Appendix C Fuel Log

JOINT ADVANCED MULTI-ENGINE T-44A

APPENDIX C

FUEL LOG

Fuel logs are required on all cross country flights. All long range aircraft utilize fuel logs to assess mission

endurance and cross check fuel quantity gauges which may be subject to error. The primary purpose of the T-44A

fuel log is to expose student aviators to the procedures and considerations involved in proper inflight fuel

management. Entries are required as a part of preflight planning, prior to engine start, prior to takeoff, midway

through the climb, and at level-off. Every 30 minutes thereafter, entries are required to update fuel usage and on-

top-fuel. Indicated fuel quantity and fuel flow are always read directly from their respective gauges. The fuel log

provides a running tally of indicated fuel (the amount shown on the fuel gauges), computed fuel (the known fuel

quantity you started with minus fuel flow over a given time as referenced by the fuel flow gauges), and enroute time

remaining.

The following example is based on a flight commenced at 0800 with an OAT of 70F/21C, cruising altitude of

FL220, departing at sea level, taxiing at maximum ramp weight, and no alternate required.

Step 1. Preflight planning. Determine and record initial computed fuel. Based on an OAT of 70F/21C, NATOPS

25-13 gives a JP-5 fuel density of 6.75 lbs/gal. Take max usable fuel and multiply it by it's density (384 gallons X

6.75 lbs/gal.) to obtain an initial total computed fuel quantity of 2592 lbs or 1296 left/1296 right. Fuel density is

determined by the temperature of the fuel at the time of fueling and assumed to be the current temperature for the

first leg of the flight.

Step 2. Before engine start. Record the indicated fuel (off the fuel quantity gauges) and time immediately prior to

engine start (1250 left/1260 right at time 0745).

Step 3. Before takeoff. Normally right before you leave the runup to taxi to the active runway, record the indicated

takeoff fuel (1220 left/1210 right). Then calculate and record the computed fuel quantity. To figure the computed

takeoff fuel, assume the nominal 60 lbs. fuel burn (30 lbs per side) during the runup and subtract it from the initial

computed amount (2592 - 60 = 2532 lbs or 1266 left/ 1266 right).

Step 4. Record the actual takeoff time (0800).

Step 5. Midway through the climb. To account for an average fuel burn during the climb, note and record the fuel

flow halfway through the climb to cruising altitude (300 lbs/hr/engine at 11000 ft., in a climb to FL220).

NOTE: Steps 6 - 11 shall be performed at level-off and then every 30 min thereafter.

Step 6. Record the following information:

Time (0830).

Position (25 NM south of PSX). Note this in the remarks section.

Indicated fuel (off the fuel quantity gauges). (1050 left/1080 right).

Once aircraft accelerates and cruise power is set, note and record the fuel flow per engine (200

lbs/hr/engine) and the groundspeed (210 knots).

We now have the indicated fuel quantity and have enough information to calculate computed fuel quantity.

Step 7. Calculate and record computed fuel.

Level-off: To calculate the fuel burn during the climb, we multiply the time of climb (0830 - 0800 = 30min

or .5hr) by the average fuel burn during the climb (300 lbs/hr/engine). This yields a fuel burn of 300 lbs

total or 150 lbs per engine. Subtract this amount from the computed takeoff fuel of 2532 lbs (1266

left/1266 right) to obtain a computed fuel quantity of 2232 lbs or 1116 left/1116 right.

FUEL LOG C-1