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Ground School Systems 2 > PC-21 Flight Data Sensors and Miscellaneous Components > Flashcards

PC-21 Flight Data Sensors and Miscellaneous Components Flashcards

1
Q

How do flight sensors interact with the flight control computers?

A
  • Flight sensors measure the environmental conditions

- Flight control computers display the information on the PFD, HUD and SFD

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2
Q

What external flight data sensors is the A/C equipped with?

A

1) Angle of attack (AOA) transmitter
2) OAT sensor
3) Pitot tube
4) Static ports
5) Radar Altimeter

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3
Q

What flight control computers are there?

A
  • Air Data Computer (ADC)

- Air Data Unit (ADC)

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4
Q

Where is the AOA transmitter and what does it measure?

A
  • On the left wing
  • Measures the angle between the wing mean aerodynamic chord and the relative airflow
  • Provide pilot indications of AOA and stall alerts
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5
Q

What are the AOA transmitter components?

A

1) Vane - attached to the tube but rotates according to the airflow
2) Metal Tube

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6
Q

Where is the AOA indexer in the cockpit?

A

HUD in front cockpit

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7
Q

What information does RIOC 3 receive?

A
  • AOA information
  • Mach number
  • Landing gear and flap position
  • Computes a stall speed.
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8
Q

If Mach number is < 0.3, what is the stall speed based on? What about above?

A
  • For below M < 0.3, based on AOA, flaps position and landing gear position.
  • For above M > 0.3, only AoA and airspeed
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9
Q

What does an amber STALL mean?

A

Aircraft is approaching stall speed

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10
Q

What AOA indications are displayed on the HUD?

A
  • Stall AOA
  • Optimal Approach AOA
  • Current AOA
  • 0 deg AOA index
  • Only displayed when landing gear is selected down
  • Also displayed as a digital value in top left corner of the HUD
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11
Q

When do AOA indexers operate?

A
  • Landing gear is DN
  • Flaps position is valid
  • Aircraft is weight off wheel
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12
Q

What do red, green and amber mean on AOA indexer?

A 
Red = Too slow
Green = Correct landing AOA range
Amber = fast
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13
Q

How are AOA indexers powered?

A

By the BATT BUS

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14
Q

Where is AOA info displayed?

A
  • HUD
  • AOA indexer
  • PFD
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15
Q

When will aural tone sound for stall?

A

Within 10 kt or 0.5 g of the stall

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16
Q

What does the pitot-static system do?

A

Supplies air pressure data to determine airspeed and altitude of the aircraft.

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17
Q

Where is pitot tube located?

A

Leading edge of right wing

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18
Q

Where are the static ports?

A

One on each side of the fuselage

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19
Q

Which systems do static ports supply static pressure to?

A

Both No.1 and No.2 static pressure systems

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20
Q

What pressure inputs does the pitot-static system supply?

A
  • Pitot pressure
  • No.1 static pressure
  • No.2 static pressure
  • Supplies to ADC and ADU
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21
Q

What are some consequences of a pitot system blockage?

A
  • A/C not correctly trimmed in yaw by TAD
  • Incorrect attitude indication on the SFD
  • PMS not working correctly in auto mode
  • Unreliable AOA indication
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22
Q

What does the temp sensor do? How is it de-iced?

A
  • Lower surface of the left wing measures TOT of outside air.
  • Used in calculating TAS and Mach number
  • Aerodynamic shape helps to prevent ice buildup on its surface.
23
Q

Where is OAT displayed?

A
  • PFD

- MFD SYS and ECS

24
Q

What does the radar altimeter do?

A
  • Gives the aircrew reliable and accurate height for approaches and low flying.
  • Provides audio and visual alerts when descending through preset heights.
25
Q

What are components of radar altimeter?

A
  1. Transceiver - controls operation and interfaces with A/C systems
  2. Transmit antenna
  3. Receive antenna
26
Q

What is radar altimeter powered by?

A

GEN 1 BUS

27
Q

How is radar altimeter turned on?

A

Automatically when power is sent to A/C

28
Q

When is radar altimeter displayed on MFD and the HUD?

