(2)
Install the four screws that hold the switch to the ejector.

 S 424-030

 (3)  
Connect the electrical connector, DS2259 or DS2275, to the pressure switch.

 S 434-013

 (4)  
Connect the vacuum sense line to the pressure switch and the ejector.

 S 434-011
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A 747-400 MAINTENANCE MANUAL
 S 864-014
 (5)  Remove the DO-NOT-CLOSE tags and close these circuit breakers: (a) P7 Overhead Circuit Breaker Panel 1) 7H14, CARGO SMOKE DETECT LWR A 2) 7H15, CARGO SMOKE DETECT LWR B
 S 724-046
 (6)  Pressurize the pneumatic crossover duct to a minimum of 20 inches of water (1.5 inches of mercury) (AMM 36-00-00/201). (a) Make sure the pneumatic crossover duct is pressurized.
 S 864-041
 (7)  Open 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 2 (e) 6G19, STDBY ING ENG 1 (f) 6G22, STDBY ING 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
 S 864-047
 (8)  Close these circuit breakers on the P6 panel: (a) 6L11, FUEL CONT VALVE ENG 2 (b) 6L12, FUEL CONT VALVE ENG 3
 S 864-048
 (9)  Set 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 message 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 864-049
 (10) After 5 minutes do the following step:
 (a)  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 794-019
 (11)
 Visually make sure there are no air leaks in the plumbing connections or the ejector.

 S 864-020

 (12)
 Remove electrical power if it is not necessary (AMM 24-22-00/201).

 (13)
 Remove pneumatic power if it is not necessary (AMM 36-00-00/201).

 S 864-026
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 LOWER CARGO COMPARTMENT SMOKE DETECTION TUBING - INSPECTION/CHECK
_________________________________________________________________
 1.  General_______
 A.  This section includes an inspection/check procedure of the lower cargo compartment smoke detection tubing manifolds.
 B.  The tubing can be accessed through the lower cargo compartment access door.
 TASK 26-16-05-216-008
 2.  Check the Smoke Sampling Orifices_________________________________
 A.  References
 (1)  
26-16-05/701, Lower Cargo Compartment Smoke Detection Tubing

 (2)  
IPC 26-16-55-01 Fig.1

 (3)  
IPC 26-16-56-01 Fig.1

 B.  Access
 (1)  Location Zone 122 Forward Cargo Container Compartment Forward Half RH 142 Aft Cargo Compartment RH 146 Bulk Cargo Compartment RH
　
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