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CH47F > Environmental systems > Flashcards

Environmental systems Flashcards

1
Q

NOTE associated with HTR HOT caution

A

Since the HTR HOT caution will not extinguish until the temperature in the combustion chamber is below 177°C, it may take several attempts at restarting the heater before the HTR HOT caution deactivates.

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2
Q

Caution associated with windshield wipers

A

To prevent windshield damage, do not operate the windshield wipers when windshields are dry

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3
Q

Caution associated with GROUND CONTACT section

A

Should either or both GROUND CONTACT indicating lights remain illuminated after lift-off, the associated DASH will not function properly in forward flight. If both GROUND CONTACT indicating lights remain illuminated after lift-off, the AUTO function of both cyclic trims system will be inoperative

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4
Q

Caution associated with windshield (w/s) HEAT switches

A

If windshield bubbling or delamination occurs around the sensor element, immediately place the w/s HEAT switch to OFF for that windshield

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5
Q

Explain the Pitot Tubes

A
  • # 1 pitot tubes, supplies differential air pressure to #1 ADC
  • # 2/3 pitot tubes, supplies differential air pressure to #2 ADC/ADC3000
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6
Q

What records pitot heat position

A

The CVR/FDR

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7
Q

When does the windshield heat reach operating temperature

A

1 min

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8
Q

How long should you wait before turning generators off after stopping heater

A

2 min

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9
Q

What do the MAD vents operate with

A

The BLWR only

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10
Q

Explain the Heating control panel

A
  • Controls heater and vent system, as well as temp of heated air exiting heater
  • BLWR only - #2 AC BUS voltage is connected to the blower for vent operation only
  • OFF position - Power removed from heater system, allows blower to cool and remove fuel and vapor from heater to prevent post shutdown fire
  • HTR start button - immediately starts to purge the heater assembly of fuel or vapors to prevent hot start
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11
Q

Explain the heater fuel drain

A

Allow any excess fuel to be drained for heater unit

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12
Q

What’s the purpose of the heater cabin thermostat

A

Senses the cabin temp to maintain cabin temp

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13
Q

Explain the heater exhaust duct

A

Exhaust gases are discharged through exhaust port

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14
Q

Explain the heater ignition unit

A

Provides high voltage current for a continuous spark through a single spark plug mounted in the heater unit

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15
Q

Explain the heater fuel control unit

A

Supplies pressurized fuel to the heater unit through a fuel line to the heater unit

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16
Q

What does the heater unit provide

A

Provides heat for cold weather operation

17
Q

What does the air pressure switch do

A

Protects the heater by shutting down heater system if sufficient air flow is not available for proper heater operation

18
Q

Purpose of the Avionics cooling thermal switch

A

Activates the blower if temp in the heater compartment rises above 29°C

19
Q

Purpose of the heater electrical blower

A

Draws outside air and recirculates it for heating, ventilating and avionics cooling

20
Q

Explain the avionics inside air intake port

A

Cooler air is drawn in from the cabin area through the avionics air intake port for the purpose of avionics component cooling

21
Q

Explain the heater air intake ducting

A

Air for system is drawn in from inlet port through the intake ducting

22
Q

Purpose of the heater control relay box

A

Contains relays that control the function of the heater and heater HOT caution of the heater system

23
Q

Purpose of the intake port

A

Mounted on the airframe on R/H forward upper side of fuselage just aft of pilot’s jettisonable door

24
Q

Components of heating and ventilation system

A
  • Heater cabin thermostat
  • Heater fuel drain
  • Intake port
  • Heater control relay box
  • Heater air intake ducting
  • Avionics inside air intake port
  • Heater electrical blower
  • Avionics cooling thermal switch
  • Air pressure switch
  • Heater unit
  • Heater fuel control unit
  • Heater ignition unit
  • Heater exhaust duct
25
Q

Explain the pitot heat system

A

Heating elements prevent ice accumulation in pitot tubes and static ports

26
Q

Explain the Windshield anti-ice system

A

Anti-icing is provided for pilot/copilot windshields and defog is for center

27
Q

Explain the windshield wiper system

A

One electric motor operates both wipers through flexible shafts and two windshield wiper actuators

28
Q

Explain the heater and ventilation system

A
  • Ducting carries heated or ventilated air to the cockpit and cabin
  • Heater consumes approximately 15lbs of fuel/hr from the right main fuel tank
29
Q

What is the heater output capable of

A

200,000 BTU(British Thermal Units)/hr

CH47F (20 decks)

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