The temperature sensor is in the distribution duct downstream of the precooler in the engine strut.
Physical Description
The temperature sensor is a dual sensor. Internally it has two separate sensing elements (not shown). The sensor has a housing and an electrical connector.
Training Information Point
For the left temperature sensor, you remove access panel 433AL on the strut to gain access. For the right temperature sensor, you remove access panel 443AL on the strut to gain access.
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INDICATING SYSTEM -MANIFOLD DUAL TEMPERATURE SENSOR
EFFECTIVITY BEJ ALL 36-20-00
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INDICATING SYSTEM -FUNCTIONAL DESCRIPTION
General
The ASCPC gives indications about the pneumatic system and its components. The ASCPC also give indications about the air conditioning packs to the cabin temperature controllers (CTC).
The digital (primary) mode of the ASCPC uses these sensors to monitor the system for control and indication purposes:
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Manifold pressure sensor (PM)
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Manifold flow sensor (FS)
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Manifold dual temperature sensor (sensor element TM2)
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Pack flow sensor (ASCPC pack inlet differential pressure sensor)
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ASCPC compressor discharge temperature sensor
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ASCPC pack discharge temperature sensor.
See the pack flow control section for more information on pack flow indication and control (SECTION 21-51).
See the pack cooling and mix manifold temperature control section for more information on pack cooling and mix manifold temperature indication and control (SECTION 21-52).
The analog (backup) mode of the ASCPC uses these sensors to monitor the system for control and indication purposes:
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Manifold dual temperature sensor (sensor element TM1)
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Intermediate pressure (IP) sensor.
EFFECTIVITY
BEJ ALL
Information monitored by the backup mode goes to the primary mode through an internal ASCPC interface.
The primary mode of the ASCPCs monitor valve positions through RVDTs in these valves:
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Left isolation valve
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Center isolation valve
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Right isolation valve
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APU shutoff valve (APU SOV)
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Left fan air modulating valve (FAMV)
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Right fan air modulating valve (FAMV).
Indications
The primary mode of the ASCPCs send signals to the AIMS two ways, directly and through the ARINC 629 buses. The AIMS shows information in these places:
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Air synoptic display -valve position and duct pressure
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Air supply maintenance page -valve position, pressure, temperature and air flow rates
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Ice protection maintenance page -duct pressure
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EICAS display -messages and duct pressure
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Secondary engine display -duct pressure
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Status display -messages
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Performance maintenance page -duct pressure.
The backup mode of the ASCPCs send signals to the AIMS directly. The AIMS shows a message on EICAS for an engine bleed air off condition.
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INDICATING SYSTEM -FUNCTIONAL DESCRIPTION
EICAS advisory messages show when any of these conditions occur:
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An isolation valve not in the commanded position or a bleed isolation switch is set to out
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APU SOV not in the commanded position or APU bleed switch is set to out
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Left PRSOV is close for non-normal condition(s)
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Right PRSOV is close for non-normal condition(s).
Status messages show when any of these conditions occur:
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ASCPC incompatible software
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ASCPC primary mode failure
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Isolation valve failure
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APU SOV failure
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HPSOV failure
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PRSOV failure
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FAMV failure
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Manifold dual temperature sensor failure
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Manifold pressure sensor failure
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Manifold flow sensor failure
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Intermediate pressure sensor failure
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ASCPC pack inlet differential pressure sensor failure
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ASCPC compressor discharge temperature sensor failure
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ASCPC pack discharge temperature sensor failure.
See the pneumatic section for more information on conditions that cause messages related to the pneumatic system operation (SECTION 36-00). 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：777 AMM 飞机维护手册 气源 Pneumatic(33)
