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decelerates from the en route environment or a terminal transition route through
the initial/intermediate approach segments to the precision final approach fix
(PFAF). The aircraft arrives at the DA and continues with visual reference to a
landing on the runway or initiates a missed approach. The design of the
instrument procedure defines the boundaries of the airspace within which the
instrument operation will be conducted. This is the airspace that will “contain”
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Par 1.7 Page 1-9
(account for) all of the major factors influencing GPN: System accuracy, flight
technical error, navigation system error, and error values that provide an
acceptable level of continuity, availability, and integrity. For obstacle clearance
purposes, the boundaries are specified as a nautical mile measurement
perpendicular to the designed flight path. This measurement is specified as an
RNP value or level. The primary OEA of RNP instrument procedures is defined
as ± 2×RNP. Table 1-1 lists RNP values applicable to specific instrument
procedure segments.
Table 1-1. RNP Values
RNP VALUES
SEGMENT
MAXIMUM STANDARD MINIMUM
Feeder 2 2 1.0
Initial 1 1 0.1
Intermediate 1 1 0.1
Final 0.5 0.3 0.1
Missed
Approach 1 1 0.1*
*See paragraph 4.2.1 for limitations of missed approach segment
minimum values.
1.8 APPLICABILITY.
Approach procedures developed under these criteria are published under the
authority of 14 CFR Part 97.33 and identified as “Special Aircraft and Aircrew
Authorization Required.” General criteria contained in the latest editions of
Order 8260.3, United States Standard for Terminal Instrument Procedures
(TERPS), and RNAV and RNP specific criteria contained in Order 8260.19, Flight
Procedures and Airspace, apply unless modified by these criteria.
1.9 PROCEDURE IDENTIFICATION.
Title RNP procedures “RNAV (RNP) RWY XX.” Where more than one RNAV
approach with different ground-tracks are developed to the same runway, identify
each with an alphabetical suffix beginning at the end of the alphabet. Title the
procedure with the lowest minimums with the “Z” suffix, etc.
Examples
RNAV (RNP) Z RWY 13L (lowest HAT: example 250 ft)
RNAV (RNP) Y RWY 13L (2nd lowest HAT: example 300 ft)
RNAV (RNP) X RWY 13L (3rd lowest HAT: example 350 ft)
1.10 PUBLISHED MINIMUMS.
RNP approach procedures are 3-dimensional approaches, lateral and vertical
path deviation guidance is provided. Circling minimums are not developed.
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Page 1-10 Par 1.10
Evaluate the final segment for an RNP value of 0.3 and a standard RNP 1.0
missed approach, and publish the resulting minimums. If the resulting HAT value
is ≥ 300 or no-lights visibility ≥ 1 SM, evaluate using a FAS RNP value <0.3 but
≥ 0.10 and/or a missed approach climb gradient or reduced MAS RNP, as
appropriate, to determine lowest possible HAT/no-lights visibility. If at least a
50 ft reduction in HAT or ¼ SM reduction in visibility cannot be achieved, publish
only the RNP 0.3 minimums, based on RNP 1 missed approach (standard
missed approach). If the required reduction in minimums is possible, in addition
to the RNP 0.3 minimums based on a standard missed approach, publish the
lowest possible minimums. If the difference in minimums allows interim values
that differ by at least 50 ft in HAT value or ¼ SM visibility, these values may also
be published if desired (4 minima lines maximum). Note that RNP values lower
than 0.3 may be selected to satisfy operational needs other than reduction of
minimums; examples are: to achieve track to airspace separation, track to track
separation, or to allow the DA to meet criteria of distance from the FROP.
1.10.1 Minimum Safe Altitudes (MAS).
Apply the MSA criteria contained in Order 8260.3, Volume 1, paragraph 221 for
RNAV procedures.
1.11 CALCULATING TRUE AIRSPEED, TURN RADIUS, AND BANK ANGLE.
1.11.1 Calculating True Airspeed.
Determine the true airspeed (KTAS) for the turn using formula 1-1 and the
airspeed for the highest category minimums published from table 1-2.
Formula 1-1
( )
Where VKIAS = Indicated Airspeed
altitude = Maximum segment altitude in thousands of feet
VKTAS=VKIAS×1+ altitude×0.00002
Example
( )
Final Segment, CAT B, 1,500 feet
VKTAS=120×1+ 1,500×0.00002=123.6
Table 1-2. Indicated Airspeed (Knots)
Indicated Airspeed by Aircraft Category
Segment
Cat A Cat B Cat C Cat D Cat E**
Initial
Intermediate 150 150 240 250 250
　
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