(2)  
The system tests increase the scope of the operational test to check all performance requirements of the system.

 (3)  
The system tests include these tasks and sections:

 (a)  
Squib Discharge Circuit Test

 (b)  
Bottle Pressure Switch Tests
 1) Bottle A
 2) Bottle B
 3) Bottle C
 4) Bottle D

 (c)  
Non-Metered Discharge Line Test
 1) Forward
 2) Aft

 (d)  
Metered Discharge Line Test
 1) Forward
 2) Aft

 TASK 26-23-00-715-001
 2.  Operational Test - Bottle Squib Circuit (Fig. 501)__________________________________________________
 A.  References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AIPC 26-23-01, Fig. 2

 (3)  
WDM 26-23-11 thru WDM 26-23-12

 (4)  
SSM 26-23-01

 B.  Access
 (1)  Location Zone
 221 Control Cabin, LH
 222 Control Cabin, RH

 C.  Prepare for Test
 S 865-002
 (1)  
Supply the electrical power (AMM 24-22-00/201).

 S 865-003

 (2)  
Close these circuit breakers:

 (a)  P6 Main Power Distribution Panel 1) 6H6 FIRE EXTINGUISHER LOWER CARGO 2) 6L4 FLT DECK LIGHT CAPT IND
 D.  Procedure
 S 865-004
 (1)  At SQUIB TEST MODULE M7327 on P461 pilot's overhead maintenance panel, push and hold the TEST 1 switch.
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747-400
MAINTENANCE MANUAL

SQUIB TEST SWITCHES
ARMING (WHITE) AND  (AMBER)  SQUIB
SMOKE INDICATION (RED)  SWITCH  INDICATION 
SWITCHES  LIGHTS 

Lower Cargo Compartment Fire Extinguishing System - Component Location
Figure 501 (Sheet 1)

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C79811
A

747-400
MAINTENANCE MANUAL

LOWER CARGO FIRE EXTINGUISHER BOTTLES
SEE C
FILLER PORT/ FILLER PORT/ SAFETY RELIEF SAFETY RELIEF (EXAMPLE) (EXAMPLE)
BOTTLE  BOTTLE  BOTTLE  BOTTLE 
D  C  B  A 
(M6742)  (M7908)  (M7907)  (M7906) 

SQUIB ASSEMBLY  GROUND LUG  BOTTLE PRESSURE 
(EXAMPLE)  ASSEMBLY  SWITCH (EXAMPLE) 
(2 PER BOTTLE)  (EXAMPLE) 
LOWER CARGO FIRE EXTINGUISHER BOTTLES 
C 

Lower Cargo Compartment Fire Extinguishing System - Component Location

Figure 501 (Sheet 2)

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747-400 MAINTENANCE MANUAL
 S 745-005
 (2)  
Make sure the cargo squib lights A, B, C, and D come on (green).

 S 865-006

 (3)  
Release the TEST 1 switch.

 S 745-007

 (4)  
Make sure the test lights go off.

 S 865-008

 (5)  
Push and hold the TEST 2 switch.

 S 745-009

 (6)  
Make sure the cargo squib lights A, B, C, and D come on (green).

 S 865-010

 (7)  
Release the TEST 2 switch.

 S 745-011

 (8)  
Make sure the test lights go off.

 S 865-012

 (9)  
Remove the electrical power if it is not necessary (AMM 24-22-00/201).
　
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