Exam Review: GPWS

Question 1

What is GPWS?

Answer 1

Ground Proximity Warning System

Question 2

What is the purpose of GPWS?

Answer 2

Prevent CFIT by proving AURAL/VISUAL warning

Question 3

What are the 8 INPUTS of GPWS?

Answer 3

1. GS Deviation
2. Barometric Alt rate
3. IAS
4. Rad Alt
5. DH Trip Point
6. Flap position
7. Gear up/down
8. Self test

Question 4

What is mode 1?

Answer 4

Excessive Descent Rate (baro sink)

Question 5

If the initial warning is “SINK RATE” what mode is it?

Answer 5

1 (EDR)

Question 6

This mode is divided into 2 and tells us when CLOSURE rate is too high

Answer 6

2

Question 7

What is mode 2a and 2b?

Answer 7

2a: Flaps<25
2b: Flaps>25

Question 8

What does mode 2a tell us?

Answer 8

Compares Rad alt with Rad alt closure rate

TERRAIN TERRAIN

Question 9

How is mode 2b deactivated?

Answer 9

200’-600’ depends on BARO sink rate

Question 10

What is Mode 3?

Answer 10

Descent After Take Off (DATO)

Question 11

This mode warns of excessive BAROMETRIC Alt loss after take off/go around, aurally says “DONT SINK”

Answer 11

Mode 3

Question 12

This mode operates during LANDING and advises of insufficient terrain clearance when A/C

Answer 12

Mode 4

Question 13

What are the 2 modes of 4?

Answer 13

4a: Retracted
- <190 TOO LOW GEAR
- >190 TOO LOW TERRAIN

4b: EXTENDED
- <154 TOO LOW FLAPS
- >154 TOO LOW TERRAIN

Question 14

What does Mode 5 tell us?

Answer 14

Below Glideslope (1000’)

Question 15

This mode warns us of excessive BANK ANGLE

Answer 15

Mode 6

Provides Rad Al readout

Question 16

What does mode 7 do?

Answer 16

Windshear Protection

warns of microburst