TAWS/GCAS/RADAR

Question 1

Which are the only 2 GCAS warnings that can be inhibited?

Answer 1

GLIDESLOPE

TOO LOW FLAPS

Question 2

What are the 3 states of GCAS operation?

Answer 2

Power up
Ground
Flight

Question 3

When is the aircraft takeoff configuration checked?

Answer 3

WOW and any 3 power levers are above 40 degrees

Question 4

What are the 2 GCAS mission modes?

Answer 4

Normal

Tactical

Question 5

What’s the difference between normal and tactical mode for the GCAS?

Answer 5

Normal - based on normal flight profiles / optimized to detect CFIT and unsafe flight conditions

Tactical - allow more aggressive, tactically oriented flight

Question 6

How many different GCAS modes of operation are there?

Answer 6

8

Question 7

Describe Mode 1 - Excessive Descent Rate

Answer 7

Whenever ac between 30 and 2450 AGL
Inner and outer envelope provided (both altered when in tactical and gear down / inhibited when in tactical and gear up)

Outer envelope - SINK RATE
Inner envelope - PULL UP

Question 8

Describe Mode 2 - Excessive Terrain Closure Rate

Answer 8

Based on RADALT and how quickly Radar altitude is decreasing

Envelope adjusted based on configuration and speed

If penetrated - TERRAIN TERRAIN
if not exited and if flaps and gear are up and not in tactical mode - WHOOP WHOOP PULL UP

Question 9

Describe Mode 3 - Excessive Altitude Loss After Takeoff

Answer 9

30 to 2450 AGL - DONT SINK

disabled if both gear and flaps are down
disabled if in tactical mode and above 200 ft

Question 10

Describe Mode 4 - Unsafe Terrain Clearance

Answer 10

Mode 4A/B
TOO LOW GEAR - airspeed below 178 and below 400 AGL
TOO LOW TERRAIN
Tactical - lowered to 150 AGL

Mode 4C