747-400 AMM 飞机维护手册 防火 FIRE PROTECTION 1(119)

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 (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 865-295
 (13) Close the shutoff valve in-line with the ejector plenum completely.
 (a)  Make sure the vacuum gauge pressure goes to zero.
 NOTE: If the pressure does not go to zero, disconnect the
____ line between the pressure switch on the ejector mounting plate and the vacuum gauge. Bleed the pressure to zero at the pressure switch. Connect the line after the pressure goes to zero.
 S 725-208
 (14)
 Make sure the EICAS advisory message CARGO DET AIR and EICAS status message CARGO DET AIR LL1 show.

 S 865-161

 (15)
 Open the shutoff valve in-line with the ejector plenum completely to pressurize the vacuum switch.

 (16)
 Make sure the EICAS advisory message, CARGO DET AIR, does not show.

 S 725-162
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747-400 MAINTENANCE MANUAL
 S 865-165
 (17) Close the shutoff valve in-line with the ejector plenum completely to remove the pressure from the vacuum switch.
 NOTE: If the pressure does not go to zero, disconnect the
____ line between the pressure switch on the ejector mounting plate and the vacuum gauge. Bleed the pressure to zero at the pressure switch. Connect the line after the pressure goes to zero.
 S 725-166
 (18)
 Make sure the EICAS advisory message, CARGO DET AIR, shows.

 S 865-167

 (19)
 Close these circuit breakers on the P6 panel:

 (a)
6L10, FUEL CONT VALVE ENG 1

 (b)
6L13, FUEL CONT VALVE ENG 4

 

 S 865-218
 (20)
 Set the fuel control switches for engines 1 and 4 to the CUTOFF position.

 S 725-168

 (21)
 Make sure the EICAS advisory message, CARGO DET AIR, does not show.

 S 865-298

 (22)
 Release the pressure from the pneumatic crossover duct or the alternative pressure source (AMM 36-00-00/201).

 NOTE: If you used an alternative air source, remove the air source.
____ Connect the hoses at STA 970 and 1530. Torque the 3/4 " nut on the bleed air inlet to the ejector from 428 to 472 in-lbs. and make a mark on it.
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 ALL  ú ú 11 Page 520 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 035-046
 (23)
 Disconnect the vacuum gauge between the ejector and the pressure switch.

 S 865-103

 (24)
 Push the MENU key on the center CDU.

 S 865-104

 (25)
 Push the line select key adjacent the the CMC prompt.

 S 865-105

 (26)
 Push the line select key adjacent to the the PRESENT LEG FAULTS prompt on the CDU.

 S 865-214

 (27)
 Push the NEXT PAGE key on the CDU until CARGO DET AIR LL1 shows.

 S 865-209

 (28)
 Push the line select key adjacent to the ERASE prompt on the same line as CARGO DET AIR LL1.

 S 865-216

 (29)
 Make sure the EICAS status message, CARGO DET AIR LL1, does not show.

 S 435-047

 (30)
 Connect the vacuum sense line between the ejector body and the pressure switch.

 S 865-173

 (31)
 Close these circuit breakers on the P6 panel:

 (a)  
6F1, IGN 1 ENG 1

 (b)  
6G4, 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)  
　
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