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A320 Systems reviewer > GPWS > Flashcards

GPWS Flashcards

1
Q

What does EGPWS stand for?

A

Enhanced Ground Proximity Warning System

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2
Q

What is the difference between GPWS and EGPWS?

A
  1. GPWS does not have forward looking capability. Radar based terrain detection.
  2. EGPWS has forward looking terrain capability. Data base based and not radar based.
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3
Q

How do the pilots monitor each ILS’s information?

A

Both EFIS must display Rose Nav to see the others ILS

Captain PFD (ILS 1), ND (ILS 2) & FO PFD (ILS 2), ND (ILS 1)

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4
Q

Purpose of the GPWS?

A

Enhance safety by alerting crew to:

  1. Terrain collisions
  2. Incorrect aircraft configurations
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5
Q

Will the GPWS be overridden when there is a stall or windshear warning?

A

Yes

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6
Q

Can the GPWS prevent an impact with a clear, vertical cliff face?

A

No. GPWS has no forward looking capability

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7
Q

How does the EGPWS compute for terrain?

A

FMGS position with Terrain database

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8
Q

Which PB in the GPWS controls the basic GPWS system and which controls the Enhanced “looking forward” part of the EGPWS?

A
  1. SYS - controls the basic GPWS sys

2. TERR - controls the Enhanced ”Looking Forward” section

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9
Q

What are the 5 basic modes for GPWS?

A

Mode 1 - excessive rate of descent: “sink rate”
Mode 2 - excessive terrain closure: “terrain terrain, pull up”
Mode 3 -altitude loss after take off: “don’t sink”
Mode 4 - unsafe terrain clearance & not in landing configuration: “too low (terrain, gear, flaps)”
Mode 5 - descent is below the glide slope: “glide slope”

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10
Q

When the Terr PB on the is pressed, what is displayed on the ND when both Terrain and Weather data is on?

A

Terrain

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11
Q

If Terr (EGPWS) fails, do you lose Sys (basic mode 1-5 GPWS) as well?

A

No. The two systems are separate.

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12
Q

What is the GPWS warning for high rate of descent at low level. What if the rate becomes excessive?

A
  1. “Sink rate, sink rate”

2. Excessive: woop, woop, pull up!

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13
Q

What do the colors stand for in Terrain?

  1. Red
  2. Amber
  3. Green
  4. Light green
  5. Purple
  6. Yellow
  7. Black
A
  1. Red - up to 2,000’ above us
  2. Amber - up to 1,000’ above us
  3. Green - 1,000’ below us
  4. Light green - 2,000’ below us
  5. Purple - unkown area
  6. Yellow - less 1,000’ above and less 1,000’ below
  7. Black is water
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14
Q

What is the GPWS warning if rising ground is detected and if also the warning has been repeated twice?

A
  1. Terrain, Terrain

2. After Terrain warning has been repeated twice, Woop, Woop, Pull Up!

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15
Q

If the GPWS detects a rate of descent after an initial climb or following a go around, what is the GPWS warning?

A

Don’t Sink, Don’t Sink

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16
Q

If the landing gear and flaps are retracted and too close to the ground, what is the aural warning?

A

Too low, terrain

17
Q

At very low levels, what is the warning when the landing gear is still retracted?

A

Too low, gear

18
Q

If the gear is down but the flaps are not in the correct configuration then the call out?

A

Too low, Flaps

19
Q

Which is the priority between too low gear or too low flaps?

A

Too low gear has priority

20
Q

What is the aural warning when the aircraft is significantly below the glide slope? What happens if no corrective actions are done?

A
  1. Glide Slope.

2. No corrective actions, the aural warning becomes louder

21
Q

How to tell on the ND that EGPWS is fitted in the aircraft?

A

TERR is displayed. Not Tilt.

22
Q

What will happen when you get a terrain caution alert and the Terrain on ND PB is off?

A

If a caution warning is generated, the Terr on ND will automatically come and display terrain information on the ND

23
Q

Does the Enhanced ground proximity protect agains barometric setting error? Which between FM 1 or 2 calculates terrain? What other danger is there for the for Enhanced section?

A
  1. No
  2. The system is calculated using FM 1.
  3. The Enhanced system does not protect again FM 1 position errors
24
Q

What happens when the aircraft position accuracy becomes “low” as confirmed on the MCDU Prog Page?

A

“Terr STBY” on the ND and the system is automatically deselected. The basic GPWS remains.

A320 Systems reviewer (24 decks)

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