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8260.52 6/3/05
Page 4-2 Par 4.2
Figure 4-1A. Transition from FAS to MAS RNP Levels
The along-track distance (NM) required to complete the splay may be calculated
using formula 4-1.
Formula 4-1
Dsplay=7.464(1−RNPFAS )
Example
( )
MAS
FAS
where RNP = 1.0
RNP = 0.3
Dsplay=7.464 1.0−0.3 = 5.23
Turns are not allowed until the splay is complete. If turns are required before
Dsplay, consider another construction technique; e.g., applying paragraph 4.2.1 or
a conventional TERPS MAS.
4.2.1 RNP Values < 1.
Where turns are necessary, the turn initiation must occur after passing 500 ft
AGL and at least DMASturn feet from DA. When possible, the turn should not occur
until after DER. Calculate DMASturn using formula 4-2.
Formula 4-2
MAStur 16.88 ( 1 (0.00002 ) 10)
KIAS
n KIAS
where V = Indicated airspeed from table 1-2
a = Decision Altitude
D = ×V × + a +
Example
MASturn 16.88 (165 1 (0.00002 650) 10) 2990.21
where VKIAS = 165 Cat D indicated airspeed from table 1-2
a = 650
D = × × + × + =
6/3/05 8260.52
Par 4.2.1 Page 4-3
Where the 40:1 OCS is penetrated and the resulting HAT or visibility can be
reduced by at least 50 ft or ¼ SM respectively, consider limiting the MAS RNP
value until clearing the obstruction. Use the largest RNP value (FAS RNP≤ MAS
RNP ≤ 1.0) that clears the obstruction. The maximum distance (NM) (DMASRNP)
that the < 1.0 RNP value may be extended into the MAS is calculated using
formula 4-3 (see figure 4-1B).
NOTE: Use of MAS RNP values < 1.0 requires track guidance (TF or RF leg
segments). Paragraph 2.8 applies to RNP increases.
Figure 4-1B. RNP Value < 1.0
Formula 4-3
DMASRNP = 20.625×RNPMAS−1.031
Example
( )
where RNPMAS = 0.3
DMASRNP=20.625 0.3 −1.031= 5.16
4.3 MA SEGMENT OCS EVALUATION.
The MAS is composed of OCS sections 1a and 1b (see figure 4-2). Sections 1a
and 1b are separated by the ab line. Section 1a OCS extends from the DA point
downward at the VEB OCS slope ratio for a distance of Dheightloss (calculated
using formula 4-4) measured along the final course track to the ab line. From the
ab line, section 1b OCS rises at a 40:1 slope. Obstacles must not penetrate the
OCS.
Formula 4-4
( )
where HL = Assumed Height Loss
heightloss tan
D HL
θ
=
8260.52 6/3/05
Page 4-4 Par 4.3
Example
( )
where HL = 50
50 95406
3
.
Dheightloss=tan =
Figure 4-2. MAS OEA/OCS
Calculate the MSL height of the missed approach surface (HMAS) at the ab line
(HMASab) using formula 4-5.
Formula 4-5
DA OCSorigin ( )
ab elev
OCSslope
D D HL
HMAS LTP
VEB
tan θ
− −
= +
DA
OCSorigin
OCSslope
where D = Distance from LTP to DA
D = Distance from LTP to OCS origin
VEB = Final segment OCS slope
HL = Height loss
Example
( )
HMASab
. .
tan
.
.
− −
= + =
DA
OCSorigin
OCSslope
where D = 4770.28
D = 2585.64
VEB = 20.72
HL = 50
473212 258564 50
3
400 45755
2072
6/3/05 8260.52
Par 4.3 Page 4-5
The MSL height of the section 1b surface (Hsection1b) at any obstruction can be
calculated using formula 4-6 after determining distance (Dsection1b) by measuring
the along-track centerline distance from the ab line to a point abeam the
obstruction.
Formula 4-6
section1b
section1b
ab MA OCSslope
H =HMAS + D
Example
section1b
ab
section1b
where HMAS = 457.55
D = 13548
45755 13548 79625
40
H = . + = .
4.3.1 OCS Penetrations.
Where obstructions penetrate the OCS, take one or more of the following actions
to achieve the lowest possible DA:
􀂃 Remove or lower the obstruction.
􀂃 Use RNP level < 1.0 to place obstacle outside the OEA.
􀂃 Alter MA track.
􀂃 Adjust DA.
􀂃 Require MA climb gradient.
4.3.1 a. DA Adjustment. See figure 4-3. To determine the DA required to mitigate a
MA OCS penetration, determine the amount of increase required in the HAT
value using formula 4-7.
Figure 4-3. DA Adjustment
8260.52 6/3/05
Page 4-6 Par 4.3.1a
Formula 4-7
( ) Slope Slope
Slope Slope
where p = amount of penetration (ft)
= glidepath angle
　
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