 Click here to make tpub.com your Home Page Page Title: Summary of the 60-to-1 Rule and Other Rules & Formulas - Cont'd Back | Up | Next Web www.tpub.com Home

Information Categories
Aerographer
Automotive
Aviation
Construction
Diving
Draftsman
Engineering
Electronics
Food and Cooking
Logistics
Math
Medical
Music
Nuclear Fundamentals
Photography
Religion ·
First, compute our VDP: HAT/300 = 637/300 = 2.1 NM from end of runway
·
The distance from the FAF to the runway is 4.8 NM; FAF to computed VDP is 4.8 - 2.1 =
2.7 NM
·
Use the timing formula:
a)
144 seconds (from timing box) / 4.8 (NM from FAF to MAP) = 30 seconds per mile
b) 30 (seconds per mile) X 2.7 NM = 81 seconds = 1 minute 21 seconds
Or, using another, easier formula:
Timing to MAP (from timing box) ­ 10% of HAT = Time (in seconds) to VDP
Same example: 144 seconds (from timing box) - 10% of 637 = 144 - 63 = 81 seconds = 1
minute 21 seconds
dependent on TAS and AOB. The higher the TAS, the larger the turn radius. As bank angle is
you must keep one of the variables (TAS or bank) constant. Since most procedures are based on a 30°
bank, the following two relationships will provide the distance required to turn an aircraft 90° using
30° of bank. The first relationship is easier to use, but is not as accurate.
TR = NM/MIN ­ 2
or
TR = (NM/MIN)2 / 10
Example: 150 KIAS~160 KTAS~2.67 NM/MIN
2.67 ­ 2 = .67 NM (using first formula)
(2.67) 2 / 10 = .71 NM (using second formula)
The following formula will provide you the TR for a standard rate turn (SRT):
SRT = 0.5% of TAS (or GS)
Example: 0.5% of 160 KTAS = 0.8 NM turn radius
While we are discussing standard rate turns, here are a couple of relationships that will give you the
bank angle to approximate the SRT:
Bank Angle for SRT = (TAS/10) + 7
Example: 160 KTAS; (160/10) + 7 = 23
of bank
Bank Angle for ½ SRT = (TAS/20) + 7
Arcing Lead Points. Now that we know how to determine turn radius, you can use the following 60-