B. Trim-Air Valve (Ref. Fig. 010A) The trim-air valve 11HK (12HK, 13HK) consists of an actuator assembly and a valve body assembly. They are bolted together and internally connected. A butterfly valve is driven by a stepper motor through reduction gears which have mechanical end stops. Two cams installed on the shaft, operate limit switches which signal fully open or fully closed to the ACSC. One potentiometer, at the end of the shaft, signals the ACSC's the valve position. The ACSC use this information for BITE and ECAM display. A manual override and visual position indicator device is installed on the bottom of the shaft.
 C. Zone Temperature Sensor (Ref. Fig. 011) There are three zone-temperature sensors 21HK (22HK, 23HK) one installed in the cockpit, fwd cabin and aft cabin zones. Each sensor consists of a ventilated plastic body into which are potted two thermistors. One thermistor supplies the ACSC 1, the other the ACSC 2. Also incorporated is a 6-pin connector.
 D. Duct Temperature Sensor (Ref. Fig. 012) There are three duct-temperature sensors 15HK (16HK, 17HK), one installed in the main supply ducts to the cockpit, fwd cabin and aft cabin zones. Each sensor consists of a ventilated metal body into which are potted two thermistors. One thermistor supplies the lane 1, the other supplies the

 second lane of a ACSC. Each gives control indication and overheat
 detection. Also incorporated is a 6-pin electrical connector.

 E. Mixer Temperature Sensor (Ref. Fig. 013) There are two mixer temperature sensors 24HK (25HK), one installed on each side of the mixer. The cockpit mixer temperature sensor is connected to the ACSC 1 and the cabin mixer temperature sensor is connected to the ACSC 2. Each temperature sensor consists of a ventilated metal body into which are potted two thermistors. One thermistor supplies the lane 1 the other the second lane of the ACSC. Also incorporated is a 6-pin electrical connector.
 F. Zone Temperature Selector (Ref. Fig. 014) There are three zone-temperature selectors 27HK (28HK, 29HK) installed on the AIR COND panel 30VU in the cockpit overhead panel. One selector for the cockpit, fwd cabin and aft cabin zones. Each one consists of a rotary setting potentiometer in a tubular metal housing. The temperature range is between 18 DEG.C (64.40 DEG.F) and 30 DEG.C (86.00 DEG.F) when in the 12 o'clock position the temperature is approx.24 DEG.C (75.20 DEG.F). The temperature selector for the cockpit zone is connected to both lanes of the ACSC 1. The temperature selectors for the cabin zones are connected to both lanes of the ACSC 2.
 G. Trim-Air Pressure Regulating-Valve (Ref. Fig. 015) The Trim-Air Pressure Regulating-Valve (TAPRV) 14HK regulates the pressure of the air which flows to the trim-air valves 11HK (12HK, 13HK). It performs the trim system shut-off function. The valve is a three-inch steel-butterfly type which is pneumatically actuated, and electrically signaled. The function of the valve is to act as an ON/OFF valve for the trim-air system. It also regulates the downstream pressure to a nominal 280 mbar above cabin pressure. A safety function is also included to reduce downstream pressure by about 50 % when any duct temperature goes above 80 DEG.C (176.00 DEG.F). The pressure regulation is controlled pneumatically and two solenoids control the ON/OFF function and the safety function. A limit switch indicates CLOSED/NOT CLOSED to the ACSC and the ECAM system.
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 Trim-Air Pressure Regulating-Valve (14HK)
 Figure 015

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 **ON A/C ALL
 H. Hot-Air Pressure Switch (Ref. Fig. 016) The hot-air pressure switch 26HK is installed downstream of the trim-air pressure regulating-valve 14HK. The pressure switch consists of a housing which contains a hermetically sealed microswitch, a stainless-steel diaphragm, a snap-action disc spring and an electrical connector.The stainless-steel diaphragm when pressurized, exerts a force on the snap-action disc spring. At a predetermined pressure, the disc spring will snap over and depress the microswitch actuator. Falling pressure causes the disc spring to return to the position which allows the microswitch to open.
 J. Check Valve (Ref. Fig. 017) Two check valves 18HM (19HM) are installed upstream of the trim-air pressure regulating-valve 14HK. One is installed in each trim-air duct from pack 1 and pack 2. Two semicircular flaps are installed on a hinge bar and a spring holds the semicircular flaps in the closed position. Airflow through the trim-air supply ducts will lift these semicircular flaps and allow the air to flow through the check valves to the trim-air pressure regulating-valve 14HK. Airflow in the opposite direction will push the flaps back onto their seats and stop the airflow.
　
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