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T6-C Mechanical > Environmentals > Flashcards

Environmentals Flashcards

(75 cards)

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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
At what temp is the air entering the cockpit automatically controlled to
60 - 90 deg F
26
What switch allows you to control cockpit air temp and where is it located
Temp control switch on the environmental control panel in fwd cockpit right switch panel
27
Which portion of the temp control switch is used for auto temp control
Auto portion works on a potentiometer
28
Briefly describe the operation of the temp control switch in the manual position
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
29
What does the temp control switch recieve its inputs from
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.
30
What happens if the temp controller detects a temperature in excess of 165 deg F
It directs the the heat exchanger bypass valve to move to full closed forcing max bleed air through the heat exchanger.
31
Where is power for the temp controller provided from
CB placarded CKPT TEMP located on the generator bus circuit breaker panel in the front cockpit.
32
What four things does placing the defog switch to on do
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
If the defog switch is placed to off how long does the electrically controlled defog valve take to close
Up to 40 seconds
34
What effect does operation of the canopy defog have on the engine and why
Increases ITT for a given PCL setting because of higher bleed air load on engine
35
During a flaps up climb With defog on and PCL retarded to maintain ITT within limits, how is performance affected.
There is a reduction in performance of up to 47%
36
Name the 5 components of the pressurisation system
``` Control valve Safety valve Control valve regulator Differential pressure regulator (delta p regulator) Solenoid dump valve ```
37
What two valves combine to provide pressure control
Control valve | Control valve regulator
38
In what position is the dump solenoid de-energised
Open
39
What two valves operate together to give redundant control of max diff
Differential pressure reg (Delta p regulator) | Safety valve
40
Is the dump solenoid energised or de-energised with weight on wheels
De-energised open
41
What cockpit altitude is maintained until a cockpit diff pressure of 3.6+/- 0.2 psi
8000 ft
42
At what altitude is max diff reached
18069 ft
43
What is the cockpit pressure altitude at 31000ft
16600ft
44
At what cockpit pressure altitude does an amber CKPT ALT caution illuminate on EICAS
At or above 19000ft
45
At what cockpit press diff does a red CKPT PX EICAS message illuminate
3.9 - 4.0 psi
46
Where is the pressurisation control switch located
ECS panel
47
What are the three positions of the pressurisation control switch
Norm DUMP Ram/dump
48
In what position does the temp control switch control pressurisation automatically
NORM
49
What does selecting DUMP on the pressurisation control switch do
Removes power from the solenoid opening the control valve mechanically, however bleed air inflow continues
50
What does selecting the RAM/DUMP switch do
Opens the fresh air valve Closes the defog valve if open However bleed air inflow continues unless the bleed air inflow continues
51
How is cockpit and avionics cooling achieved
Vapour cycle system
52
How is the vapour cycle system controlled
By a toggle switch placarded AIR COND located on the ECS panel on RH fwd cockpit switch panel
53
In what two circumstances would the vapour cycle system be operating
With the AIR COND switch on | With the DEFOG switch to on
54
What four conditions must exist for AIR COND to operate
Engine running Generator is on line Gen bus is powered AIR COND or defog switch is on
55
When must the evap blowers be on
Whenever avionics master switch is on
56
What will interrupt electrical power to the compressor clutch should there be abnormally high or low system pressure
Bi level pressure switch located in the service panel just forward of the right wing.
57
What effect does air cond operation have on engine performance.
Negligible, air cond can be operated for all takeoffs landings and ground operations
58
What switch controls the fresh air valve during ground ops and unpressurised flight
RAM AIR FLOW on ECS panel in front cockpit
59
What bus supplies electrical power to the fresh air valve
Hot battery bus
60
What are the three positions of the Fresh air valve
Closed, mid open and full open which corresponds to the Off, Norm and Hi positions of the Ram Air Flow switch
61
At what altitude is the fresh air valve automatically closed
Approaching 8000 ft to allow the cockpit to pressurise
62
Where does air for OBOGS operation come from
Bleed air from LH P3 port
63
What obogs component provides a limited supply of oxygen in the event of obogs failure
Plenum
64
What factors is the obogs plenum supply based on
Cockpit pressurisation Aircraft pressure altitude Pilot regulator settings Pilot demand
65
Where is oxygen supplied from in the event of obogs failure
Ejection seat emergency oxygen supply
66
What component allows the pilot to breath cockp[it ambient air should obogs fail
Antisuffocation valve
67
What bus provides power for the obogs system
Hot battery bus
68
Will obogs operate in the event of engine failure
No
69
What are the indications of an obogs concentrator malfunction resulting in the production of zeolite dust
Respiratory irritation Coughing Presence of white dust in the oxygen mask
70
What 3 failures can a red OBOGS Fail EICAS message indicate
Low bleed air pressure upstream of the concentrator Low concentration of oxygen Internal OBOGS failure detected by BIT
71
An OBOGS FAIL EICAS message has displayed on start and then extinguished, what has occurred and can you continue the sortie
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
Will a failure be detected in the OBOGS system when first activated
Not for first 3 minutes as the OBOGS FAIL warning is inhibited during a 3 minute BIT
73
At what temperature does the OBOGS TEMP EICAS illuminate if an overheat is detected in the OBOGS ducting
200 deg F
74
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
Place the supply lever to on Concentration lever to MAX Pressure lever to emergency
75
What action is required to disable the OBOGS system
Oxygen supply lever in both cockpits must be off

T6-C Mechanical (1 decks)

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