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personnel.
Before power is spplied to the aircraft make certain
that electrical circuits upon which work is in progress
are isolated.
Discharge cartridges are class "c" explosives and must
be handled/stored by authorized personnel or disposed
of by an approved method.
Wuen cartridge electrical connectors are disconnected
the cartridge electrical pins must be shunted with a
protective shunt which is provided by the manufacturer.
A shunt plug or shorting clip will prevent bottle
discharge which could cause injury to maintenance
personnel.
The cartridge installed must be of the same make as
the bottle and correspond to the specification
indicated in the Maintenance Manual.
FIRE DETECTOR
IDENTIFICATION
FIN: 21WG, 22WG
LOCATION
ZONE: 316
COMPONENT DESCRIPTION
One per loop.
The detector is pneumatically operated by heating its
sensing element which contains helium gas and an
hydrogen charged core material.
Alarm State
The application of heat to the sensor causes an
increase of the gas pressure which in turn closes the
alarm switch. The detector sends a FIRE signal.
Fault State
In the event of gas pressure loss, the integrity switch
opens and generates a fault signal.
TMUFIRK01-T01 LEVEL 3
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TMUFIRK01-P01 LEVEL 3
APU FIRE PROTECTION: COMPONENTS
EFFECTIVITY 26-13-00 Page 3
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APU FIRE PROTECTION: COMPONENTS
FIRE DETECTION UNIT (FDU)
IDENTIFICATION
FIN: 13WG
LOCATION
ZONE: 126
FIRE BOTTLE
IDENTIFICATION
FIN: 11WF
LOCATION
ZONE: 314
COMPONENT DESCRIPTION
- Type of agent: bromotrifluoromethane.
- Nominal Nitrogen pressure at 21 deg.C: 600 psi.
Pressure Switch
The pressure switch operates at 225 psi.
An allen key can be inserted in the manual test point
in order to check the pressure.
The pressure switch is calibrated at:
- 450 psi when the pressure increases
(refilling).
- 225/275 psi when the pressure decreases
(discharge or leak).
Squib
The squib is an electropyrotechnic cartridge
containing explosive powder fired by two filaments
supplied with 28 VDC.
WARNING: Never check the continuity of the squib using
a conventional ohmmeter.
TMUFIRK01-T02 LEVEL 3
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RED DISC
Is blown out in case of thermal discharge.
TMUFIRK01-T03 LEVEL 3
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THIS PAGE INTENTIONALLY LEFT BLANK
TMUFIRK01 LEVEL 3
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26 - FIRE PROTECTION
26-13-00 APU FIRE PROTECTION: ELECTRICAL
CIRCUITS
CONTENTS:
Detection
Extinguishing
Auto Extinguishing
TMUFIRR01 LEVEL 3
EFFECTIVITY 26-13-00 Page 1
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APU FIRE PROTECTION: ELECTRICAL CIRCUITS - DETECTION
EFFECTIVITY 26-13-00 Page 2
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