Quantcast Figure 4-5 EFR Calculations for the First Low-Level

 

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T-6A NAVIGATION
CHAPTER FOUR
Interpolating the data in Figure 4-3, we determine the descent figures of 10 NM, 13 pounds
rounded up to 15 pounds, and 2.5 minutes per 4000 feet altitude. Using the climb and descent
distances, the distance flown at cruise is computed as follows:
83 (Total distance from takeoff to PT A)
- 20 (10 + 10, Total distance in climb and descent)
63 (Distance flown at cruise)
Using the cruise fuel flow data, compute the fuel required to fly 63 NM at 240 KTAS. Dividing
63 NM by 4.0 NM per minute (240 KTAS) gives us 15 + 45 minutes. We interpolate fuel flows
for 240 knots at 10,000 feet and arrive at 450 pounds per hour, or 7.5 pounds per minute,
rounded to 8. Multiplying cruise time by fuel flow per minute = 15 x 8 = 126 (round up to the
next higher five pounds) or 130 pounds.
Subtracting, the cruise and descent fuels to Point A:
1005 ( Fuel remaining after climb)
-145 ( 15 + 130 or cruise plus descent fuel)
860 ( Estimated fuel remaining at Point A)
NOTE
In the previous example, we assumed winds were light and
variable. Remember, Ground Speed (not TAS) is used to compute
enroute times. Since winds affect your enroute times and thus your
EFR data, compute IFR enroute portions of the jet card using best-
known winds.
Remaining Low-Level Route EFRs
Given the EFR at point "A," the fuel flow, and ETEs between turnpoints, we can calculate the
EFRs for the first low-level. Round all computed leg fuels to the next highest five pounds.
A to B:
B to C:
C to D:
MC
108
MC
002
MC
087
DIST
21.5
DIST
25
DIST
34.5
ETE
7+10
ETE
8+20
ETE
11+30
ALT
1500
ALT
1500
ALT
1500
EFR
EFR
790
EFR
AFR
AFR
AFR
MCF
MCF
MCF
BINGO:
BINGO:
BINGO:
Figure 4-5 EFR Calculations for the First Low-Level
FUEL PLANNING, JET LOGS, DD 175
4-5


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