Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

DO228 type rating > Section 7- environmental control > Flashcards

Section 7- environmental control Flashcards

1
Q

what is used to supply the cabin and cockpit with heated conditioned, or ambient air?

A

bleed air from both engines or ram air

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

where are the air outlets for environmental control?

A
  • cabin floor
  • cabin adjustable overhead
  • cabin overhead trickle
  • cockpit floor
  • cockpit overhead
  • demisting
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

what supplies the control functions of the heating/aircon system?

A

28v DC and 115v (400hz) AC

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what protects the heating/aircon system?

A
  • CABIN AIR/NON ESS BUS on AC/DC breaker panel

- CABIN AIR /115 AC BUS on the AC/DC breaker panel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

what protects the bleed air valve of the LH engine?

A
  • CABIN AIR/NON ESS BUS on AC/DC breaker panel
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what protects the bleed air valve of the RH engine?

A
  • RAM AIR/BLEED RH/ BUS 1 on the AC/DC breaker panel
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

where is bleed air tapped from?

A

the 2 engines

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

what does each bleed air line include?

A
  • flow limiter
  • shutoff valve which is solenoid controlled to provide an air on/off function
  • a thermal duct to cool the bleed air
  • a check valve designed to prevent cross feeding from one engine to the other
  • downstream of the check valve the 2 bleed air ducts are united to a single line colocated with the tapping point of the optionally installed surface de-icing system
  • the air is then fed through a combined pressure regulating and shutoff valve designed to regulate the pressure to the nominal value for supply to heating or air con
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

how does the heating and ventilation system work?

A

ambient air is drawn in by a fan and then distributed via ducting to the cabin and crew stations and the demisting system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

how is heating provided?

A

hot air downstream of the bleed air pressure regulating and shutoff valve is added to the drawn in ambient air in a mixing chamber prior to its distribution to the compartments

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

what determines the amount of hot air added to the heating system?

A

the temperature regualtion system via the temperature control valve which is normally operated by the heat rheostat on the pneumatic control panel in the cockpit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

what will a temperature rise above the preset temperature on the heating system trigger?

A

CABIN TEMP caution light

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

what must be selected to ensure correct cockpit and cabin ventilation if the heating system fails?

A

the ram air system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

what occurs downstream of the pressure regulating and shutoff valve?

A

the precooked bleed air is divided into 2 routes which meet again at the mixing chamber

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

what will be displayed if the air pressure prior to entering the air conditioner is too high?

A

BLEED PRESS caution light

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

which 2 routes does the air take before meeting again at the mixing chamber?

A
  • part of the air goes directly to the mixing chamber

- the other part of the air is routed to the mixing chamber via a heat exchanger and a cooling turbine

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

what regulates and shuts the mixing chamber?

A

temperature control valve controlled by the temperature controller

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

what are the 2 airflows mixed to establish in the mixing chamber?

A

cabin outlet temperatures between 18C and 28C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

where does the air go from the mixing chamber?

A

routed through a water separator and 2 distribution lines to the air outlets in the cockpit and cabin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

how is ambient air drawn in?

A

over the air-conditioning installation bay through the heat exchanger by a cold air unit fan

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

what is water from the water separator used for?

A

for better efficiency through extra cooling

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

what should be selected to ensure correct ventilation if the air con system fails?

A

ram air system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

what operates the environmental control?

A

a pneumatic control panel on the co-pilots side

24
Q

what positions can the 3 position AIRCOND selector switch be in for normal operation?

A

HIGH or NORM

25
Q

what happens if the 3 position AIRCOND selector switch is put to the RAM AIR position?

A

electrical power to the AIRCOND switch relay will be interrupted and the ram air shutoff valve will open

with airconditioing system installed the AC master switch will automatically return to the OFF position

26
Q

where is the 2 position AIRCOND master switch usually held?

A

electromagnetically held in the ON position

27
Q

when is the use of heating or airconditioing possible?

A

when BLEEDAIR is switched ON

28
Q

when should both bleed switches be on?

A

in flight

29
Q

when will the pressure regulating and shutoff valve be open?

A

when the AIRCOND master switch is ON electrical power will open it if one or both of the BLEEDAIR switches are in the ON position with the engines runnign

30
Q

with the air-conditioning system installed when will the switch return to the OFF position?

A

whenever one or both of the ENGINE SPEED levers is above 85% and the gear is down and locked

31
Q

what does the TEMP MODE switch allow?

A

selection of the automatic or manual cabin temperature control

32
Q

what does the AUTO POSITION switch position do on TEMP MODE?

A

Temperature will be maintained automatically as selected by the heat control rheostat

33
Q

what does the MAN switch position do on TEMP MODE?

A

temperature can be controlled via a 3 position MAN CONTR switch

34
Q

when do we use MAN on TEMP MODE?

A

failed AUTO mode

35
Q

what may happen with the airconditioing system if COLD has been selected with MAN CONTR or the temperature regulating system has failed in AUTO?

A

ice or snow may be created within the air ducts

36
Q

what should we do if heating or cooling is required in MAN MODE?

A

MAN CONTR switch should be used in short bursts to either HOT or COLD until the desired temperature is reached to prevent an overheat condition or formation of ice

37
Q

what will a continuous activation of the MAN CONTR switch for 10 seconds do?

A

fully open/close the temperature control valve

38
Q

what does the temperature switch do?

A

monitors the temperature in the supply duct to the compartments

39
Q

what if duct temperature exceeds 65C?

A

amber CABIN TEMP light will illuminate

40
Q

how is distribution of air in the cockpit controlled?

A

CKP AIR slider

41
Q

how is demisting controlled?

A

DEMISTING SLIDER

42
Q

what is the RAM AIR system provided for?

A

to ventilate the cabin and cockpit if the heating or air con systems have been switched off

43
Q

what does the ram air system use?

A

ram air normally shutoff by a shutoff valve, which is distributed to the cockpit and cabin through the heating/air con system distribution lines and outlets

44
Q

what does the demisting system use?

A

air from the heating/airconditioing system or ram air depending on the pilots selection via the DEMISTING slider

45
Q

is there a guaranteed minimum airflow to the windshield demister?

A

yes

46
Q

where is the operating hours counter found if installed?

A

RH avionics rack

47
Q

what does the operating hours counter record when aircon is switched on?

A

total air conditioning operating hours

48
Q

what protects the cabin air system?

A

CAVBIN AIR/NON ESS BUS on the overhead breaker panel

49
Q

where are the electrical cockpit heaters found if installed?

A

rear wall of the forward baggage compartment

50
Q

where are the warm air outlets in the cockpit for the optional electrical heater?

A

in front of the rudder pedals

51
Q

what are the optional cockpit heaters powered by?

A

2 position toggle switch labeled CKP HEAT

52
Q

what are the optional cabin heaters powered by if installed?

A

2 position toggle switch labeled CABIN HEAT

53
Q

what powers the optional cabin/cockpit heater?

A

28V DC

54
Q

what protects the optional cockpit heaters?

A

CKP-HEAT LH
CKP-HEAT CONTR
CKP HEAT RH

all on NON ESS BUS on the AC/DC breaker panel

55
Q

where are the optional electrical cabin heaters installed?

A

on the cabin floor in the rear cabin area near the side walls

56
Q

what protects the optional cabin heaters?

A

CABIN-HEAT LH

CABIN-HEAT CONTROL

CABIN-HEAT RH

allow the NON ESS BUS on the LH avionics rack

57
Q

when will the optional electric cabin/cockpit heaters switch off to protect from overheating?

A

when temperature in the duct exceeds 70C

DO228 type rating (22 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions