JCAB Oral

Question 1

Dry Crosswind limit? (787-8)

Answer 1

Dry - 35 (Takeoff), 33 (Landing)

Question 2

Wet Grooved crosswind limit?

Answer 2

25

Question 3

Wet Non Grooved crosswind limit?

Answer 3

20

Question 4

Flooded crosswind limit?

Answer 4

10

Question 5

Ice/snow BA Good crosswind limit?

Answer 5

20

Question 6

Ice/snow BA Medium to Good crosswind limit?

Answer 6

20

15 for runway less than 2500m

Question 7

Ice/snow BA Medium crosswind limit?

Answer 7

20

15 for runways less than 2500m

Question 8

Ice/snow BA Medium to Poor crosswind limit?

Answer 8

15

10 for runways less than 2500m

Question 9

Ice/snow BA poor crosswind limit?

Answer 9

10

Question 10

Slush 2mm or less crosswind limit?

Answer 10

15

Question 11

Slush 3 to 12mm crosswind limit?

Answer 11

10

Question 12

What fuel is prohibited for use?

Answer 12

JP-4 and Jet B

Question 13

When do auto brakes RTO operate?

Answer 13

• The airplane is on the ground
• Ground speed is above 85kts, and
• Both Thrust levers are retarded to idle

Question 14

What is TPR?

Answer 14

Turbofan Power Ratio.

Similar to EPR, TPR is a ratio measurement of high pressure compressor exit pressure to low pressure compressor inlet pressure, taking temperature into consideration. TPR Is much more accurate than N1

(P30 x √TGT)/(P20 x √T20) 
P30 - HP Compressor exit pressure 
TGT - LP Turbine Inlet Temp 
P20 - LP Compressor Inlet pressure 
T20 - LP Compressor Inlet Temp 

AOR 7.2.1

Question 15

When should the PIC consider an emergency landing?

Answer 15

• When checklist says “plan to land at the nearest suitable airport”
• When smoke/fumes or fire has started in the cabin and it’s elimination is unable to be confirmed.
• When there are only 2 AC power sources remaining
• Altimeter malfunction occurs and correct altitude cannot be confirmed by related procedures.
• Any other situation where significant adverse effects on safety may be possible if the flight continues

Question 16

What is PECS?

Answer 16

Power Electronics cooling system. The PECS is a liquid cooling system for the large motor power distribution system located in the aft E/E equipment compartment. The system consists of 2 independent liquid cooling loops. Liquid Quantities are show on the status display.

More info on..
AOM 2.20.14

Question 17

What happens if all ACEs fail?

Answer 17

Direct wiring from the flight deck to a spoiler pair and the stabilizer allow for pitch control through the ALTERNATE PITCH TRIM switches and roll control through the control wheel.

Question 18

Aircraft Dimensions? 787-8

Answer 18

Wingspan - 60.1 meters
Length - 56.7 meters
Height - 16.9 meters

Question 19

Which systems use hydraulics?

Answer 19

• Flight control actuators
• Landing Gear
• Nose Wheel Steering
• Thrust Reversers
• Flaps/Slats

Question 20

What are the effective ranges of an IAN approach?

Answer 20

25nm from MAP

from runway up to 6000ft

Question 21

For IAN approach, what must the temperature be at the destination airport?

Answer 21

Above -25c

AOM NP.21.3

Question 22

For IAN approach, what must you verify on the CDU legs page?

Answer 22

That the Glidepath (GP) angle is between 2.75 and 3.77

AOM NP.21.3

Question 23

For IAN approach, what should you use as minimums when there is no DA?

Answer 23

MDA plus 50ft.

AOM NP.21.4

Question 24

Main characteristics of RR Trent 1000 engines?

Answer 24

The main two features include:
Turbofan power ration (TPR) display
The shaft design (N1 N2 N3)