(5)  
Disconnect the pressure supply line.

 S 034-007

 (6)  
Disconnect the rubber tube connection to the main vacuum supply line.

 S 034-008

 (7)  
Remove the four ejector mounting screws.

 S 024-009

 (8)  
Remove the ejector from the mounting brackets.

 TASK 26-16-02-404-010
 3. Install the Ejector (Fig. 401)
___________________
 A. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 36-00-00/201, Pneumatic Systems

 (3)  
AIPC 26-16-05, Fig. 1

 (4)  
WDM 26-16-11 thru WDM 26-16-16

 B. Access
 (1)  Location Zones
 Fwd ejector
 125 Area Below Aft Cargo Container Compartment L.H.
 126 Area Below Aft Cargo Container Compartment R.H.
 Aft ejector
 143 Area Below Aft Cargo Container Compartment L.H.
 144 Area Below Aft Cargo Container Compartment R.H.

 C. Procedure
 S 424-011
 WARNING:_______USE EAR PROTECTION IN THE AFT CARGO COMPARTMENT. THE HIGH NOISE LEVEL OF THE EJECTOR CAN CAUSE INJURY TO PERSONS.
 (1)  
Install the ejector on the mounting brackets with the four ejector mounting screws.

 (2)
Connect the air supply line from the pneumatic crossover duct.

 S 434-013

 (3)  
Attach the rubber tube from the main vacuum supply line to the ejector with the clamps.

 S 434-012
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A 747-400 MAINTENANCE MANUAL
 (4)  S 434-030Attach the electrical connector, DS2275 (fwd ejector) or DS2259 (aft ejector), to the pressure switch.
 (5)  S 864-015Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P7 panel: (a) 7H14, CARGO SMOKE DET, LWR A (b) 7H15, CARGO SMOKE DET, LWR B
 (6)  S 864-016Supply electrical power (AMM 24-22-00/201).
 (7)  S 864-040Open these circuit breakers on the P6 panel: (a) 6F1, IGN 1 ENG 1 (b) 6F4, IGN 1 ENG 4 (c) 6G1, FUEL SHUTOFF VALVE ENG 1 (d) 6G4, FUEL SHUTOFF VALVE ENG 4 (e) 6G19, STBY IGN ENG 1 (f) 6G22, STBY IGN ENG 4 (g) 6J18, ENG START AIR CONT (h) 6K19, IGN 2 ENG 1 (i) 6K22, IGN 2 ENG 4 (j) 6L10, FUEL CONT VALVE ENG 1 (k) 6L13, FUEL CONT VALVE ENG 4
 (8)  S 864-045Close these circuit breakers on the P6 panel: (a) 6L11, FUEL CONT VALVE ENG 2 (b) 6L12, FUEL CONT VALVE ENG 3
 (9)  S 864-046Set the engine fuel control switches on the forward electrical control panel, P9, for engine 1 and 4 in the RUN position.
 NOTE:____ These switches must be in the RUN position for 5 minutes before the EICAS messages in the subsequent steps will show. The engine fuel control switches for engines 2 and 3 must be in the CUTOFF position.

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A
747-400 MAINTENANCE MANUAL
 S 864-047
 (10) After 5 minutes do the steps that follow:
 (a)  Make sure the EICAS CARGO DET AIR advisory and EICAS status message show.
 S 864-018
 (11) Pressurize the pneumatic crossover duct (AMM 36-00-00/201).
 (a)  Make sure the pneumatic crossover duct is pressurized.
 S 864-049
 (12) Make sure the EICAS status message, CARGO DET AIR LL1 and CARGO DET AIR LL2, do not show.
 NOTE: If the EICAS status message, CARGO DET AIR LL1 or
____ CARGO DET AIR LL2 , shows but the EICAS advisory message, CARGO DET AIR, does not show, then the status message is latched from before. Erase the status message and continue the test.
 S 794-021
 (13)
 Visually make sure the plumbing connections are correct and there are no air leaks on the ejector.

 (14)
 Remove electrical power if it is not necessary (AMM 24-22-00/201).

 (15)
 Remove pneumatic power if it is not necessary (AMM 36-00-00/201).
　
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