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ATR > Flight Instruments > Flashcards

Flight Instruments Flashcards

1
Q

How many Air Data Systems?

A

Three - two main and one standby

Powered by DC emer bus and backed up by hot emer batt bus

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2
Q

What inputs do the ADVs receive?

A
  • Static air pressure
  • Total air pressure
  • Total air temperature
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3
Q

What does ADC 1 supply?

A
  • captains instruments
  • AHRS 1
  • Flight Data Acquisition Unit
  • GPWS system
  • Pressurisation system
  • Automatic flight control system
  • MFCs
  • Transponder
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4
Q

What does ADC 2 feed?

A
  • FO’s instruments
  • AHRS 2
  • Flight Data Acquisition Unit
  • MFCs
  • Pressurisation System
  • Automatic Flight Control System
  • Transponder System
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5
Q

What powers the captains airspeed indicator?

A

26 V AC standby bus

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6
Q

What powers the FO’s ASI?

A

26 V AC Bus 2

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7
Q

What does the barber pole on the ASI indicate?

A

The max airspeed computed by the associated ADC

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8
Q

What does the fast/slow indicator on the EADI refer to ?

A

The airspeed but set in the airspeed indicator

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9
Q

What failure flags show on the ASI?

A

Red VMO flag - failure in VMO channel

Red OFF flag - failure on the IAS indicator and VMO channel or loss of AC power

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10
Q

What powers the captains altimeter?

A

26 VAC stby bus

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11
Q

What powers the FO’s altimeter

A

26 VAC Bus 2

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12
Q

What powers the FO’s altimeter

A

26 VAC Bus 2

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13
Q

When does the altitude alert light illuminate?

A

When the aircraft altitude is within 1000ft of selected altitude

Extinguishes when aircraft is within 250 ft of selected altitude

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14
Q

When will an OFF flag show on the altitude counter?

A
  • power failure
  • associated ADC failure
  • erroneous info displayed
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15
Q

When will an OFF flag show on the altitude counter?

A
  • power failure
  • associated ADC failure
  • erroneous info displayed
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16
Q

What powers the electrical vibrator in the standby altimeter?

A

DC Bus 1

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17
Q

What powers the VSIs?

A

Captain - 26VAS Stby Bus

FO - 26 VAC Bus 2

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18
Q

What is the VSI range?

A

0 - 6000 fpm

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19
Q

When will a VS flag be displayed on the VSI?

A

When there is a failure of the vertical speed indicator - the pointer will also be removed from view

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20
Q

Where is the TAS displayed?

A

On the TAS indicator located on Captain’s side

ADC selected by the ADC switch is used to calculate the TAS

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21
Q

What does it mean if the TAS display shows amber dashes?

A

The ADC is producing an invalid signal

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22
Q

What is the TAS display range?

A

68 - 600 kt

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23
Q

What do three amber dashes mean on the TAT indicator?

A

The selected ADC is calculating an invalid TAT value

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24
Q

What does the amber FAULT light mean above the ADC switch?

A

The selected ADC disagrees with the ADC selector switch position

25
Q

How many AHRS systems?

A

Three - AHRS 1 + 2 plus a standby system

26
Q

Where are the AHRUs?

(Attitude heading reference units)

A

The floor of the forward cargo compartment

Operational through 360 degrees of bank and 90 degrees of pitch

27
Q

What powers the AHRSs?

A

AHRS 1 - primary is the DC emer bus, back up is DC bus 2

AHRS 2 - primary is DC bus 2, back up is DC emer bus (ground) and DC Bus 1 (flight)

28
Q

Where are the flux valves located?

A

In each wing tip

Provide info to the associated AHRU

29
Q

What does AHRS 1 supply?

A
  • number 1 symbol generator unit
  • FOs RMI
  • Flight data acquisition unit
  • Weather radar (only supplied with attitude info to stabilise the antenna)
30
Q

What does AHRS 2 supply?

A
  • number 2 symbol generator
  • Captain’s RMI
31
Q

How are the RMIs and AHRSs coupled?

