SECTION 1. GENERAL CRITERIA
4. GENERAL.
a.
Positive Course Guidance. All RNAV segments are assumed to have positive course guidance. Criteria for “climb to an altitude and turn” is not provided due to the inability to specify a positive course with an altitude.
b.
Waypoint Substitution. Existing fixes/navigational aids (NAVAIDS) may be substituted for a WP where conveniently located. For purposes of simplicity in this criteria, the term WP will be usedto denote a fix.
c.
Waypoint Displacement Area. Terminal RNAV fix displacement tolerance applies where the plotted position of the WP is at, or within, 30 nautical miles (NM) straight line measurement of the departure airport's reference point (ARP). En route fix displacement applies beyond 30 NM from the ARP. See table 1.
TABLE 1
FIX DISPLACEMENT TOLERANCE
EN ROUTE TERMINAL
XTRK 2.8 1.5
ATRK 2.0 1.0
d.
Waypoints. Provide “fly-by waypoints” whenever possible. Specify “fly-over waypoints” only to achieve an operational advantage or benefit. Document the fix use and status of a waypoint as “fly-by” or “fly-over” in the REMARKS block of FAA Form 8260-2, Radio Fix and Holding Data Record. Establish WP’s at route course changes and at other points of operational benefit.
e. Charting Instructions. All RNAV departures shall be charted graphically.
f.
Waypoint Definition. For departure WP’s located on runway centerline extended, establish coordinates using the reciprocal of the opposite direction runway true bearing and the appropriate distance applied from the DER. Where two or more segments are aligned along a continuous geodesic line, align and construct all succeeding WP’s based on a true bearing and distance from the first (reference) WP in the sequence. Where turns are established, use the TWP as the reference WP to construct succeeding WP’s and segments aligned on a continuous geodesic line following the turn.
g.
Course Change at Waypoints. The departure course at a WP is the bearing from that WP to the following WP. The arrival course at the WP is the reciprocal of the course from that WP to the preceding WP. The difference between the departure course and the arrival course at a WP equals the amount of turn at that WP. Maximum course change allowable is 120°.
5.
IDENTIFICATION OF RNAV INSTRUMENT DEPARTURE PROCEDURES. Identify the procedure as “RNAV DEPARTURE” followed by the takeoff runway number; e.g., RNAV DEPARTURE RWY 27. Multiple departure procedures from the same runway must identify a geographical route or use a transitional route name; e.g., BRAXTON FOUR RNAV DEPARTURE, or RNAV DEPARTURE, RWY 27, LEMHI TRANSITION.
6.
ROUTE DESCRIPTION. Specify the magnetic courses and include the names of all WP’s in the order flown with any altitude restriction crossing requirements specified at the WP’s or alongtrack distance (ATD) fixes. Preface the route description with “RNP-1.0 or GPS required. Select 1 NM receiver sensitivity, if available.”
7.
APPLICATION
a. Apply diverse departure criteria contained in Order 8260.3B, chapter 12, to determine if RNAV departure routes are required.
b. Aircraft Departure Speed Turning Radii. See table 2.
(1)When the first TWP is within 6 NM of DER, use a turn radius of 2 NM for that area; for any TWP thereafter apply paragraphs 7b(2) or (3) as appropriate.
(2) For all turns below 10,000 feet mean sea level (MSL),
use 250 knots indicated airspeed (KIAS) unless a speed restriction of 180 KIAS is noted on the procedure for that turn.
(3)
For turns at 10,000 feet MSL and above, use 310 KIAS unless a speed restriction of 180 or 250 KIAS is noted on the procedure for that turn.
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