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INSTRUMENT FLIGHT RULES WORKBOOK
CHAPTER FIVE
504. SOLUTION OF TIME IN MINUTES AND SECONDS
The smaller index mark at 36 (on the inner scale) is called the seconds index due to the fact that
one hour is equivalent to 3,600 seconds. When this index is placed opposite a speed on the outer
scale, a distance read on the outer scale will relate to a corresponding time in seconds on the
inner scale. For example, if the seconds index (36) is placed under a ground speed of 144 knots,
50 seconds are required to go 2.0 NM, and in 150 seconds 6.0 NM will be traveled.
505. FUEL CONSUMPTION PROBLEMS
Problems dealing with fuel consumption are worked in the same manner as time-distance
problems. However, while time is still on the inner scale, fuel (consumed and consumption rate)
is on the outer scale.
EXAMPLE
Given:  Fuel consumption . . . . . . . . . . . . . . . . . .11 gal. per hour
Time flown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 + 30
Find:
Fuel consumed
PROCEDURES
LQGH[ 
a.
Set fuel consumption over
b.
Read fuel consumed over time.
Answer: Fuel consumed = 49.5 gallons rounded up to 50 gallons.
PRACTICE
RATE PER HOUR
TIME
QUANTITY
1.
38 gal.
1 + 30
_________ gal.
2.
115 lbs.
+ 50
_________ lbs.
3.
_________
3 + 45
432 gal.
4.
245 lbs.
_________
1, 225 lbs.
5.
750 lbs.
11 + 00
_________ lbs.