Inflight 6: Revising Estimates

1 / 4

Which is an example of a situation where your original Top of Descent (TOD) calculation made in planning, must be revised in the air?

If you have changed to a different cruising altitude

If you estimate that you may want to make a radio call at the same time of TOD

If you have diverted off track due weather

Both a & c

2 / 4

In the sling, the common power setting for a descent is 4000rpm with an IAS of 100 kts. What rate of descent (in feet per minute) does this usually achieve?

700 fpm

1000 fpm

3000 fpm

500 fpm

3 / 4

When flying at 60kts (60nm/hr) you are travelling 1 nm per minute, or 1 minute per nautical mile. Therefore, at the average cruise speed of 120 kts, how many minutes (approximately) will it take to fly 1 nautical mile?

1 and ½ minutes

2 minutes

½ a minute

6 minutes

4 / 4

To be safe, it is advisable when calculating a top of descent (TOD) that you:

Stick to your original TOD calculated in the planning stages, to save confusion once in the air

Round to the largest figure, so that by beginning the descent early, it will be complete before reaching your destination

Descend as the fastest rate possible, to allow time for your inbound procedures

Always communicate your TOD time and distance with other aircraft around you

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