Helpful Math Tips

Question 0

Decent Planning

Answer 0

FL340-FL200

Will assume for the example of the groundspeed is 520 kts.
• Altitude to lose x3 = distance needed to descend
• Groundspeed/2 = rate of descent

EXAMPLE:
FL 340-FL 200 = 14,000×3 = 42 miles to desend

520/2 = 260(0) or 2600 ft/min descent rate needed

Question 1

BINGO fuel

Answer 1

• Write down your RESV (Reserve) fuel.
• Write down your ALT (alternate) fuel. If you weren’t given an alternate, then figure out with dispatch what your alternate will be and write down that fuel.
• Figure out the straight-line distance from your HOLD to your DEST.
• Approximately 1000 lbs fuel/100 mi.
• Add 500 lbs buffer for displayed radar vectors and approach.

EXAMPLE:

2.327 RESV
2.500 ALT
0.600 BURN (will assume for this example it is 60 miles from HOLD to DEST). (60/100 = .6×1000 = 600 lbs of fuel)
0.500 BUFFER
=5927 BINGO

You need to leave the hold for either your destination or alternate when you reach 5927 lbs of fuel.