B787 #15 Warning Systems

Question 1

What is the Thrust Asymmetry Speed (TAMS)?

Answer 1

TAMS varies with weight and CG but is always at least 10 kts above the minimum control speed during TAKEOFF and GO-AROUND. When airspeed decreases to TAMS, there is an AIRSPEED AIRSPEED aural sound and the Master WARNING light illuminates. AOM 15.20.14

Question 2

What will cause a Takeoff Configuration warning?

Answer 2

When either engine’s thrust is in the takeoff range and:

• Cargo and or passenger DOORS are not secured and locked
• Leading edge and/or trailing edge FLAPS are not in the takeoff position
• PARKING BRAKE is set
• RUDDER TRIM is not centred
• SPEEDBRAKE lever is not down
• STABILIZER not within the green band

AOM 15.20.16

Question 3

What conditions will cause a SPEEDBRAKE, SPEEDBRAKE warning alert during landing and a rejected takeoff advising SPEEDBRAKE has not deployed?

Answer 3

• Airplane is on the ground
• BOTH thrust levers not in the takeoff thrust position
• Groundspeed exceeds 85 kts
• SPEEDBRAKE lever position is less than 35 degrees
  All the above have to occur together for 1 sec

AOM 15.20.18

Question 4

At what range will a TCAS RA be provided and what symbol will be displayed on the ND?

Answer 4

15 to 35 secs and a FILLED RED SQUARE

AOM 15.20.21

Question 5

At what range will a TCAS TA be provided and what symbol will be displayed on the ND?

Answer 5

20 to 48 secs and FILLED AMBER CIRCLE

AOM 15.20.21

Question 6

At what range will a TCAS proximate traffic alert be provided and how will it be displayed on the ND?

Answer 6

Neither a RA or TA but within 6 NM AND 1200 ft vertically and a filled WHITE DIAMOND.

AOM 15.20.22

Question 7

When will a TCAS ‘OTHER TRAFFIC’ alert be displayed and what symbol will be used on the ND?

Answer 7

Within the ND display limits but is neither a RA, TA or PROXIMATE TRAFFIC displayed as a hollow WHITE DIAMOND.

AOM 15.20.22

Question 8

Approximately how long after the weather radar is turned on before Predictive windshear alerts are enabled?

Answer 8

12 secs. However, the weather radar begins scanning for windshear with WXR switch on or off, when the THRUST of either engine is in the TAKEOFF range and thrust reversers are not unlocked or deployed.

AOM 15.20.45

Question 9

In flight, with the WXR switched pushed or not pushed, when will the weather radar begin scanning for windshear?

Answer 9

Below 2300 ft radio altitude but the Predictive windshear alerts are ENABLED below 1200 ft radio altitude.

AOM 15.20.45

Question 10

At what distance will a PWS WARNING or CAUTION alert occur on the GROUND?

Answer 10

A PWS WARNING will only occur directly in front of the aircraft at a distance of 3NM.
A PWS CAUTION will occur within a cone 30 degrees either side of the aircraft up to 3NM.

AOM 15.20.45

Question 11

At what distance will a PWS WARNING and CAUTION occur during FLIGHT?

Answer 11

When the aircraft is below 1200 ft:
WARNING will occur directly in front of the aircraft up to 1.5 nm
CAUTION will occur in a cone 30 degrees either side of the aircraft up to 3 nm

AOM 15.20.45

Question 12

When does an IMMEDIATE WINDSHEAR alert occur?

Answer 12

During TAKEOFF: from ROTATION to 1500 ft
During APPROACH: 1500 ft to 10 ft
During MISSED APPROACH: until 1500 ft

AOM 15.20.44

Question 13

What other alerts does an IMMEDIATE WINDSHEAR alert inhibit?

Answer 13

• All PWS alerts
• TCAS (including RA)
• other GPWS alerts

AOM 15.20.48