Figure 6-10

STUDENT GUIDE

VISUAL NAVIGATION

Figure 6-10

6.5.8. Computing the Time

6.5.8.1. With leg distances measured and annotated on the worksheet, compute leg times using

300 kts ground speed. This ground speed equates to 5 miles per minute or 1 mile each 12

seconds. As distances are rounded to the nearest .5 mile, the leg times should be in multiples of

six seconds (.5 NM=6sec at 300 kts). Record and total time computations on the data worksheet.

6.5.9. Plotting Time Ticks

6.5.9.1. As with T-34 VNAV charts, draw time ticks at 1 minute intervals. However, at 300 kts

this equates to every 5 miles. Each time tick extends 3 miles either side of track, with each third

tick extending 5 miles. For legs following the first leg, measure time tick distance backwards

along the track as described in Unit 2. Time ticks are labeled at every third minute, and all

annotations are in black ink.

6.5.10. Computing Fuels

6.5.10.1. For T-1 aircraft, use a fixed fuel flow of 1800 lbs./hr to plan your low-level. This

yields a thirty pounds per minute fuel flow. Round computed data up to 10-pound increments,

such that 193 lbs. of fuel consumed becomes 200 lbs.

6.5.10.2. For T-39 aircraft, use a fixed fuel flow of 3000 lbs./hr to plan your low-level. This

yields a 50 lbs./min fuel flow. Continue to round computed data up to the next 10-pound

Increment.

6.5.11. Measure Bingo Distances

6.5.11.1. Derive BINGO information as was done for T-34 mission planning, only use T-1A / T-

39 Bingo Data tables located in the T-1A/T-39 In-flight Guide. When measuring distances, use

the distance from the point direct to the planned destination; do not use a turn radius. For low-

6-13