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ATPL Instruments > GPWS > Flashcards

GPWS Flashcards

1
Q

What is GPWS

A

Ground proximity warning system

Also knows as TAWS (terrain awareness warning system)

Prevents CFIT

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2
Q

What does a basic GPWS system do

A

Monitors closure rate

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3
Q

What does an enhanced GPWS system do (EGPWS)

A

Ability to predict the terrain ahead

Used a global terrain database stored

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4
Q

What are the GPWS inputs

A 
Radio altimeter 
Airspeed
Barometer altitude 
Aircraft configuration 
ILS glideslope deviation
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5
Q

What height does GPWS have a active system

A

Between 50- 2450ft radio alt

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6
Q

What is GPWS flap inhibit button

A

Stops “too low flaps” when trying to land in a non standard config

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7
Q

What is GPWS gear inhibit button

A

Stops “too low gear” warning when gear up landing is intended

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8
Q

What is GPWS terrain inhibit button

A

Inhibit terrain look ahead function (EGPWS)

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9
Q

What is a genuine alert / warning

A

Actual / real warning / threat

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10
Q

What is a nuisance threat / warning

A

System is operating to its correct specification but no threat = can ignore in Vmc

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11
Q

What is a false warning/ threat

A

Warning that is completely wrong

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12
Q

What is mode 1 GPWS

A

Excessive rate of descent

Alert = “sink rate, sink rate”

Warning “whoop whoop pull up”

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13
Q

What is GPWS mode 2

A

Excessive terrain closure rate

Alert “terrain terrain”

Warning “whoop whoop pull up”

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14
Q

What is GPWS mode 3

A

Altitude loss after take off or go around

Alert “don’t sink”

Disabled 1000ft above ground

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15
Q

What is GPWS mode 4 A

A

Unsafe terrain clearance with gear up

Warning >190 knots <1000ft = “too low terrain”

Alert <190knots <500ft “too low gear”

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16
Q

What is GPWS mode 4 B

A

Unsafe terrain clearance with flap up

Warning >150 knots <1000ft =“too low terrain”

Alert <150 knots <245ft = too low flaps

17
Q

What is mode 5 GPWS mode

A

Descend below glideslope

Alert “glide slope”

1.3 does = soft alert
Full scale deflection = yells at you

18
Q

What is mode 6 A GPWS

A

Altitude call out

Alert “minimums”

19
Q

What is GPWS mode 6 B

A

Bank angle

Warning “bank angle”

20
Q

What is GPWS mode 7

A

Windshear

Warning “windshear”

Armed below 1500ft rad alt

21
Q

What is an alert

A

A caution which precedes a warning

22
Q

What is a warning

A

A command which must be followed

23
Q

What happens to TAWS is there is a inaccurate navigation system

A

Inaccurate TAWS ;

  • map shift
    a more common on older INS or IRS with no gps

GPWS part of system continues to function normally

24
Q

What are EGPWS warnings based on

A

Time to impact

This is why some circling approaches and go-around a have limiting speeds

25
Q

When does the warning for a EGPWS start

A

20/30 seconds from impact

26
Q

What does the caution for EGPWS start

A

40/60 seconds from impact

27
Q

On GPWS does black represent

A

> 2000 feet below

28
Q

On GPWS does green represent

A

500-2000’ below

29
Q

On GPWS does yellow / amber represent

A

Up to 2000’ above

30
Q

On GPWS does red represent

A

> 2000’ above

31
Q

What happens to the colours on GPWS when you enter the time restrictions to impact

A

Pickle colours change to solid colours

Only thing shown on ND is GPWS

32
Q

What is terrain clearance floor (TCF)

A

Around nearest runway

Available for all runways >3500ft

Outer limit is up to 700ft and extends to infinite or where it meets another runway TCF

If floor penetrated “too low terrain”

33
Q

What must the 2 classes of TAWS have

A

A and B

Must have forward looking terrain avoidance (FLTA) with suitable visual and aural alerts

34
Q

What aircraft are required to have GPWS

A

> 5700kg
Or
9 passengers

Class A

ATPL Instruments (18 decks)

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