Warning Systems

Question 1

What are considered GPWS “radio altitude-based alerts?”

Answer 1

• Excessive Descent Rate
• Excessive Terrain Closure Rate
• Altitude loss after takeoff or go-around
• Unsafe terrain clearance when not in the landing configuration
• Excessive deviation below an ILS glideslope

FRM B737NG/MAX 15.2.6

Question 2

Additionally, how does the (E)GPWS provide “look-ahead terrain alerts?”

Answer 2

Using an internal world-wide terrain database.

FRM B737NG/ MAX 15.2.6

Question 3

What condition will inhibit a terrain alert?

Answer 3

An actual windshear warning (aircraft in windshear).

FRM B737NG/MAX 15.2.6

Question 4

Can terrain and weather radar show together on a display?

Answer 4

No. If one pilot selects terrain and the other pilot selects weather radar, each display updates on alternating sweeps.

FRM B737NG/MAX 15.2.6.1

Question 5

What conditions inhibit TCAS alerts?

Answer 5

GPWS and windshear warnings.

FRM B737NG 15.2.11/ FRM B737MAX 15.2.9

Question 6

What must an aircraft be equipped with to allow Resolution Advisories?

Answer 6

Mode C transponder.

FRM B737NG/MAX 15.2.11.1

Question 7

Why should TCAS be placed in TA ONLY when performance is limited, such as with an inoperative engine?

Answer 7

To prevent receiving RAs beyond the aircraft’s capabilities.

FRM B737NG15.2.11.3/ FRM B737 MAX 15.2.9.3

Question 8

GPWS windshear alerts are enabled below what altitude?

Answer 8

1,500 ft RA. GPWS Windshear detection begins at rotation.

FRM B737NG 15.2.7.1 /FRM B737 MAX 15.2.6.4

Question 9

When does the weather radar automatically begin scanning for windshear

Answer 9

(-700)
* Thrust levers set for takeoff, even if engine is off or IRS not aligned or
* in flight below 2,300 ft RA (predictive windshear alerts are issued below 1,200 ft RA)
(-800)
* Thrust levers set for takeoff or in flight below 1,800 ft RA (predictive windshear alerts are issued below 1,200 ft RA)
(MAX)
* Thrust levers set for takeoff, even if engine is off or IRS not aligned or
* in flight below 1800 RA (predictive windshear alerts are issued below 1,200 ft RA).

FRM B737NG 15.2.7.2/ FRM B737 MAX 15.2.6.4.2

Question 10

When are Predictive Windshear Cautions inhibited?

Answer 10

Between 80 kts and 400 ft RA

FRM B737 NG15.2.7.2.1/ FRM B737 MAX 15.2.6.4.3

Question 11

When are Predictive Windshear Warnings inhibited?

Answer 11

Between 100 kts and 50 ft RA

FRM B737 NG15.2.7.2.1/ FRM B737 MAX 15.2.6.4.3