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with the FAA regional FPO); or
• An AAO of 199 feet above the next higher gradient line minus one unit of
elevation, unless it penetrates the Part 77 surfaces for which a Part 77
survey has been performed.
6/3/05 8260.52
Par 1.15.2 Page 1-17 (and 1-18)
1.15.2 Application of Vertical and Horizontal Accuracy Uncertainty.
Apply the obstruction vertical and horizontal accuracy code values to all
obstructions. From a 3-dimensional perspective, a point described by latitude,
longitude, and elevation can be evaluated as a cylinder when applying both
vertical and horizontal accuracy (see figure 1-11).
Figure 1-11. Application of Horizontal
and Vertical Accuracy
1.16 INFORMATION UPDATE.
For your convenience, FAA Form 1320-19, Directive Feedback Information, is
included at the end of this order to note any deficiencies found, clarifications
needed, or suggested improvements regarding the contents of this order. When
forwarding your comments to the originating office for consideration, please use
the "Other Comments" block to provide a complete explanation of why the
suggested change is necessary.
6/3/05 8260.52
Par 2.0 Page 2-1
CHAPTER 2. FEEDER, INITIAL, AND INTERMEDIATE SEGMENTS
2.0 GENERAL.
Feeder, initial, and intermediate segments provide a smooth transition from the
en route environment to the final approach segment. Descent to glidepath
intercept and configuring the aircraft for final approach must be accomplished in
these segments. Design RNP segments using the most appropriate leg type (TF
or RF) to satisfy obstruction and operational requirements in feeder, initial,
intermediate, final, and missed approach segments. Generally, TF legs are
considered first but RF legs may be used in lieu of TF-TF turns for turn path
control, procedure simplification, or improved flyability.
2.1 CONFIGURATION.
RNP navigation enables the geometry of approach procedure design to be very
flexible. The “Y” configuration is preferred where obstructions and air traffic flow
allow. The approach design should provide the least complex configuration
possible to achieve the desired minimums. See figure 2-1 for examples. Fly-by
turns at the PFAF are limited to a maximum of 15°.
Figure 2-1. Optimum Configuration
2.2 RNP SEGMENT WIDTH.
RNP values are specified in increments of a hundredth (0.01) of a NM. Segment
width is defined as 4×RNP; segment half-width (semi-width) is defined as 2×RNP
8260.52 6/3/05
Page 2-2 Par 2.2
(see figure 2-2). Standard RNP values for instrument procedures are listed in
table 1-1.
Figure 2-2. RNP Segment Width
Apply the standard RNP values listed in table 2-1 unless a lower value is
required to achieve the required ground track or lowest minimums. The lowest
RNP values are listed in the “MINIMUM” column of table 2-1.
2.3 RNP SEGMENT LENGTH.
Design segments with sufficient length to accommodate the required descent as
close to the OPTIMUM gradient as possible and DTA (see paragraph 1.13)
where turns are required. Minimum straight segment (any segment) length is
2×RNP (+DTA as appropriate for fly-by turn constructions). Paragraph 2.8
applies where RNP changes occur (RNP value changes 1 RNP prior to fix). The
maximum initial segment length (total of all sub segments) is 50 NM.
2.4 RNP SEGMENT DESCENT GRADIENT.
Design instrument approach procedure segments to provide descent at the
standard gradient. Where necessary to achieve obstacle clearance, descent
gradient may be increased. Table 2-1 lists the standard and maximum allowable
descent gradients.
6/3/05 8260.52
Par 2.4 Page 2-3
Table 2-1. Descent Gradient Constraints
DESCENT GRADIENT
SEGMENT (FT/NM)
STANDARD MAXIMUM
Feeder 250 500
Initial 250
**800
500
**1000
Intermediate ≤ 150
Equal to Final
Segment Gradient*
Final 318 See Table 3-1
* If a higher than standard gradient is required, a prior segment must
provide a gradient to allow the aircraft to configure for final segment
descent.
** DoD Only
2.4.1 Descent Gradient Calculation.
2.4.1 a. TF Segments.
See figure 2-3, and calculate the descent gradient using formula 2-1.
Figure 2-3. TF Segment Descent Gradient (DG)
Formula 2-1
where a=minimum altitude at beginning fix
b=minimum altitude at ending fix
d=distance (NM) between fixes
DG a b
d
−
=
Example
Example: a=4,500 b=3,600 d=5.77
4 500 3 600 15598
577
, , .
.
DG
−
= =
8260.52 6/3/05
Page 2-4 Par 2.4.2
　
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