Figure 4-3 Fuel Analysis

INSTRUMENTS FLIGHT PLANNING

CHAPTER FOUR

Figure 4-3 Fuel Analysis

To estimate fuel to the IAF, read across the MAI line and find the time remaining to the IAF.

Sixteen minutes at a fuel flow of 240 PPH = 64 lbs. We can estimate that our fuel at the IAF is

600 minus 65 lbs (64 lbs rounded up to the nearest 5 lbs) or 535 lbs.

NOTE

This method is preferred when TAS remains constant and your

route includes major course changes that normally invalidate GSs

computed in flight. Here are two cases when you should not use

this method:

When TAS has changed; or

When the calculated GS remains constant for subsequent legs

of the flight (e.g., cross county flights).

In both cases, new ETEs are calculated based on distance divided by GS. Use these ETEs for

fuel and time estimates.

Your jet log is segmented into columns, which may aid you in your calls. This is merely a

suggested system. It may be easier for you to tabulate the numbers on another sheet of paper. In

any case, the one presented in Figure 4-3 has space for fuel (+ or preflight), fuel flow estimates

to the IAF, and a MISC column which you can use for any notes.

The three separate calls are summarized below:

TWO-MINUTE PRIOR Call

Outbound heading for course

ETA to next checkpoint

TWO-MINUTE PRIOR, MARK-ON-TOP AND WINGS LEVEL CALLS

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