Warning Systems

Question 1

What does the TERR pb do when selected OFF?

Answer 1

Terrain category warnings are inhibited.

*basic modes are unaffected.

Question 2

What happens when GPWS SYS pb is selected OFF?

Answer 2

All 5 basic modes are inhibited.

*terrain category is not affected.

Basic GPWS Categories:
1. Excessive descent rate.
2. Excessive terrain closure rate.
3. Altitude loss after takeoff or go-around.
4. Unsafe terrain clearance and landing configuration.
5. Excessive deviation below glideslope.

Question 3

What are the 5 Basic GPWS Categories?

Answer 3

1. Excessive descent rate.
2. Excessive terrain closure rate.
3. Altitude loss after takeoff or go-around.
4. Unsafe terrain clearance and landing configuration.
5. Excessive deviation below glideslope.

Question 4

What are the Terrain Categories?

Answer 4

Uses a worldwide terrain database and GPS position.

1. Terrain Clearance Floor (TCF).
2. Runway Field Clearance Floor (RFCF).
3. Predictive Warning (Ribbons).

Question 5

Excessive Descent Rate- what will trigger a “SINK RATE” followed by a “PULL UP” warning?

Answer 5

Excessive rate of descent below 2450 ft RA.

Question 6

Excessive Terrain Closure. What triggers “TERRAIN TERRAIN” and “PULL UP”?

Answer 6

Uses radalt to detect rapidly rising terrain.
-First envelope generates aural warning and GPWS lights.
-Second envelope red PULL UP lights.

Question 7

Unsafe Terrain Clearance. What are the 3 modes?

Answer 7

Form 4A- gear and flaps not in landing config (also protects against gear up landing.

Form 4B- gear down and flaps not in landing config.

Mode 4C- warns if terrain rising on climb out (compliments Mode 3)

*4A and 4B active during cruise and approach. Must perform go around if “TOO LOW FLAPS” or “TOO LOW GEAR”.

Question 8

Mode 5 Excessive Deviation Below Glideslope. What are the two levels of alerting?

Answer 8

Soft alert- below 1000 ft RA and 1 1/3 dots below glideslope.

Hard alert- below 300 ft RA and 2 dots below glideslope.

Question 9

When is a TCAS TA generated and how is it displayed?

Answer 9

If an intruder is a ”potential collision threat” -approx 40sec TAU.

Amber circle and aural warnings.

Question 10

What are the two types of TCAS RAs?

Answer 10

Preventative advisory- keep VS outside of red area.

Corrective advisory- keep VS in green area.

Question 11

What happens to TCAS RA warnings below 1000ft AGL?

Answer 11

All warnings and aural messages are inhibited, however TA intruder aircraft are still displayed on the ND.

Question 12

FACs are responsible for Low energy detection and will provide aural “SPEED” warning if threshold values are reached. When is it active?

Answer 12

-Below 2000ft and above 100ft AGL.
-flaps in config 2 or greater.
-Alpha Floor is not engaged.

Question 13

FACs are responsible for detecting windshear during takeoff and landing. When is it available and what happens?

Answer 13

-Below 1300ft AGL.
-Flaps 1 or greater.

“WINDSHEAR” aural warning and FDs provide guidance to recover.

Question 14

What are the 4 levels of priority for alerts/warnings?

Answer 14

1. Stall warnings.
2. Windshear warnings.
3. GPWS warnings.
4. TCAS warnings.

Question 15

What is the maximum range of TCAS?

Answer 15

30 NM either side and approx 30 NM to 80 NM longitudinally, 9 900 ft above and below.

Question 16

When is a TCAS RA generated and how is it displayed?

Answer 16

If an intruder is a “real collision threat” -approx 25sec TAU.

Red square, aural messages and PFD orders.

Question 17

What is a TCAS “Proximate intruder” and how is it displayed?

Answer 17

No collision threat- intruder in the vicinity of the A/C (closer than 6 NM laterally and ±1200 ft vertically).

Filled white diamond.