AFT Cargo Compartment Heating - Electrical Schematic
Figure 003
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AFT Cargo Compartment Heating - Electrical Schematic
Figure 003A
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Aft Cargo Compartment Heating - Electrical Schematic
Figure 003B
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5. Component Description
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A. Temperature Sensors (Ref. Fig. 004) The AFT cargo-compartment duct temperature-sensor 13HC is installed in the inlet duct. The AFT cargo-compartment temperature-sensor 14HC is installed in a housing in the compartment ceiling. Each sensor consists of a stainless-steel housing that contains a thermistor and is surrounded with a ventilated shield. An electrical connector is installed to connect the thermistor to the wiring of controller 10HC.
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Post SB 21-1141 For A/C 001-049,051-099,101-105,151-199,201-213,
A. Temperature Sensors (Ref. Fig. 004) The AFT cargo-compartment duct temperature-sensor 13HC is installed in the inlet duct. The AFT cargo-compartment temperature-sensor 14HC is installed at the extraction duct. Each sensor consists of a stainless-steel housing that contains a thermistor and is surrounded with a ventilated shield. An electrical connector is installed to connect the thermistor to the wiring of controller 10HC.
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B. Temperature Selector (Ref. Fig. 005) The temperature selector 15HC for the AFT cargo compartment is installed on the CARGO HEAT panel 22VU in the cockpit. The selector consists of a rotary potentiometer which is contained inside a metal housing. An electrical connector, attached to the base of the housing, connects the potentiometer to the electrical wiring of the heating controller. The temperature range that the selector can set is between 5 DEG.C (41.00 DEG.F) and 26 DEG.C (78.80 DEG.F) with 15.5 DEG.C (59.90 DEG.F) at the 12 o'clock position. However, if the temperature is, for example, already 15 DEG.C (59.00 DEG.F), the adjusting range lies between 15 DEG.C (59.00 DEG.F) and 26 DEG.C (78.80 DEG.F). The temperature selector is electrically connected to the controller 10HC for temperature control functions.
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AFT Cargo-Compartment Duct Temperature-Sensor Figure 004
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Temperature Selector and Hot-Air Switch Figure 005
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C. Trim-Air Valve (Ref. Fig. 006) A hot trim-air valve 12HC is installed in the trim air supply duct to the AFT cargo compartment. This valve is made from light alloy and is of the butterfly type. A stepper-motor drives a center shaft (to which the butterfly valve is attached) through reduction gears. The valve also has mechanical stops and limit switches. The limit switches stop the valve opening or closing more than their preset position and the mechanical stops are a backup. A manual override and a visual position-indicator are installed on the end of the shaft. The step counter of the controller 10HC counts the steps of the stepper motor to calculate the position of the valve butterfly for indication on ECAM. A return spring closes the trim-air valve 12HC if the power supply or the controller 10HC do not operate.
D. Heating Controller (Ref. Fig. 007) The AFT cargo-compartment heating-system has its own controller 10HC. The controller is a 1 MCU box which is installed in the avionics compartment, in rack 96VU. The function of the controller is to regulate the temperature in the AFT cargo compartment to preselected values. The required temperature is selected with the temperature selector 15HC, which is installed on the cockpit overhead panel 22VU. The controller also sends signals to the CFDS and ECAM via the ARINC 429 data bus. The controller's circuits are fully digital and include BITE. If the variable control function of the controller does not operate, the trim-air valve 12HC and the pressure regulating valve 11HC will close. This is done independently of the controller.
E. Pressure Regulating-Valve (Ref. Fig. 008) The pressure regulating valve (11HC) is used to control the pressure of the hot trim air supply to 4 psi above cabin pressure. The secondary function is to provide a shut-off facility to the aft cargo compartment. This butterfly type valve is under normal conditions actuated by a pneumatic actuator and controlled by a regulator. The valve is activated when the solenoid is energized. The valve can be operated manually and includes a visual position indicator. A limit switch indicates closed/not closed to the zone controller (8HK) and to the ECAM system. When the solenoid is energized, chamber C1 is subjected to upstream pressure through the restrictor G1. Chamber C2 is vented to the downstream pressure through the restrictor G2 and the open poppet valve
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