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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
How many AHRS systems?
Three - AHRS 1 + 2 plus a standby system
26
Where are the AHRUs? (Attitude heading reference units)
The floor of the forward cargo compartment Operational through 360 degrees of bank and 90 degrees of pitch
27
What powers the AHRSs?
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
Where are the flux valves located?
In each wing tip Provide info to the associated AHRU
29
What does AHRS 1 supply?
- number 1 symbol generator unit - FOs RMI - Flight data acquisition unit - Weather radar (only supplied with attitude info to stabilise the antenna)
30
What does AHRS 2 supply?
- number 2 symbol generator - Captain's RMI
31
How are the RMIs and AHRSs coupled?
Each AHRS is coupled to the opposite RMI
32
When will a red OFF flag show on an RMI?
In the event of a loss of the associated AHRS data or if there is an internal failure of the RMI
33
What does the A/ERECT fail light indicate?
Loss of TAS info
34
What is AHRS basic mode?
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
How long does it take for the AHRS system to initialise?
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
What powers the standby attitude indicator?
Primary - DC ess bus Back up - Hot emer bat bus
37
What does the red and white flag mean on the standby AI?
- loss of power - insufficient gyro speed to provide a reliable attitude indication
38
What happens if an SGU fails?
Either SGU can supply four CRTs if necessary
39
What mode are weather returns displayed?
Arc mode
40
What is the range of DH that can be selected?
-10 ft to 990 ft
41
What will the EFIS test show?
Display of all failure messages on the EFIS displays
41
How is the DH cleared from the EADI?
By selecting a value of zero which will remove DH and white letters
42
What will the radio altimeter test show?
A radio altitude of 100ft will be displayed on the EADI
43
What is composite mode?
EHSI is turned off and all screen information is portrayed on the EADI
44
What is map mode?
Waypoints are displayed on the associated EHSI Active waypoint displayed in magenta and other waypoints in white
45
What can be switched on the switching panel?
- ATT/HDG - VOR/ILS - EFIS symbol generator
46
How is a failure of AHRS 1 shown?
- 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
How will a VOR or ILS fail be indicated?
- 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
How is an SGU failure indicated?
- Removal of all info from the affected sides EHSI and EADI - red cross with a red SG FAIL message
49
What is the EFIS COMP alert?
if an SGU detects a significant difference between the two inputs
50
What heading difference will trigger an alert?
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
What pitch and roll difference will trigger an alert?
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
What ILS difference will trigger a warning?
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
When does the CVR and DFDR start and stop recording?
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
What does the CVR record?
Retains the last 30 minutes of recordings
55
What does the DFDR retain?
Retains the last 25 hours of recordings
56
When will the CVR erase button work?
- landing gear shock absorbers compressed - parking brake set tape completely erased by pressing and holding erase pb
57
What indicates a successful CVR test?
Movement of the pointer into the white band area
58

ATR (25 decks)

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