Figure 4-7 MCF Less Than EFR

CHAPTER FOUR

T-6A NAVIGATION

MCFpt = EFRpt - (EFRiaf - 280

or , for Point A in Figure 4-7:

MCFpt = 801 (325 - 280)

MCFpt = 756

Assuming an IAF EFR of 325 pounds, what are the remaining MCFs for Figure 4-5? The

answers are shown in Figure 4-7.

Since wind affects EFR and MCF data, compute all enroute/high altitude portions of the flight

(which affect EFR data) using best available wind data. For this reason, write EFR and MCF

data on the chart in pencil, and compute them just prior to mission briefing.

What if your computed MCF is less than your EFR? In this situation, you may still attempt to fly

the sortie, but only with a plan to shorten the mission (such as the fuel limiter routing, VNAV 4)

either in low-level or by only planning one approach.

A to B:

B to C:

C to D:

002

087

108

DIST

34.5

DIST

21.5

ETE

8+20

ETE

11+30

ETE

7+10

ALT

1500

ALT

1500

ALT

1500

EFR

801

EFR

706

EFR

540

AFR

MCF

756

MCF

661

MCF

510

BINGO:

Figure 4-7 MCF Less Than EFR

408. DETERMINE BINGO DISTANCE, FUEL, MAGNETIC COURSE, AND

ALTITUDE (BINGO)

The last portion of the information box is Bingo data. This entry states the minimum fuel,

heading, and altitude required to safely execute mission abort at a point on the low-level route

and arrive over the destination with IFR fuel minimums.

To compute the information, first determine magnetic course and straight line distance between

each turnpoint and NPA. (Do not actually draw this line on your chart.) Note in Figure 4-8 the

distance is measured from the point directly to the field, not the IAF. Use this distance and

interpolate the BINGO information for the given point.

4-8

FUEL PLANNING, JET LOGS, DD 175