GCB TRIP
LEFT ENGINE FIRE RIGHT ENGINE FIRE
SWITCH SWITCH

L SQUIB  FIRE EXTBOTTLE 1ENGINE FIRE CONTROL PANEL
Engine Fire Extinguishing Schematic
Figure 2

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757
MAINTENANCE MANUAL

 B. Engine Fire Extinguishing System Test
 (1)  
Squib Test

 (a)  The squib test control panel checks the integrity of extinguisher bottle squibs. Pressing the TEST switch applies current limited power to the extinguisher bottle squib discharge cartridge. If the squibs are good, the green ENG L/R (1 and 2) lights on the panel will come on.

 (2)  
Pressure Switch Test

 (a)  Manually activating the bottle pressure switch tests discharge light circuit continuity. When the hex-key assembly is turned clockwise, the amber ENG BTL 1 or 2 DISCH light comes on and an ENG BTL 1 or 2 DISCH message appears on the EICAS display indicating a successful test.
 C. Control
 (1)  
Provide electrical power (AMM 24-22-00/201)

 (2)  
To place the system in operation, check that the following circuit breakers on main power distribution panel P6 are closed:

 (a)  
FIRE EXTINGUISHING ENG L BTL 1

 (b)  
FIRE EXTINGUISHING ENG L BTL 2

 (c)  
FIRE EXTINGUISHING ENG R BTL 1

 (d)  
FIRE EXTINGUISHING ENG R BTL 2

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757 FAULT ISOLATION/MAINT MANUAL
ENGINE FIRE EXTINGUISHING SYSTEM
COMPONENT SHT 102 FIG.  QTY  ACCESS/AREA  REFERENCE AMM 
BOTTLE - DISCH/CARTRIDGE ENG FIRE EXTINGUISH-ING, B17,B18 CIRCUIT BREAKER - -- 2 821, FWD CARGO COMPT FLT COMPT, P6  26-21-01
 FIRE EXTINGUISHING ENG L BTL 1, C778 1  6H1  *
 FIRE EXTINGUISHING ENG L BTL 2, C786 1  6H2  *
 FIRE EXTINGUISHING ENG R BTL 1, C779 1  6H3  *
 FIRE EXTINGUISHING ENG R BTL 2, C787 EICAS L, M10181 EICAS R, M10182 COMPUTER - (FIM 31-41-00/101)  1  6H4  *
LIGHT - ENG BTL 1 DISCH, YQNL2  -- 1  FLT COMPT, ENGINE FIRE CONTROL PANEL, M10443  * 
LIGHT - ENG BTL 2 DISCH, YQNL4 -- 1 FLT COMPT, ENGINE FIRE CONTROL PANEL, M10443  * 
LIGHT - L ENG 1, YQML1 -- 1 FLT COMPT, SQUIB TEST CONTROL PANEL, M10401  * 
LIGHT - L ENG 2, YQML2  -- 1 FLT COMPT, SQUIB TEST CONTROL PANEL, M10401  * 
LIGHT - R ENG 1, YQML3  -- 1 FLT COMPT, SQUIB TEST CONTROL PANEL, M10401  * 
ENGINE FIRE CONTROL, M10443 LIGHT - R ENG 2, YQML4 PANEL - (FIM 26-11-00/101)  ---- 1 FLT COMPT, SQUIB TEST CONTROL PANEL, M10401  * 
PANEL - SQUIB TEST CONTROL, M10401  -- 1  FLT COMPT, P61  26-21-04 
SWITCH - LEFT ENGINE FIRE, YQNS37  -- 1  FLT COMPT, ENGINE FIRE CONTROL PANEL, M10443  26-21-02 
SWITCH - RIGHT ENGINE FIRE, YQNS38  -- 1  FLT COMPT, ENGINE FIRE CONTROL PANEL, M10443  26-21-02 
SWITCH - TEST 1, YQMS1  -- 1 FLT COMPT, SQUIB TEST CONTROL M10401  * 

* SEE WM EQUIPMENT LIST
Engine Fire Extinguishing System - Component Index
Figure 101

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757 FAULT ISOLATION/MAINT MANUAL
SQUIB TEST CONTROL PANEL, M10401
　
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