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UF94200
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AVIONICS VENTILATION - COMPONENTS
PRESSURE SWITCHES
IDENTIFICATION
FIN: 17HQ, 19HQ, 30HQ
LOCATION
ZONE: 121, 127, 127
COMPONENT DESCRIPTION
Three pressure switches are installed in the avionics
ventilation system, two in the blowing circuit and one
in the extraction circuit. The switches are of the
capsule/microswitch type with an electrical connector
at the top. A low flow indication is given at a
differential pressure of 1.7 mbar plus 1.3 or minus
0.5 mbar.
TMUVENE0A-T09 LEVEL 3
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AVIONICS VENTILATION - COMPONENTS - PRESSURE SWITCHES
TMUVENE0A-P09 LEVEL 3
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AVIONICS VENTILATION - COMPONENTS
DUCT TEMPERATURE SENSOR
IDENTIFICATION
FIN: 26HQ
LOCATION
ZONE: 128
COMPONENT DESCRIPTION
It consists of a thermistor mounted in a
stainless-steel tube, an electrical connector is
mounted at the top.
The set temperature values are:
- increasing temperatures 62 deg.C +1 deg.C
(143.6 deg.F +1.8 deg.F).
- decreasing temperatures 60 deg.C +1 deg.C (140 deg.F
+1.8 deg.F)
TMUVENE0A-T10 LEVEL 3
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AVIONICS VENTILATION - COMPONENTS - DUCT TEMPERATURE SENSOR
TMUVENE0A-P10 LEVEL 3
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MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
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AVIONICS VENTILATION - COMPONENTS
SKIN TEMPERATURE SENSOR
IDENTIFICATION
FIN: 28HQ
LOCATION
ZONE: 126
COMPONENT DESCRIPTION
It consists of a sensor element through which an
electrical current passes to measure the potential
difference proportional to the temperature. The set
temperature values are as follows:
- on ground, increasing values +7 deg.C (+44.60 deg.F),
decreasing values +4deg.C (+39.20 degF).
- after takeoff, increasing values +36 deg.C
(+96.80 deg.F), decreasing values +31 deg.C
(+87.80 deg.F).
SKIN HEAT EXCHANGER
COMPONENT DESCRIPTION
A skin heat exchanger is located in the upper fuselage
between frames 12 and 14 and, in normal flight
operations, is used to cool the avionics ventilation
air. A thermally insulated internal wall is bolted to
the frames to form two rectangular ducts. This internal
wall is easily removed for structural inspection. A
drainage system is included to deal with any
condensation when the heat exchanger is in operation.
TMUVENE0A-T11 LEVEL 3
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AVIONICS VENTILATION - COMPONENTS - SKIN TEMPERATURE SENSOR - SKIN HEAT EXCHANGER
TMUVENE0A-P11 LEVEL 3
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TMUVENE0A LEVEL 3
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21 - AIR CONDITIONING
21-43-00 FWD CARGO COMPARTMENT
VENTILATION/HEATING -
SYSTEM PRESENTATION
CONTENTS
General
Pressure Regulating Valve (PRV)
Trim Air Valve
Inlet Isolation Valve
Extraction Fan
Outlet Isolation Valve
Pressure Switch
Ventilation Controller
Heating Controller
TMUVE110A LEVEL 1
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FWD CARGO COMPARTMENT VENTILATION/HEATING - SYSTEM PRESENTATION
GENERAL
The FWD cargo compartment ventilation system operates
in two different modes.
　
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