Miscellaneous

Question 1

What is meant by ACN/PCN?

Answer 1

ACN is the a/c classification number and measures the stress the a/c puts on the pavement. Affected by number of wheels, tyre pressure and weight).
PCN is the strength of the pavement.

Question 2

Can you use the pavement is ACN>PCN?

Answer 2

If only a little above, may be able to organise with airport company.

Question 3

Decode the following…

PCN 50 F/A/X/T

Answer 3

PCN 50
F means flexible surface (could be rigid)
A means high strength (B med, C low, D ultra low) pavement
X means tyre pressure
T means value determined by tech evaluation (or could be U by usage)

Question 4

What is the mean aerodynamic chord?

Describe how to find CoG as a % of the MAC

Answer 4

Is the mean chordwise component of a wing.
Identify the CoG in inches from the datum and the LE MAC from datum.
(CG-LEMAC)/MAC X 100 = %MAC

Question 5

What actions are taken in a rejected T/O?

Answer 5

• Close throttle
• Apply max brakes/monitor auto brake
• Reverse thrust
• Speed brakes/spoilers

Question 6

Describe the process of a low speed rejected T/O

Answer 6

Occurs below 80kt

• Memory items
• Address failures
• Communicate
• Make decision

Question 7

Describe the process of a high speed rejected T/O

Answer 7

Above 80kt and captain makes decision to reject after V1
-Memory items
-Address failures
-Communicate (ATC/Cabin crew/emergency)
-Stop on RWY
—Brake energy calculations to see if tyre fire/burst

Question 8

What happens if EF occurs before Vef?

Answer 8

Safety margins are reduced as longer 1 engine acceleration.
TOD/TOR longer
Reduced obstacle clearance
Climb gradients are unaffected

Question 9

What shall be done in case of engine fire during T/O?

Answer 9

Assuming at Vef an engine fire:

• 400ft communicate with PF/PM
• Confirm failure
• Memory items
• Shut down correct engine

Question 10

Performance wise, which is better? An engine failure or fire

Answer 10

Fire, as still produces thrust.

A failed engine will produce none so 50% total produced.

Question 11

What is the minimum turn around time?

Answer 11

Limited by brake heat.

So add energy for last landing, taxi and RTO and subtract energy for time on ground

Question 12

How does filling up the centre and wing tanks change the CoG?
How does this affect efficiency?

Answer 12

Fill centre, aft. Empty centre, fore.
Fill wings (due sweptback/dihedral) aft, empty fore.
As CoG moves fore, efficiency decreases.

Question 13

What is committal height?

Answer 13

Upon reaching this altitude you are committed to landing.

Not applicable to large jets, more so turbo props/light twins.

Question 14

What considerations in case of fuel leak?

Answer 14

Diversion fuel?
Damage?
Crossfeed (both engines leaked tank then other)
Checklists (some require engine shutdown for diagnosis)