GROUND PROXIMITY WARNING SYSTEM (GPWS)

Question 1

1. The GPWS the alert/warning information is provided by a radio altimeter with:

Answer 1

b. a downward transmitting beam whose dimensions are in the order of 30 and 60 in the fore/aft and the athwartship axes.

Question 2

2. The GPWS would provide visual and audible warning to a pilot if the aircraft descended:

Answer 2

d. to below 200’ radio altitude with flap not in the landing position and speed below Mach.28.

Question 3

3. The Ground Proximity Warning mode 5 provides a visual and audible warning to the pilot if the aircraft:

Answer 3

b. is below 1000ft radio altitude and more than 1.3 dots below the ILS glidepath.

Question 4

4. The GPWS uses inputs from:

Answer 4

c. the radio altimeter, the Air Data Computers, the Captain’s ILS receiver, the landing gear position indicators and the flap position indicators.

Question 5

5. The Ground Proximity Warning mode 4a provides a visual and audible warning ‘Too Low Gear’ to the pilot if the aircraft descends below _ _ _ _ _ _ with landing gear retracted.

Answer 5

c. 500 feet radio altitude with speed below M 0.35.

Question 6

An aircraft ‘goes around’ after descending to a radio alt of 190 feet. As power is applied a power unit is lost and some height is lost. The GPWS would provide an alert when the aircraft had lost about:

Answer 6

b. 20 feet

Question 7

GPWS Mode One gives warning of:

Answer 7

a. excessive descent rate.

Question 8

GPWS, Mode Three gives warning of:

Answer 8

b. height loss after take-off/missed approach.

Question 9

GPWS, mode two operates between:

Answer 9

a. 50ft and 2450ft agl

Question 10

With reference to GPWS:

a. In all six modes the audible alerts and warnings are accompanied by the red flashing PULL-UP’ light.
b. Mode 4A activates when the aircraft descends below 500ft radio altitude at a speed less than .35Mach with the landing gear retracted.
c. Mode 4A activates when the aircraft descends below 500ft barometric altitude at a speed less than .28Mach with the landing gear retracted.
d. Mode 6 re-arms when the aircraft leaves the hard alerting area.

Answer 10

b. Mode 4A activates when the aircraft descends below 500ft radio altitude at a speed less than .35Mach with the landing gear retracted.

Question 11

An aircraft ‘goes around’ after descending to a radio altitude of 190ft. As power is applied a power unit fails and some height is lost. The GPWS would provide an alert when the aircraft had lost about:

Answer 11

b. 20ft

Question 12

GPWS mode 3 will operate if altitude loss occurred before you have acquired:

Answer 12

d. 700 ft terrain clearance.

Question 13

13. With reference to GPWS Mode 4. At or below what radio altimeter altitude is mode 4 activated if not in the landing configuration?

Answer 13

700 ft

Question 14

14. Mode 4 gives warning of:

Answer 14

unsafe terrain clearance when not in the landing configuration.