Figure 5-1 Cross City/Gainsville

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