A

For heights up to 5500 ft

29
Q

How can a height threshold be set that will activate audio and visual alerts?

A
  • By pressing the HT function key on the PFD bezel and turning the multi function rotary switch.
  • Values from 0 to 5000 ft can be set
  • Can be used to provide min ground clearance for tactical low flight
30
Q

What are A/C axis limits for radar altimeter?

A
  • 30 deg in pitch

- 45 deg in roll

31
Q

What is the ADC?

A

Primary source of air data for the pilot and all aircraft systems.

32
Q

How is ADC powered?

A

BATT BUS

33
Q

What does the ADC continuously monitors?

A

1) Pitot pressure
2) No.1 static pressure
3) Total Air Temperature
4) Barometric pressure setting on the PFDs
5) Weight on Wheels (WOW) indication
6) Landing gear position indication
7) Flaps position indication
8) Airbrake position indication

34
Q

Where is data from ADC sent to?

A
  • Front and rear cockpit PFDs
  • ATC/ADS-B trnasponder
  • IRU
  • RIOC 3 + RIOC 4
  • FGC
  • FMS
  • GPS Landing System sensor unit
  • more
35
Q

What occurs with ADC once electrical power is supplied to the A/C? What occurs after this?

A
  • Power-up BIT (PBIT) test is carried out

- Continuous BIT (CBIT) test occurs after that

36
Q

What does the ADC compute?

A
  1. KIAS and KTAS
  2. Mach number
  3. Barometric correct and uncorrected altitude
  4. Altitude rate
  5. Correct static pressure
  6. OAT
37
Q

How does the ADC correct for static pressure position errors?

A

Static Source Error Correction (SSEC)

38
Q

What does an amber SFD caption mean?

A

SFD data is being used.

39
Q

How is ADU powered?

A

From Emergency BUS

40
Q

What occurs if the ADU fails?

A

SFD data is unavailable

41
Q

What is the function of the HUMS?

A
  • Recording system health status
  • Recording airframe fatigue data
  • Recording engine usage data
  • Notifying the ground crew when an event is detected
  • Installed for maintenance purposes.
  • Receives data from the ADC but doesn’t provide data to the ADC
42
Q

What is de-icing provided for?

A

1) Pitot tube - electrical heater
2) Static ports - Both static ports contains electrical heater
3) AOA transmitter - contains two heater elements
4) Prop
5) Engine air intake

43
Q

What de-icing systems are powered by BATT BUS?

A
  • Pitot tube inner heater element

- Right static port heater element

44
Q

What de-icing systems are powered by GEN 2 BUS?

A
  • Pitot tube outer heater element
  • Left static port heater element
  • Both AOA transmitter heater elements
45
Q

What does the PROBES switch do?

A

Control electrical supply to:

  • Pitot heater
  • Static port heaters
  • AOA transmitter heaters
46
Q

What is PROP switch do?

A

Controls Prop de-ice

47
Q

What does the INTAKE switch do?

A

Controls the inertial separation unit

48
Q

What occurs if there is a malfunction in a heater element?

A

DWP and MFD show associated alerts

49
Q

What does an amber ICE AOA caution on MFD and ICE caution on DWP mean?

A
  • Heating element has failed in the AOA sensor.
    OR
  • PROBES switch is not on and OAT is < 4 C
50
Q

When will amber ICE PITOT caution display on MFD and ICE caption on DWP?

A
  • Malfunction is detected in either of the pitot heater elements
  • A malfunction is detected in a heater element on either left or right static ports
  • The PROBES switch is selected to OFF when the OAT is < 4 C
51
Q

What does amber STEP advisory mean on MFD?

A

Step has not retracted

52
Q

What are the functions of the mirrors?

A

To monitor A/C flying in close formation

53
Q

What must be done to fly accurate headings using the standby compass?

A
  • PROBES switch must be in the PROBES position
54
Q

When is the ULB activated?

A

When it comes into contact with water, sends radio signal for 30 days.

Ground School Systems 2 (19 decks)

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