Figure 1-10 Timing Triangle Corrections

LOW-LEVEL AND TACTICAL FORMATION

CHAPTER ONE

next turnpoint. Just take the difference of what you are going to fly and the

original track. Be sure that if you maneuver off-course more than 5 miles you

figure a new MSA for your new course.

Figure 1-10 Timing Triangle Corrections

ii.

Proportional Method. For every second off of your planned ETA, change

your IAS by 1 kt and hold this new airspeed for the number of minutes equal to

your GS in miles per minute. For example, you are traveling at 3.0 NM per

minute at a 180 kts GS. If you arrive at a checkpoint 10 seconds early, decrease

your airspeed 10 kts for 3.0 minutes. This relationship can be modified to

optimize timely corrections. You may decrease your airspeed 30 kts for 1

minute or 15 kts for 2 minutes. Again, the amount of time you spend making

the correction depends on how quickly you want the correction to occur.

iii.

Ten Percent Method. To use this method you will need to know the amount of

time to gain or lose. This amount is calculated by taking 10 percent of the

flight-planned GS (10% x 180 kts = 18 kts). The rule states that holding the 10

percent increase or decrease in flight-planned GS for 10 minutes gains or loses

LOW-LEVEL NAVIGATION 1-25