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T-6: Systems 2 > SYS 208 - ECS > Flashcards

SYS 208 - ECS Flashcards

1
Q

The engine provides bleed air for what?

A

Ckpt heating, canopy defog, anti-G, OBOGS, pressurization

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2
Q

What supplies air conditioning and avionics cooling?

A

Engine-driven vapor system that does not use bleed air but draws in ckpt air, cools it, and discharges it back into ckpt

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3
Q

The rear cockpit includes only which ECS switch?

A

Evaporator blower

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4
Q

What provides fresh air during ground ops?

A

Blower in a duct inside the cowling

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5
Q

What provides fresh air in flight?

A

Ram air inlet on top of the cowl

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6
Q

What activates the fresh air blower?

A

Weight-on-wheels switch

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7
Q

What controls the amount of fresh air ventilation for both ground ops and unpressurized flight?

A

RAM AIR FLOW switch
OFF fresh air valve closed
NORM fresh air valve mid open
HI fresh air valve full open

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8
Q

When does the pressurization override the RAM AIR FLOW switch & close the fresh air valve?

A

When the aircraft reaches a pressure altitude of 8,000ft

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9
Q

Which P3 port provides bleed air to the pressurization, heating, & anti-G?

A

Right port

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10
Q

Where does the temperature controller in the heat system receive inputs?

A

Ckpt temp sensor in duct between 2 ckpts, cabin temp sensor on rear pressure bulkhead, TEMP CONTROL switch

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11
Q

What does the heat exchanger bypass valve do?

A

Allows a portion of the warm bleed air to bypass the heat exchanger & mix with cooled air from heat exchanger

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12
Q

What happens if the ckpt temperature control sensor detects a temp in excess of 165°F?

A

Heat exchanger bypass valve forced closed all bleed air through heat exchanger

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13
Q

Which two temp sensing switches alert the pilot of overtemp in the ducting?

A

One in the duct near firewall shutoff valve, and other is located at the aft defog control valve

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14
Q

Amber DUCT TEMP annunciator comes on at what duct air temp?

A

300 F

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15
Q

What does setting the DEFOG switch to ON do?

A

Opens defog valve and sets the inflow valve to high (full open) higher volume of bleed air flow to heating system; turns on AC compressor to remove moisture from the air

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16
Q

How does the heating system ejector work?

A

High volume air creates venturi flow ejector draws in ambient ckpt air mixes w/ bleed air in main ckpt duct increase volume

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17
Q

How is defog air temp maintained?

A

TEMP CONTROL switch

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18
Q

What are the main components of the air conditioning system?

A

Belt-driven compressor at front of engine; condenser and blower in aft fuselage; front/rear ckpt evaporator/blower modules; service fittings

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19
Q

How is the refrigerant recharged?

A

By maintenance personnel through service fittings behind a panel on the right fuselage forward of the wing leading edge

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20
Q

How does the evaporator blower/AC work?

A

Engine-driven compressor sends liquid refrigerant to condenser evaporator coils blower draws ambient air over coil refrigerant absorbs heat & becomes vaport cooled air from evaporator/blower module discharges from ckpt outlet refrigerant moves back to compressor

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21
Q

What is the pressurization system’s pressure source?

A

Engine bleed air through heating & defogging systems & ckpt ducting

22
Q

How is the T-6A ckpt seal maintained?

A

Firewall, pressure flooring, aft pressure bulkhead, pressure seal around bottom of the canopy

23
Q

Where does the canopy pressure seal receive bleed air from?

A

Anti-G system

24
Q

What monitors ckpt pressure & automatically adjusts the position of the pressurization control valve?

A

Control valve regulator located in the aft pressure bulkhead

25
Q

Where is the ΔP regulator located, and what does it do?

A

Aft pressure bulkhead, monitors ckpt differential pressure

26
Q

When does the ΔP regulator signal the safety outflow valve to open & relieve overpressure in the ckpt?

A

If differential pressure exceeds 4.0 psi

27
Q

The evap blower can produce up to ____ cubic FPM of airflow in the HI setting

A

350

28
Q

What does the solenoid dump valve connected to the pressurization control valve do?