A

Each AHRS is coupled to the opposite RMI

32
Q

When will a red OFF flag show on an RMI?

A

In the event of a loss of the associated AHRS data or if there is an internal failure of the RMI

33
Q

What does the A/ERECT fail light indicate?

A

Loss of TAS info

34
Q

What is AHRS basic mode?

A

When TAS info is lost

Affected AHRS can still be erected in flight however aircraft must be in unaccelerated level flight

;Push and hold AHRS pb for 15 secs

35
Q

How long does it take for the AHRS system to initialise?

A

3 minutes

ATT and FAIL flags will appear whilst initialising

Time remaining can be determined by pressing the respective AHRS button

Compass will decrease 1 degree per second until it shows zero

36
Q

What powers the standby attitude indicator?

A

Primary - DC ess bus

Back up - Hot emer bat bus

37
Q

What does the red and white flag mean on the standby AI?

A
  • loss of power
  • insufficient gyro speed to provide a reliable attitude indication
38
Q

What happens if an SGU fails?

A

Either SGU can supply four CRTs if necessary

39
Q

What mode are weather returns displayed?

A

Arc mode

40
Q

What is the range of DH that can be selected?

A

-10 ft to 990 ft

41
Q

What will the EFIS test show?

A

Display of all failure messages on the EFIS displays

41
Q

How is the DH cleared from the EADI?

A

By selecting a value of zero which will remove DH and white letters

42
Q

What will the radio altimeter test show?

A

A radio altitude of 100ft will be displayed on the EADI

43
Q

What is composite mode?

A

EHSI is turned off and all screen information is portrayed on the EADI

44
Q

What is map mode?

A

Waypoints are displayed on the associated EHSI

Active waypoint displayed in magenta and other waypoints in white

45
Q

What can be switched on the switching panel?

A
  • ATT/HDG
  • VOR/ILS
  • EFIS symbol generator
46
Q

How is a failure of AHRS 1 shown?

A
  • Removal of attitude and heading info from the EADI and EHSI
  • EADI will show a red ATT FAIL message
  • EHSI will display a red HDG FAIL message at the top of the EHSI
47
Q

How will a VOR or ILS fail be indicated?

A
  • EADI will display a red cross over the glideslope deviation indicator and the lateral deviation indicator
  • EHSI will display red cross over the vertical deviation indicator and lateral deviation indicator and amber dashes for the course and distance indications
48
Q

How is an SGU failure indicated?

A
  • Removal of all info from the affected sides EHSI and EADI
  • red cross with a red SG FAIL message
49
Q

What is the EFIS COMP alert?

A

if an SGU detects a significant difference between the two inputs

50
Q

What heading difference will trigger an alert?

A

More than 6 degrees angle of bank at bank angles below 6 degrees
12 degrees difference if bank angle more than 6 degrees
Amber HDG message

51
Q

What pitch and roll difference will trigger an alert?

A

If pitch or roll differs by more thann 6 degrees, amber PIT or ROL message

If both differ by more than 6 degrees, amber ATT message

52
Q

What ILS difference will trigger a warning?

A

Localizer - difference of more than 0.6 degrees, amber LOC message

Glideslope - difference of more than 0.2 degrees, amber GS message

If both loc and gs differ by more than 0.6 and 0.2 respectively, amber ILS message

53
Q

When does the CVR and DFDR start and stop recording?

A

Start - when aircraft is operating under its own electrical power

(if powered by a GPU recorders are off until one engine operating)

Stop - ten minutes after the engines have been shut down

54
Q

What does the CVR record?

A

Retains the last 30 minutes of recordings

55
Q

What does the DFDR retain?

A

Retains the last 25 hours of recordings

56
Q

When will the CVR erase button work?

A
  • landing gear shock absorbers compressed
  • parking brake set

tape completely erased by pressing and holding erase pb

57
Q

What indicates a successful CVR test?

A

Movement of the pointer into the white band area

58
Q
A

ATR (25 decks)

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