TASK 26-23-00-715-348
 3.  Operational Test - Bottle Pressure Switch_________________________________________
 A. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AIPC 26-23-11, Fig. 1

 (3)  
WDM 26-23-11 thru WDM 26-23-12

 (4)  
SSM 26-23-01

 B.
Access

 (1)  
Location Zones 124 Forward Cargo Container Compartment Aft Half 142 Aft Cargo Container Compartment R.H. 221 Control Cabin, LH 222 Control Cabin, RH

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 C.

D.
E.
A
747-400 MAINTENANCE MANUAL
Prepare for the Test
 S 865-350
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-351

 (2)  
Do the "Put the Air/Ground Relay System Back in the Ground Mode"

 task (AMM 32-09-02/201).Bottle A Pressure Switch Test
 S 865-352
 (1)  
At the cargo fire extinguisher bottle A M7906, push and hold the manual override button on the pressure switch casing.

 S 735-045

 (2)  
Make sure the DISCH light on the fire control module M7326 on the pilot's overhead maintenance panel P5 comes on.

 S 735-284

 (3)  
Make sure the status message "BLT LOW CARGO A" and the advisory message ">CGO BTL DISCH" show on the EICAS.

 S 865-048

 (4)  
Release the manual override button.

 S 735-049

 (5)  
Make sure the DISCH light on the fire control module M7326 (P5) goes off.

 S 735-050

 (6)  
Make sure the advisory and status messages do not show on the EICAS

 screen.Bottle B Pressure Switch Test
 S 865-052
 (1)  
At cargo fire extinguisher bottle B M7907, push and hold the manual override button on the pressure switch casing.

 S 735-053

 (2)  
Make sure the DISCH light on the fire control module M7326 (P5) comes on.

 S 735-273

 (3)  
Make sure the status message "BTL LOW CARGO B", and the advisory message ">CGO BTL DISCH" show on the EICAS.

 (4)  
Release the manual override button.

 S 865-056
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 735-057
 (5)  
Make sure the DISCH light on the fire control module M7326 (P5) goes off.

 S 735-058

 (6)  
Make sure the advisory and status messages do not show on the EICAS screen.

 F.
Bottle C Pressure Switch Test

 S 865-060
 (1)  
At cargo fire extinguisher bottle C M7908, push and hold the manual override button on the pressure switch casing.

 S 735-061

 (2)  
Make sure the DISCH light on the fire control module M7326 (P5) comes on.

 S 735-272

 (3)  
Make sure the status message "BTL LOW CARGO C", and the advisory message ">CGO BTL DISCH" shows on the EICAS.

 S 865-064

 (4)  
Release the manual override button.

 S 735-065

 (5)  
Make sure the DISCH light on the fire control module M7326 (P5) goes off.

 S 735-066

 (6)  
Make sure the advisory and status messages do not show on the EICAS screen.

 G.
Bottle D Pressure Switch Test

 S 865-068
 (1)  
At cargo fire extinguisher bottle D M6742, push and hold the manual override button on the pressure switch casing.

 S 735-069

 (2)  
Make sure the DISCH light on the fire control module M7326 (P5) comes on.

 S 735-271

 (3)  
Make sure the status message "BTL LOW CARGO D", and the advisory ">CGO BTL DISCH" show on the EICAS.
　
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