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VEB
amount of penetration (ft)
OCS = Slope of VEB OCS
Example
( ) ( ) ( )
VEB
where = 3°
d = 4315
p = 8'
OCS
3 4315 8 2071 52 400 405 28182
HATadjusted tan . .
θ
= ⋅ + ⋅ + + − =
elev
= 20.71
LTP = 400
TDZE = 405
8260.52 6/3/05
Page 3-14 Par 3.5.2
3.5.2 Applying VEB OCS to RF Final Segments.
Where RF legs are incorporated in the final segment, the OCS slope ratio will be
consistent for the straight and curved path portions; however, the OCS origin will
be different because the variables for aircraft body geometry is different for
straight and curved path legs. The OCS elevation at any point is equal to the
surface elevation of the course centerline abeam it (see figure 3-6).
Figure 3-6. RF Final Segment OCS Evaluation
Glidepath
TF OCS TF OCS
RF OCS
TF OCS
origin
RF OCS
origin
RF
FROP
RF
Segment
Initial Fix
1 RNP
3.6 VISUAL SEGMENT EVALUATION.
Apply Order 8260.3, United States Standard for Terminal Instrument Procedures
(TERPS), Volume 1, paragraph 251. In addition, apply an obstacle identification
surface (OIS) that originates at the LTP and extends to the DA
point at an angle of one degree less than the glidepath angle (see figure 3-7).
Figure 3-7. VEB Visual Segment OIS
The OIS half-width at the LTP is 100 ft outside the runway edge. It splays at an
angle of 10° relative to course until reaching a width of ± 1RNP, which it
maintains until contacting the final segment OEA at DA (see figure 3-8).
6/3/05 8260.52
Par 3.6 Page 3-15
Formula 3-20
( )
( )
1 607611548 100
2
10
.
length tan
RNP Rwy Width
Splay
⋅ ⋅ − +
=
Example
( )
( )
1 015 607611548 100 150
2 4176 43
10
where RNP = 0.15
Rwy Width = 150
. .
.
Splaylength tan
× ⋅ − +
= =
Figure 3-8. Visual Segment OIS at Full Width
Calculate the segment length (Splaylength) required to reach ±1RNP using
formula 3-20. If Splaylength is greater than the distance from LTP to DA, construct
a ±1 RNP buffer area aligned with the runway centerline extended from the DA
point toward the LTP for a distance of “Dbuffer” as shown in formula 3-21 and
figure 3-9 based on largest category minima published and the PFAF altitude.
The buffer OIS is a continuation of the VEB OCS from DA to the OCS origin, or
Dbuffer, whichever is less. An obstacle may penetrate the visual/buffer OIS
(figures 3-8 and 3-9) provided it is charted and appropriate mitigations are
identified and approved by AFS-400.
8260.52 6/3/05
Page 3-16 Par 3.6
Formula 3-21
Dbuffer=(VKTAS+10)⋅8.44
Example
Dbuffer=(171.93+10)×8.44=1535.49
Figure 3-9. Visual Segment Not at Full Width
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Par 4.0 Page 4-1
CHAPTER 4. MISSED APPROACH SEGMENT (MAS)
4.0 GENERAL.
These criteria are based on the following assumptions:
• Aircraft climb at a rate of at least 200 ft/NM (3.29%) in the missed
approach segment.
• A non-guided missed approach is not RNP and is treated as deadreckoning
navigation (subject to 15° OEA splay).
• The OEA expansion where FAS RNP levels less than RNP-1 are
continued into the MAS is based on IRU drift rates of 8 NM per hour.
• For RNP levels less than 1, turns are not allowed below 500 ft measured
AGL
• A 50-ft height loss is inherent in MA initiation.
The standard MA construction is a continuation of the final approach course. The
OEA expands at a 15° splay from the FAS RNP value to a value of 1.0, using a
40:1 OCS slope ratio. Missed approach RF turns that are speed limited must
limit bank angles to 15° maximum. If necessary, RNP may be discontinued at
the MAP or any subsequent fix and a conventional MAS constructed under
Order 8260.3, Volume 1, chapter 2.
4.1 MAS SEGMENT LEG TYPES.
The missed approach route is a series of segments. The following leg types are
authorized for missed approach procedure design:
• Track-to-Fix TF
• Radius-to-Fix RF
Additionally, if the RF leg RNP value is<1.0, the RF leg length must comply with
paragraph 4.2.1.
4.2 MA SEGMENT RNP LEVEL.
The standard MA segment splays from the FAS width at DA, 15° relative to
course centerline, to a width of ± 2 NM (RNP 1.0). See figure 4-1A.
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