A

Aircraft is on the ground WOW power removed from solenoid pressurization valve open; After T/O WoffW power applied open & closes control valve as necessary to regulate ckpt pressure as aircraft approaches 8000ft pressure altitude

29
Q

What is the differential pressure at 18,069 ft?

A

3.6±0.2 ΔP

30
Q

8,000ft pressure altitude is maintained until 18,069ft, then constant ΔP. What is the pressure altitude at 31,000ft?

A

16,600ft

31
Q

When does amber CKPT ALT annunciator come on?

A

Ckpt pressure altitude exceeds 19,000ft

32
Q

When does red CKPT PX annunciator illuminate?

A

If ckpt differential pressure exceeds 3.9-4.0 psi

33
Q

What does the DUMP position on the PRESSURIZATION switch do?

A

Terminates electrical power to the solenoid dump valve, opening pressurization control valve to depressurize the ckpt; bleed air inflow continues, fresh air valve remains closed, ram air not provided to ckpt

34
Q

What does the RAM/DUMP position do on the PRESSURIZATION switch?

A

Depressurizes ckpt and opens fresh air valve, allowing ram air into the ckpt; automatically closes defog valve, eliminating that bleed air source

35
Q

T/F: The RAM/DUMP position has no effect on the bleed air inflow valve.

A

True: bleed air inflow continues if BLEED AIR INFLOW switch is in NORM or HI turn OFF to stop bleed air and allow more ram air flow

36
Q

When does the safety valve automatically relieve system pressure in the anti-G system?

A

Pressure exceeds 7 psi

37
Q

How does the anti-G valve work?

A

Weighted rod w/ opening for bleed air orifice is blocked @ 1G rod moves downward due to high +Gs more of orifice exposed pressure into suit

38
Q

Which P3 port supplies air for OBOGS?

A

Left P3 port

39
Q

Where is the OBOGS unit located, and what does it do?

A

Fuselage right side avionics bay concentrator in unit adjusts oxygen concentration for current altitude based on ckpt pressure

40
Q

How does oxygen flow in OBOGS?

A

Bleed air through oxygen shutoff valve OBOGS heat exchanger high temp/low pressure switches OBOGS unit

41
Q

What is the plenum part of the OBOGS?

A

Small holding tank located below the concentrator in line between the OBOGS unit & the regulators

42
Q

What does the plenum do in the event of OBOGS system failure?

A

Provides a limited supply of oxygen until the emergency oxygen system activates duration of supply depends on ckpt pressurization, aircraft pressure altitude, pilot regulator settings, pilot demand

43
Q

The OBOGS is operative when?

A

When either ckpt regulator supply lever is ON set both supply levers to OFF to disable OBOGS

44
Q

What does the anti-suffocation valve do?

A

Part of oxygen hose which allows you to continue breathing ambient ckpt air if the OBOGS fails

45
Q

What causes the red OBOGS FAIL annunciator to illuminate?

A

Low bleed air pressure before the concentrator closes the low pressure switch

46
Q

What causes the amber OBOGS TEMP annunciator to illuminate?

A

Bleed air temperature in excess of 200°F in the OBOGS ducting

47
Q

When does the OBOGS initially enter a BIT, for how long, and when has it failed?

A

Initial power-up; ~4min; OBOGS FAIL = failed BIT

48
Q

When changing the position of the TEMP CONTROL switch, what valve does this re-position?

A

The Heat Exchanger Bypass Valve

49
Q

When the TEMP control switch is in the AUTO position, how is heating/cooling determined?

A

The TEMP CONTROL switch determines the position of the the heat exchanger bypass valve based on inputs from the temp sensor in the inflow duct and the cabin temp sensor located behind the rear seat.

50
Q

Opening and closing the heat exchanger bypass valve allows for what to happen?

A

It allows for the warm bleed air to bypass the heat exchanger and mix with the cooled air discharged from the heat exchanger

51
Q

How is fresh air distributed in the cockpits?

A

Via the footwarmers and defog vents (separate from AC system)

T-6: Systems 2 (7 decks)

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