(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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