Quantcast Figure 4-6 Computing Remaining EFRs

 

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CHAPTER FOUR
T-6A NAVIGATION
Fuel flow for training purposes is based on a NATOPS fuel flow at sea level and 180 KIAS
which is 480 pounds/hour or 8 pounds/minute.
Example: In Figure 4-5, the ETE between points A and B is 8+20 min. At 8 pounds/minute, this
equates to 70 pounds. Subtracting this Figure from an initial fuel quantity at point "A" will give
you the fuel remaining at point "B" (860 - 70 = 790)
Given the data in Figure 4-5, what is the EFR at C? The answer is computed in Figure 4-6.
Using the CR-2 computer, we find 92 pounds of fuel are required to get from B to C. This is
rounded up to 95 pounds, and then subtracted from 790 to get 695 pounds.
A to B:
B to C:
C to D:
MC
108
MC
087
MC
002
DIST
21.5
DIST
25
DIST
34.5
ETE
7+10
ETE
8+20
ETE
11+30
ALT
1500
ALT
1500
ALT
1500
EFR
635
EFR
790
EFR
695
AFR
AFR
AFR
MCF
MCF
MCF
BINGO:
BINGO:
BINGO:
Figure 4-6 Computing Remaining EFRs
Compute remaining EFRs for each point of your low-level routing in the same manner. Each
point has EFR and BINGO data, therefore; you will have one information block for each point on
your chart, including the target. The last information block, however, will indicate your first
heading and altitude after completing the low-level route.
Return Enroute EFRs
In order to compute mission completion fuels, we need to compute the EFR at the IAF. Using
the normal thrust climb chart, find the time, fuel, and distance required to climb to planned flight
altitude. For mission planning, assume your climb begins at sea level. Subtract the climb
distance from the total return leg distance to compute cruise distance. Given the following data,
compute the time and fuel required to reach the IAF:
Measured distance from low-level exit to IAF [via flight planned (stereo) route]: 79 NM From
Stereo Route listing: Level off altitude 9000 feet after low-level. EFR at low-level exit point:
480 pounds.
4-6
FUEL PLANNING, JET LOGS, DD 175


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