(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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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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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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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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