
(a)
On the Power Distribution Center-Right panel P415: 1) 415F16, NOSE CARGO DOOR CONTROL
S 864-017
(7)
Supply the electrical power (Ref 24-22-00/201).
S 714-018
(8)
Make sure the latch position indication lights operate correctly (Ref 52-31-00/201).
S 864-019
(9)
Remove the electrical power, if it is not necessary.
D.
Isolation Relay Installation
(1)
Install the relay.
S 424-020
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747-400 MAINTENANCE MANUAL
S 414-021
(2)
Install the cover on the panel.
S 864-022
(3)
Close this circuit breaker and remove the DO-NOT-CLOSE tag:
(a)
On the Power Distribution Center-Right panel P415: 1) 415F16, NOSE CARGO DOOR CONTROL
S 864-023
(4)
Supply electrical power.
S 714-024
(5)
Make sure the latch position indication lights operate correctly (Ref 52-31-00/201).
E.
Put The Airplane Back To Its Usual Condition
(1)
Remove the electrical power if it is not necessary (Ref 24-22-00).
S 864-025
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