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Final 90 120 140 165 As Specified
Missed Approach (MA) 110 150 240 265 As Specified
Initial 110 140 210 210 As Specified
Intermediate 110 140 180 180 As Specified
Minimum
Airspeed
Restriction*
Missed 100 130 165 185 As Specified
6/3/05 8260.52
Par 1.11.1 Page 1-11
*Minimum speed restriction value for use to reduce turn radius. Only one speed
restriction per approach segment is allowed and the fastest airspeed appropriate for
the highest speed category of aircraft serviced by the approach procedure must be
used to determine the speed. AFS-400 or appropriate military authority approval is
required when more than one speed restriction is desired for a particular approach
segment (e.g. initial, intermediate, missed approach). AFS-400 or appropriate
military authority approval is also required for missed approach airspeed restrictions
when used for other than obstacle/terrain avoidance requirements.
**Publish a chart note indicating the maximum CAT E airspeed.
1.11.2 Calculating Turn Radius For Fly-By Turns.
The turn radius applied at fly-by fixes is based on a standard bank angle of 18° at
a true airspeed plus assumed tailwind. Locate the highest speed aircraft
category that will be published on the approach procedure and use the
appropriate knots indicated airspeed (VKIAS) in table 1-2, using the highest
altitude allowed in the turn, calculate the VKTAS using formula 1-1. Obtain the
highest expected altitude for feeder routes from the appropriate air traffic control
facility. For initial and intermediate segments, use the minimum altitude for the
fix prior to the turn fix. Use the tailwind component from table 1-3 for the highest
altitude within the turn. (For turns initiated at an altitude located between values
in the table, a new tailwind component may be interpolated for that turn. If an
interpolated wind value is ever used below 500 ft, then the 0 ft value for wind
begins with 15 kts.)
8260.52 6/3/05
Page 1-12 Par 1.11.2
Table 1-3. Tailwind Component (VKTW)
For Turn Calculations
Turn Height
Above
Airport
Standard Tailwind
Component (Knots)*
500 25
1,000-2,500 Standard AFS-400
Approval
1,000 37.5 30
1,500 50 35
2,000 50 40
2,500 50 45
3,000 50
3,500 55
4,000 60
4,500 65
5,000 70
5,500 75
6,000 80
6,500 85
7,000 90
7,500 95
8,000 100
8,500 105
9,000 110
9,500 115
10,000 120
10,500 125
≥11,000 130
*Other Tailwind Gradients may be used after a site-specific determination of wind
based on that location’s meteorological history (using available information from
other sources). Document source and value used on procedure form (FAA uses
Form 8260-9).
Determine R using formula 1-2. Select the appropriate tailwind component in
table 1-3 for the highest altitude within the turn and add the value to true
airspeed.
Formula 1-2
( )
KTAS
KTW
2
where V = True Airspeed
V = Tail wind component
R= VKTAS+VKTW ×0.0000449
Example
( )2
Intermediate Segment, altitude=1,500, Cat A-C Mins Published
R= 247.2+50 ×0.0000449=3.966
8260.52 6/3/05
Par 1.11.2a Page 1-13
1.11.2 a. Turn Radii Based On Nonstandard Bank Angles. The standard design
bank angle is 18°. Lower or higher bank angles are allowed for smooth
transitions, maintaining stabilized approaches, lower minima, or achieve specific
leg lengths (see formula 1-3). Nonstandard bank angles must fall in the window
of values listed in table 1-4.
Formula 1-3
( ) ( )
( )
2 1.4589 10 5
tan
VKTAS VKTW
R
φ
+ × × −
=
Where: φ = bank angle
VKTAS = See formula 1-1
VKTW = Tailwind Component from table 1-3
Example
( ) ( )
( )
2 5
RF IF height above airport=5,000, Cat A-D mins Published
bank angle = 8°
2915 70 1 4589 10
13566 NM
8
. .
.
tan
R
+ × × −
= =
These criteria apply to construction at or below FL 190. Where turns above FL
190 are required, use a bank angle of 5°. If 5° results in a DTA value greater
than 20 NM, then ( )
20
tan 0.5 track change in degrees
R =
×
1.11.3 Calculating Bank Angle Associated with a Given RF Leg Flight Track
Radius.
Where RF legs are necessary, the required radius must result in a bank angle
requirement within the window specified in table 1-4
Table 1-4. Bank Angle Window
AGL Height* Bank Angle Window
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