Section 3. Low/Medium Frequency and VOR Airways
20-3-1. REQUEST FOR FLIGHT
INSPECTION DATA
a. VOR Federal
airways are based on NAVAIDs which normally are spaced no farther apart than
80 NM. They may be based on more widely spaced NAVAIDs if a usable signal can be
provided and frequency protection afforded for the distance required (see Order
9840.1, U.S. National Aviation Handbook for the VOR/DME/TACAN Systems).
b. NAVAID
spacing for L/MF airways has no standard but is determined on an individual
basis.
20-3-2. FLIGHT INSPECTION DATA
DISTRIBUTION
The standard vertical and
lateral extent of these airways is specified in FAAO 8260.3, TERPS, and FAAO
8260.19, Flight Procedure and Airspace. Nonstandard dimensions may be specified
as required except as limited by any flight inspection limitations and by
paragraph 20-1-7 of this order.
20-3-3. FLIGHT INSPECTION REQUESTS
a. Width
reductions are not applicable to L/MF airways.
b. For ATS
routes other than L/MF, a reduced airway width of 3 NM on one or both sides of
the centerline may be established from the NAVAID to the point where 4.5 degree
intersecting lines equal 3 NM. Normally, lines perpendicular to the airway
centerline determine the ends of the reduced portion. If required, the ends of
the reduced portion may be defined differently. A reduced width is permissible
to obtain additional traffic capacity and flexibility through the use of
multiple routes and to avoid encroachment on special use airspace or other
essential maneuvering areas. Width reductions are considered the exception
rather than the rule and are approved only where adequate air navigation
guidance and justification exist.
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