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T6-C Mechanical > Environmentals > Flashcards

Environmentals Flashcards

1
Q

How is cockpit air heated and cooled

A

Heated by condition bleed air

Cooled by vapour cycle system using an engine driven compressor

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2
Q

Where are the environmental controls located

A

Front cockpit right side console

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3
Q

Power is provided through which circuit breaker located where

A

CKPT TEMP

FWD Cockpit Generator panel

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4
Q

The heat exchanger is divided into two sections what goes through each section

A

Anti-G, OBOGS and canopy seal

All other Enviros functions

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5
Q

Where is bleed air tapped from for ECS and what’s is it used for

A

P3 left - OBOGS

P3 Right - canopy seal, anti-g, heating/defogging and pressurisation.

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6
Q

What two sources of cooling air is supplied to the heat exchanger.

A

Blower on the ground thru weight on wheels

Ram in flight

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7
Q

Which two switches control the position of the bi-level flow control shutoff valve (inflow valve)

A

Bleed air inflow switch on ECS panel

Defog switch on centre console

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8
Q

What two switches must be off to prevent P3 bleed air from entering the cockpit

A

Bleed air inflow switch

Defog switch

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9
Q

What CB is power provided through for the bi level flow control and shut off valve (inflow valve), and Bi level flow control bypass valve (defog valve).

A

INFLOW SYS CB on fwd cockpit batt bus panel.

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10
Q

What position is the inflow valve in if air con compressor is operating and the aircraft is below 7500 flat MSL and why

A

Automatically closed. It improves cooling performance by eliminating warm bleed air into the cockpit.

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11
Q

When the defog switch is set to on what is the position of the Bi-level flow control shutoff valve and why

A

Fully open

To maximise the volume of bleed air entering the cockpit

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12
Q

Where are the two overtemp sensing sources downstream of the heat exchanger located and what are the temperatures and indication

A

Rear distribution valve aft of the front ejection seat
Duct just aft of the firewall
300*F
Amber DUCT TEMP eicas message

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13
Q

What is shut down when the firewall shut off handle is pulled

A

Hydraulic system
Fuel system
Environmental system

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14
Q

Briefly describe the operation of the anti-G system

A

A weighted rod covers an orifice at nil g conditions but as G is encountered the rod moves down opening an orifice to allow engine bleed air to inflate the g-suit. The more gs encountered the more of the orifice is exposed allowing more bleed air in and proportionally inflating the g-suit

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15
Q

What switch controls the canopy seal/anti-g shutoff valve

A

Bleed air inflow valve

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16
Q

Where is power for the canopy seal/anti-g shutoff valve provided from

A

CB placarded INFLOW SYS on batt bus CB panel in fwd cockpit.

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17
Q

Canopy seal/anti-g shutoff valve is de-energised_________

A

Closed

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18
Q

What component in the canopy seal/anti-g system protects the anti-g valves from contamination

A

Water seperator

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19
Q

Explain how the anti-g test button tests the system.

A

When the button is pressed the weighted rod is depressed to allow bleed air to flow into the suit

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20
Q

Where is bleed air for heating and defogging tapped off from?

A

RH p3 port

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21
Q

What valves are used to route bleed air for heating and defogging

A

Bleed air inflow valve (bi level flow control and shutoff valve)and defog valve (bi level flow control bypass valve).

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22
Q

How is air for heating and defogging routed in the cockpit

A

Via the Vent control lever placarded Air located on the centre console in fwd cockpit only

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23
Q

How is air for heating and defogging distributed in they cockpit

A

Via the defog outlets and foot warmers

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24
Q

The vent control lever mechanically controls what valves in the air ducts

A

The butterfly valves

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25
Q

At what temp is the air entering the cockpit automatically controlled to

A

60 - 90 deg F

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26
Q

What switch allows you to control cockpit air temp and where is it located

A

Temp control switch on the environmental control panel in fwd cockpit right switch panel

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27
Q

Which portion of the temp control switch is used for auto temp control

A

Auto portion works on a potentiometer

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28
Q

Briefly describe the operation of the temp control switch in the manual position

A

Moving the temp control switch to the 6 o’clock position where it is spring loaded toward null position. Moving the switch left or right towards hot or cold manually changes the position of the heat exchanger bypass valve

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29
Q

What does the temp control switch recieve its inputs from

A

Temp control sensor located in the duct between the two cockpits, the temp control rheostat position and the cabin temperature sensor located on the rear pressure bulkhead.

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30
Q

What happens if the temp controller detects a temperature in excess of 165 deg F

A

It directs the the heat exchanger bypass valve to move to full closed forcing max bleed air through the heat exchanger.

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31
Q

Where is power for the temp controller provided from

A

CB placarded CKPT TEMP located on the generator bus circuit breaker panel in the front cockpit.

32
Q

What four things does placing the defog switch to on do

A

Defog valve is opened increasing the bleed air supply
The inflow valve is set to high further increasing the the amount of bleed air entering the cockpit
The aircon compressor is automatically turned on to dry the air
An ejector downstream of the heat exchanger takes the bleed air and passes it through a venturi (jet pump) drawing ambient air into the ecs ductingfurther increasing the volume of air available for defogging.

