Figure 5-1 Cross City/Gainsville

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INSTRUMENTS FLIGHT PLANNING
CHAPTER FIVE
Figure 5-1 Cross City/Gainsville
Example
MARK-ON-TOP Gainesville ...........Time 30+00 (Remember minutes and seconds only)
MARK-ON-TOP Cross City..............Time 40+00
You have transited 36 NM in 10 minutes, therefore:
36/10 = 3.6 NM/Min = 216 kts GS
Since your TAS is 210, you have a 6 kt tailwind component.
503.
REVISING ETA
On your instrument flights, you are to inform your instructor of your new ETA for the following
checkpoint if your previous ETA is in error by more than 30 seconds.
504.
REVISING EFR
To calculate EFR at the IAF multiply the time remaining from your jet log by your current fuel
flow. Subtract this figure from the present fuel quantity to get the EFR at the destination IAF.
These revisions are required whenever your previous estimate is in error by more than 30 lbs of
fuel in the T-34C/T-6A, and 100 lbs in the T-39N.
The following is a comprehensive example of how ETA and EFR are revised in flight. Use your
jet log and enroute chart (Figures 5-2 and 5-3).
IN-FLIGHT FUEL AND TIME ANALYSIS
5-3

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