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CHAPTER 7

ENVIRONMENTAL CONTROL SYSTEM

7.1.

Identify the sections of the ventilation and defog systems and state how their associated components work to provide ram air ventilation and defogging.

1.

Grill:  Keeps FOD out of system

2.

Flapper Valve:Allows outside airflow to enter cockpit, controlled by bent control knob.

3.

Axial Blower:  Controlled by DEFOG Blower CB type switch located on overhead console.

4.

Defroster Nozzle:  Directs air from blower to windscreen.

5.

Bent Control Knobs:  Controls flapper valve, 2 on either side of center console.

Defog works:

1.

With both Bent Control Knobs Pulled out all the way.

2.

(BEST) Close vent Control Knobs and turn on A/C or heat with defog blower on.

7.2.

Identify the major components of the vapor cycle air conditioner and state how they work independently and together to provide cabin air cooling.

1.

Switch panel:  Contains 2 switches  (Air conditioner On / OFF and fan HI / LOW) and a temperature rheostat.

2.

Compressor:  Increases pressure of FREON gas.

3.

Cools freon gas and changes it from a gas to a liquid.

4.

Condenser Blower:  Blows air through condenser to cool the freon.

5.

Evaporator: Changes freon liquid to a gas thereby absorbing all the heat from the surrounding area.

6.

Evaporator Blower:  Blows cabin air through evaporator to cool it.  

NOTE: System requires about 5 HP to operate.

7.3.

Identify the major components of the bleed air heater system in the new B and C, and state how these components warm the cabin air.

1.

Heater Silencer:  Mixes bleed air and cabin air.

2.

Control Valve:  Valve overhead pilot’s seat governs the control air.

3.

Regulator Valve:  Controlled by control air.  Allows bleed air to enter heating system.

4.

Evaporator Fan:  Circulates the air

5.

Duct Temp Switch:  Activates Caution light when Temp in duct becomes excessive.

7.3.1.

Identify the operational procedures associated with monitoring system temperatures.

When Caution light Illuminates: (Heater Malfunction – Duct too Hot)

Procedures:

1.

CABIN HEAT VALVEOFF

2.

AIR COND/FAN switchFAN

3.

HI/FAN/LO switchHI

If light extinguishes:

4.

Continue flight.

If light does not extinguish:

5.Land as soon as possible

20

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