33
Q

If the defog switch is placed to off how long does the electrically controlled defog valve take to close

A

Up to 40 seconds

34
Q

What effect does operation of the canopy defog have on the engine and why

A

Increases ITT for a given PCL setting because of higher bleed air load on engine

35
Q

During a flaps up climb With defog on and PCL retarded to maintain ITT within limits, how is performance affected.

A

There is a reduction in performance of up to 47%

36
Q

Name the 5 components of the pressurisation system

A 
Control valve
Safety valve
Control valve regulator
Differential pressure regulator (delta p regulator)
Solenoid dump valve
37
Q

What two valves combine to provide pressure control

A

Control valve

Control valve regulator

38
Q

In what position is the dump solenoid de-energised

A

Open

39
Q

What two valves operate together to give redundant control of max diff

A

Differential pressure reg (Delta p regulator)

Safety valve

40
Q

Is the dump solenoid energised or de-energised with weight on wheels

A

De-energised open

41
Q

What cockpit altitude is maintained until a cockpit diff pressure of 3.6+/- 0.2 psi

A

8000 ft

42
Q

At what altitude is max diff reached

A

18069 ft

43
Q

What is the cockpit pressure altitude at 31000ft

A

16600ft

44
Q

At what cockpit pressure altitude does an amber CKPT ALT caution illuminate on EICAS

A

At or above 19000ft

45
Q

At what cockpit press diff does a red CKPT PX EICAS message illuminate

A

3.9 - 4.0 psi

46
Q

Where is the pressurisation control switch located

A

ECS panel

47
Q

What are the three positions of the pressurisation control switch

A

Norm
DUMP
Ram/dump

48
Q

In what position does the temp control switch control pressurisation automatically

A

NORM

49
Q

What does selecting DUMP on the pressurisation control switch do

A

Removes power from the solenoid opening the control valve mechanically, however bleed air inflow continues

50
Q

What does selecting the RAM/DUMP switch do

A

Opens the fresh air valve
Closes the defog valve if open
However bleed air inflow continues unless the bleed air inflow continues

51
Q

How is cockpit and avionics cooling achieved

A

Vapour cycle system

52
Q

How is the vapour cycle system controlled

A

By a toggle switch placarded AIR COND located on the ECS panel on RH fwd cockpit switch panel

53
Q

In what two circumstances would the vapour cycle system be operating

A

With the AIR COND switch on

With the DEFOG switch to on

54
Q

What four conditions must exist for AIR COND to operate

A

Engine running
Generator is on line
Gen bus is powered
AIR COND or defog switch is on

55
Q

When must the evap blowers be on

A

Whenever avionics master switch is on

56
Q

What will interrupt electrical power to the compressor clutch should there be abnormally high or low system pressure

A

Bi level pressure switch located in the service panel just forward of the right wing.

57
Q

What effect does air cond operation have on engine performance.

A

Negligible, air cond can be operated for all takeoffs landings and ground operations

58
Q

What switch controls the fresh air valve during ground ops and unpressurised flight

A

RAM AIR FLOW on ECS panel in front cockpit

59
Q

What bus supplies electrical power to the fresh air valve

A

Hot battery bus

60
Q

What are the three positions of the Fresh air valve

A

Closed, mid open and full open which corresponds to the Off, Norm and Hi positions of the Ram Air Flow switch

61
Q

At what altitude is the fresh air valve automatically closed

A

Approaching 8000 ft to allow the cockpit to pressurise

62
Q

Where does air for OBOGS operation come from

A

Bleed air from LH P3 port

63
Q

What obogs component provides a limited supply of oxygen in the event of obogs failure

A

Plenum

64
Q

What factors is the obogs plenum supply based on

A

Cockpit pressurisation
Aircraft pressure altitude
Pilot regulator settings
Pilot demand

65
Q

Where is oxygen supplied from in the event of obogs failure

A

Ejection seat emergency oxygen supply

66
Q

What component allows the pilot to breath cockp[it ambient air should obogs fail

A

Antisuffocation valve

67
Q

What bus provides power for the obogs system

A

Hot battery bus

68
Q

Will obogs operate in the event of engine failure

A

No

69
Q

What are the indications of an obogs concentrator malfunction resulting in the production of zeolite dust

A

Respiratory irritation
Coughing
Presence of white dust in the oxygen mask

70
Q

What 3 failures can a red OBOGS Fail EICAS message indicate

A

Low bleed air pressure upstream of the concentrator
Low concentration of oxygen
Internal OBOGS failure detected by BIT

71
Q

An OBOGS FAIL EICAS message has displayed on start and then extinguished, what has occurred and can you continue the sortie

A

The upstream low pressure switch has detected no pressure and extinguished as the line pressurised on start. This is normal and sortie can be continued.

72
Q

Will a failure be detected in the OBOGS system when first activated

A

Not for first 3 minutes as the OBOGS FAIL warning is inhibited during a 3 minute BIT

73
Q

At what temperature does the OBOGS TEMP EICAS illuminate if an overheat is detected in the OBOGS ducting

A

200 deg F

74
Q

How can the oxygen pressure regulator be gang loaded to provide high oxygen content pressurised breathing in the event of hypoxia symptoms or loss of cabin pressure

A

Place the supply lever to on
Concentration lever to MAX
Pressure lever to emergency

75
Q

What action is required to disable the OBOGS system

A

Oxygen supply lever in both cockpits must be off

T6-C Mechanical (1 decks)

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