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A
747-400 MAINTENANCE MANUAL
S 984-048
(7) Manually close the pressure regulating and shutoff valve.
E. Put the Airplane to its Initial Condition
S 864-049
(1)
Remove pneumatic power (AMM 36-00-00/201).
S 444-050
(2)
Return the thrust reversers to their initial condition
(AMM 78-31-00/201).
S 864-051
(3)
Remove electrical power (AMM 24-22-00/201).
S 984-052
(4)
Unlock the engine anti-ice valve and set it to the closed position.
S 414-056
(5)
AIRPLANES WITH ACCESS DOOR ON THE FORWARD FAIRING;
Close the TAI access door.
S 404-057
(6)
AIRPLANES WITHOUT ACCESS DOOR ON THE FORWARD FAIRING; Install No. 2 and No. 3 forward fairings (AMM 54-62-04/401).
S 864-027
(7)
Close this circuit breaker on the P6 Main Power Distribution Panel
for the applicable engine:
6J10 NACELLE ANTI ICE 1
6J11 NACELLE ANTI ICE 2
6J12 NACELLE ANTI ICE 3
6J13 NACELLE ANTI ICE 4
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747-400 MAINTENANCE MANUAL
ENGINE COWL OVERHEAT SWITCH - REMOVAL/INSTALLATION
__________________________________________________
1. General_______
A. There are two tasks in this subject. There is one task for the removal for the installation of the engine inlet thermal anti-ice (TAI) cowl overheat switch. To remove the switch, it is first necessary to remove the sealant from the switch.
B. The procedure is the same for each engine.
TASK 30-21-05-004-001
2. Engine Cowl Overheat Switch Removal (Fig. 401)___________________________________
A. References
(1)
SSM 30-21-01, SSM 30-21-02, SSM 30-21-03, SSM 30-21-04
(2)
WDM 30-21-12, WDM 30-21-22, WDM 30-21-32, WDM 30-21-42
FAN COWL SUPPORT BEAM
SEE A A
A
NUT CONNECTOR ELECTRICAL SWITCH OVERHEAT ENGINE COWL
WASHER WASHER A A-A Engine Cowl Overheat Switch Installation Figure 401
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747-400
MAINTENANCE MANUAL
B. Access
(1)
Location Zone 451 Engine 1 - Strut Forward Fairing, Fan Cowl Support Beam 461 Engine 2 - Strut Forward Fairing, Fan Cowl Support Beam 471 Engine 3 - Strut Forward Fairing, Fan Cowl Support Beam 481 Engine 4 - Strut Forward Fairing, Fan Cowl Support Beam
(2)
Access Panel
414 Engine 1 - Right Fan Cowl Panel
424 Engine 2 - Right Fan Cowl Panel
434 Engine 3 - Right Fan Cowl Panel
444 Engine 4 - Right Fan Cowl Panel
C. Procedure
S 864-002
(1)
Set the applicable NACELLE ANTI-ICE switch on the anti-ice/rain removal module (P5 panel) to the off position.
S 864-003
(2)
Open this circuit breaker on the P6, Main Power Distribution Panel for the applicable engine:
6J10 NACELLE ANTI-ICE 1
6J11 NACELLE ANTI-ICE 2
6J12 NACELLE ANTI-ICE 3
6J13 NACELLE ANTI-ICE 4
S 014-004
(3)
Open the right fan cowl panel 414, 424, 434, or 444 for the applicable engine.
S 024-005
(4)
Remove the engine cowl overheat switch:
(a)
Disconnect the electrical connector from the applicable engine cowl overheat switch:
DS1626 - Engine 1
DS1627 - Engine 2
DS1628 - Engine 3
DS1629 - Engine 4
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