Given the following information for a Commercial Air Transport flight, what is the time (in minutes) needed from the destination to the alternate aerodrome? Assume an operation with a Performance Class A aeroplane applying the Basic Fuel Scheme or with a helicopter (the basic fuel planning provisions are the same).
Missed approach at the destination: 6 min
Climb to cruise level: 8 min
Cruise distance: 55 NM
Cruise TAS: 165 kt
Headwind: 10 kt
Expected holding at the alternate: 10 min
Descent to the alternate: 6 min
Approach to the alternate: 6 min
The time required from the destination to the alternate aerodrome is the sum of the following:
- Time for a missed approach from the applicable MDA/DA at the destination aerodrome to the missed approach altitude: 6 min.
- Time to climb from missed approach altitude to cruising level/altitude, taking into account the expected departure routing: 8 min.
- Time to cruise from top of climb to top of descent, taking into account the expected routing: Cruise distance / Groundspeed = 55 NM / (165 kt - 10 kt) = 0.35 hr or 21 min.
- Time for descent from top of descent to the point where the approach is initiated, taking into account the expected arrival procedure (for this question additional time for holding at the alternate is expected): 6 min + 10 min = 16 min.
- Time for executing an approach and landing at the destination alternate: 6 min.
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