Position Sensor
The contactless "Hall" position sensor indicates to the
ACSC whether the FCV is:
-Fully closed (FC)
-Not fully closed (NFC)
DPS and PIP Sensors The ACSC uses information from these two sensors, along with aircraft cabin altitude and bleed air temperature to calculate the actual flow through the FCV. The two sensors are fool proofed to prevent incorrect installation.
Downstream Pressure Limiter The downstream pressure limiter operates in the back-up mode to limit the downstream pressure to a fixed value. This will result in a pneumatically controlled flow.
Solenoid - On/Off
Determines whether the FCV is open or closed:
-
Solenoid energized: FCV open and regulating
-
Solenoid de-energized: FCV closed
Solenoid - Mode Selection The mode selection solenoid determines whether the FCV is operating in the main control mode or the back-up mode.
-
Solenoid energized: back-up mode
-
Solenoid de-energized: main mode
**ON A/C 001-003, 051-054,
B. Pressure Sensor (Ref. Fig. 008) The pressure sensors 10HB (9HB) convert the reference pressure which is equivalent to the airflow through each flow control valve 8HB (11HB) into an electrical signal which is than sent to the pack controller. Each pressure sensor consists of:
-
a high-precision pressure transducer,
-
a measurement amplifier,
-an electrical connector.
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Pressure Sensor Figure 008
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R **ON A/C 004-049, 055-099, 101-149, 151-199, 201-299, 301-399,
B. Pressure Sensor (Ref. Fig. 008A) The pressure sensors 10HB (9HB) measure the difference between the pressure at the inlet of the flow-control-valve venturi and the pressure at its narrowest diameter. This differential pressure is equivalent to the airflow through each flow control valve 8HB (11HB). The sensors measure pressure with a pressure sensitive diaphragm which transfers pressure into an electrical signal. This signal is amplified and then sent to the pack controller. Each sensor consists of:
-
a high-precision pressure transducer,
-
a measurement amplifier,
-an electrical connector.
R **ON A/C 401-499,
B. Differential Pressure Sensor (DPS), Pack Inlet Pressure Sensor (PIPS) The differential pressure sensors 23HB2 (24HB2) measure the pressure difference of the flow at the venturi body. The pressure difference is used for flow calculation. The pack inlet pressure sensors 23HB1 (24HB2) measure the pressure upstream of the venturi. The sensors transfers pressure into an electrical signal. This signal is amplified and then sent to the Air Conditioning System Controller. Each sensor consists of:
-
a high-precision pressure transducer,
-
a measurement amplifier,
-an electrical connector.
**ON A/C ALL
C. Mixer Flap Actuator The mixer flap actuator 20HB operates a flap in the cockpit supply port of the mixer. A thermally protected 28 V DC motor drives the back-up flap through a reduction gearbox. Microswitches inside the mixer flap actuator 20HB prevent override of the flap at each end of its travel. A manual override lever and position indicator (on top of the actuator) make it possible to operate the flap manually.
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Pressure Sensor
Figure 008A
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**ON A/C 001-049, 101-105, 151-199,
D. Ozone Filter (Ref. Fig. 009) The ozone filters 100HM (101HM) are installed upstream of the flow control valves 8HB (11HB). The ozone filters consist of a stainless steel housing with a honeycomb core. This core contains a precious metal for the catalytic removal of ozone from the hot bleed air supplied to the packs 10HM (11HM) and the trim system. The ceramic core is fixed in the housing with a knitted, corrugated wire mesh which prevents damage from vibrations or shocks.
**ON A/C ALL
6. Operation/Control and Indication________________________________
**ON A/C 001-049, 101-105, 151-199,
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