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* EXT TEST lights come on after you do a successful squib
continuity test.
Operation Controls
These are the controls on the engine and APU fire control panel:
FIRE PROTECTION - ENGINE FIRE EXTINGUISHING - OVERHEAT/FIRE PROTECTION PANEL
EFFECTIVITY
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* Fire handle switches show fire indication and control fire
extinguisher squibs
* TEST switch lets you to do two tests. One test is for the fault
detection circuits. The other test is for the fire detector loops
* OVHT DET switches let you select the mode of operation,
loop A or loop B. You may also select NORMAL for both
loops
* EXT TEST switch lets you do a check of the extinguisher
bottle squibs for continuity.
FIRE PROTECTION - ENGINE FIRE EXTINGUISHING - OVERHEAT/FIRE PROTECTION PANEL
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
26-21-00-020
FIRE PROTECTION - ENGINE FIRE EXTINGUISHING - OVERHEAT/FIRE PROTECTION PANEL
FIRE PROTECTION - ENGINE FIRE EXTINGUISHING - OVERHEAT/FIRE PROTECTION PANEL
EFFECTIVITY
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26-21-00-020
Functional Description
When there is an overheat or fire condition, the related engine
fire handle switch on the engine and APU fire control panel
unlocks. You can also use the manual override under the
handle to unlock the fire warning switch. When you pull the
switch up, these functions occur:
* High pressure fuel valve in HMU closes
* Spar fuel valve closes
* Thrust reverser control power goes off
* Engine driven hydraulic pump shutoff valve closes
* Hydraulic system low pressure indication inhibited
* Pneumatic pressure regulating and shutoff valve closes
* Generator trips off.
When you turn the engine 1 fire handle switch clockwise, 28v dc
goes to the R bottle dual squib 1. This releases halon which
goes from the bottle to engine 1. If you turn the same engine fire
handle switch counter-clockwise, 28v dc goes to the L bottle
dual squib 1. This releases halon which goes from the bottle to
engine 1.
When an engine fire extinguisher bottle pressure is less than
250 psi, the bottle pressure switch closes. The related BOTTLE
DISCHARGED amber light on the overheat/fire protection panel
comes on.
The engine 2 fire extinguishing system operates the same as
engine 1. The difference is that the engine 2 fire warning switch
sends 28v dc to the R or L bottle squib 2.
FIRE PROTECTION - ENGINE FIRE EXTINGUISHING - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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26-21-00-025
FIRE PROTECTION - ENGINE FIRE EXTINGUISHING - FUNCTIONAL DESCRIPTION
FIRE PROTECTION - ENGINE FIRE EXTINGUISHING - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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Purpose
The engine and APU fire extinguisher test does a check for fire
extinguisher bottle squib continuity. This test makes sure squib
servicing is not necessary.
Physical Description
The engine and APU fire extinguisher test uses these
components:
* Three-position toggle switch, spring loaded to the neutral
position
* L bottle test green light comes on
* R bottle test green light comes on
* APU bottle test green light comes on.
Location
The engine and APU fire extinguisher test switch and three
green lights are on the engine and APU fire control panel.
Operation
When you set the EXT TEST switch to the 1 position, a test of
these squibs occurs:
* L bottle number 1 squib
* R bottle number 1 squib
* APU bottle squib.
When you set the EXT TEST switch to the 2 position, a test of
these squibs occurs:
* L bottle number 2 squib
* R bottle number 2 squib
* APU bottle squib.
The green test lights come on to show a successful test.
NOTE: You test the same APU bottle squib with the switch in
　
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