Door Control Switches Installation
Figure 401
B26941
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A
747-400 MAINTENANCE MANUAL
C. Prepare For Installation
S 864-005
(1)
Make sure these circuit breakers are open with the DO-NOT-CLOSE tags attached:
(a)
On the Auxilary External 2 Power Center-Right panel P715: 1) NOSE CARGO DOOR
(b)
On the Power Distribution Center-Right panel P415: 1) 415F16, NOSE CARGO DOOR CONTROL
(c)
On the Nose Cargo Door Power panel H122:
1) DOOR LIFT
2) PULL UP CAM
3) LATCHES 1-4R
4) LATCHES 1-4L
5) LATCHES 5-8R
6) LATCHES 1-4L
D.
Procedure
S 424-006
(1)
Install the switch in the control panel and connect the electrical wires.
S 434-007
(2)
Install the panel with screws.
S 714-008
(3)
Do an operational test for the switch (AMM 52-31-00/201).
E.
Put The Airplane Back To Its Usual Condition
S 864-009
(1)
Make sure to remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a)
On the Auxilary External 2 Power Center-Right panel P715: 1) NOSE CARGO DOOR
(b)
On the Power Distribution Center-Right panel P415: 1) 415F16, NOSE CARGO DOOR CONTROL
(c)
On the Nose Cargo Door Power panel H122:
1) DOOR LIFT
2) PULL UP CAM
3) LATCHES 1-4R
4) LATCHES 1-4L
5) LATCHES 5-8R
6) LATCHES 1-4L
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S 864-010
(2) Remove electrical power, if it is not necessary (AMM 24-22-00/201).
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PRESSURE SWITCH AND ISOLATION RELAY PANEL - REMOVAL/INSTALLATION
________________________________________________________________
1. General_______
A. This procedure has two tasks:
(1)
The removal of the pressure switch and isolation relay
(2)
The installation of the pressure switch and isolation relay
TASK 52-31-21-004-001
2. Pressure Switch and Isolation Relay Removal (Fig. 401)___________________________________________
A. Access
(1)
Location Zones
801 Nose Cargo Door
B.
Pressure Switch Removal
S 864-002
(1)
Open this circuit breaker and attach the DO-NOT-CLOSE tag:
(a)
On the Power Distribution Center-Right panel P415: 1) 415F16, NOSE CARGO DOOR CONTROL
S 014-003
(2)
Remove the cover from the panel.
S 034-004
(3)
Disconnect the electrical connector from the pressure switch.
S 034-005
(4)
Disconnect the No. 2 connector for the auxiliary static system.
S 034-006
(5)
Remove the mounting screws and the switch.
C.
Isolation Relay Removal
S 864-007
(1)
Make sure this circuit breaker is open with the DO-NOT-CLOSE tag attached:
(a)
On the Power Distribution Center-Right panel P415: 1) 415F16, NOSE CARGO DOOR CONTROL
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