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Module 13 EASA Part 7 Book 3 > Chapter 4 - Ground Proximity Warning > Flashcards

Chapter 4 - Ground Proximity Warning Flashcards

1
Q

What are the inputs to GPWS?

A
  • Computer airspeed
  • Barometric altitude
  • Barometric altitude rate
  • Radio altitude
  • Glide slope deviation
  • Magnetic heading
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2
Q

What would inhibit certain modes of the GPWS?

A

Flap or landing gear position

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3
Q

What happens when the GND PROX FLAP OVRD and GND PROX CONFIG GEAR OVRD switches are activated?

A

Override the flaps up and gear up position information

Simulate a flaps down 25° or gear down condition

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4
Q

What does the GND PROX G/S INHB switch do?

A
  • Inhibits the aural and visual mode 5 (below G/S) indications
  • Mode 5 also inhibited during a backcourse landing approach
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5
Q

Describe the PULL UP light?

A
  • Red
  • Indicates a mode 1 or mode 2A PULL UP warning condition
  • Level A warning
  • Located on the Captain’s Instrument Panel
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6
Q

Describe the GND PROX G/S INHB switch?

A
  • Indicate advisory modes 1 through 5
  • Level C advisory message
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7
Q

What are the seven modes of GPWS?

A
  1. Excessive descent rate
  2. Excessive closure rate with respect to rising terrain
  3. Loss of altitude after take-off or during go around
  4. Too close to terrain when not in landing configuration
  5. Excessive deviation below glide slope
  6. Radio altitude callouts
  7. Windshear
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8
Q

What is the alerting sequence for Modes 1 and 2?

A

Initial annunciation is an alert but if the condition persists, the respective warning replaces the alerts

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9
Q

What is the alerting sequence for Modes 3, 4, 5 and 6?

A

Alert only

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10
Q

What is the alerting sequence for Mode 7?

A

Warning only mode

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11
Q

What does a GPWS warning consist of?

A
  • A red indication of the PFC
  • An aural annunciation
  • Illumination of the master warning lights
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12
Q

What does a GPWS alert consist of?

A
  • Aural annunciation
  • Illumination of the amber GND PROX G/S INHB light/switch in all cases except Mode 6 (Radio altitude callouts)
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13
Q

What is Mode 1 independent of?

A

Landing gear and flap positions

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14
Q

When will Mode 1 indications occur?

A

Below 2,450 ft radio altitude down to 50 ft when the barometric altitude rate exceeds a threshold value

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15
Q

How is the Mode 1 divided?

A
  • Initial penetration (SINK RATE)
  • Inner warning (PULL UP)
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16
Q

What are the aural messages during Mode 1?

A

Alert - SINK RATE
Warning - WHOOP! WHOOP! PULL UP

17
Q

When is Mode 2A active?

A

When the flaps are at 20 units or less

18
Q

When is Mode 2B active?

A
  • Flaps are down 25-30 units
  • If the aircraft is making an ILS approach within 2 dots deviation
19
Q

When will Mode 3 be active?

A

After take-off or during a missed approach, with the landing gear up and/or the flaps less than 25 units

20
Q

What aural alert will the pilot get in Mode 3?

A

DON’T SINK

21
Q

When are the various parts of Mode 4 active?

A

Mode 4A - During cruise and approach with the landing gear up
Mode 4B - In cruise and approach, but with the landing gear down
Mode 4C - During take-off with the landing gear up and/or flaps less than 25 units

22
Q

When will Mode 6 alert/call outs be repeated again?

A
  • Aircraft ascends above 1,000 feet radio altitude
  • Aircraft makes a transition from approach to take-off
23
Q

What is the most dangerous type of windshear?

A

Microburst

24
Q

Describe microburst and its dangers to aircraft?

A

Column of downward moving air

Most dangerous below 500 feet, where pilots have little time and airspace to recover

25
Q

When is Mode 7 active?

A

Within 1500 feet radio altitude

26
Q

What annunciations are given at windshear?

A
  • Siren sounds and then there is an aural message ‘WINDSHEAR WINDSHEAR WINDSHEAR’
  • Red WINDSHEAR warning message shows on the EICAS display
  • Red WINDSHEAR warning message shows on the PFD
  • Master warning lights come on
  • Other GPWS modes are inhibited
27
Q

For how long are other GPWS modes inhibited in Mode 7?

A

For a minimum of five seconds after a windshear warning, and continues as long as the angle of attack is maintained within five degrees of stick shaker angle of attack

28
Q

What do the ground proximity warning computer and the stall warning computers provide on the PFD?

A
  • Windshear
  • Pull up
  • Pitch limit symbol
29
Q

What causes the stall warning computer to display pitch limit data on the PFD?

A

When the flaps are lowered

30
Q

With regards to the stall warning computer and the GPWS computer, what source selection is used on the PFD?

A

GPWS - no switching
Stall warning - Left PFD will use left stall warning computer, will automatically switch on a fault

Module 13 EASA Part 7 Book 3 (6 decks)

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