Warning Systems

Question 1

Q.7.1. 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.

Reference: FRM B737NG/MAX 15.2.6

Question 2

Q.7.2. Additionally, how does the (E)GPWS provide “look-ahead terrain” alerts?

Answer 2

Using an internal world-wide terrain database.

Reference: FRM B737NG/ MAX 15.2.6

Question 3

Q.7.3. What condition will inhibit a terrain alert?

Answer 3

An actual windshear warning (aircraft in windshear).

Reference: FRM B737NG/MAX 15.2.6

Question 4

Q.7.4. 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.

Reference: FRM B737NG/MAX 15.2.6.1

Question 5

Q.7.5. What conditions inhibit TCAS alerts?

Answer 5

GPWS and windshear warnings.

Reference: FRM B737NG 15.2.11.2/ FRM B737MAX 15.2.9.2

Question 6

Q.7.6. What must an aircraft be equipped with to allow Resolution Advisories?

Answer 6

Mode C transponder.

Reference: FRM B737NG/MAX 15.2.11.1

Question 7

Q.7.7. 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.

(opens in a new tab)Reference: FRM B737NG15.2.11.3/ FRM B737 MAX 15.2.9.3

Question 8

Q.7.8. GPWS windshear alerts are enabled below what altitude?

Answer 8

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

                                                                              Reference: FRM B737NG 15.2.7.1 /FRM B737 MAX 15.2.6.4.1

Question 9

Q.7.9. 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).

(opens in a new tab)Reference: FRM B737NG 15.2.7.2/ FRM B737 MAX 15.2.6.4.2

Question 10

Q.7.10. When are Predictive Windshear Cautions inhibited?

Answer 10

Between 80 kts and 400 ft RA.

(opens in a new tab)Reference: FRM B737 NG15.2.7.2.1/ FRM B737 MAX 15.2.6.4.3

Question 11

Q.7.11. When are Predictive Windshear Warnings inhibited?

Answer 11

Between 100 kts and 50 ft RA.

(opens in a new tab)Reference: FRM B737 NG15.2.7.2.1/ FRM B737 MAX 15.2.6.4.3

Question 12

Q.7.12. You are terminating a MAX aircraft at a non-maintenance base/station and during the Parking Checklist you observe the Number One Engine oil is at 69%. What are your responsibilities?

Answer 12

The Captain must arrange for engine oil servicing.

(opens in a new tab)Reference: AOM 3.8.4