Table 4.1. Rotary-Wing Runways.
Maximum longitudinal grade change is 0.167% per 30 linear
meters [100 linear feet] of runway. Exceptions: 0.4% per 30
linear meters (100 linear feet) for edge of runways at runway
From centerline of runway.
Runway may be crowned or uncrowned.
See Table 4.4.
half the width
Measured perpendicularly from centerline of runway. This
area is to be clear of fixed and mobile obstacles. In addition
to the lateral clearance criterion, the vertical height
restriction on structures and parked aircraft as a result of the
transitional slope must be taken into account.
(1) Fixed obstacles include manmade or natural features
constituting possible hazards to moving aircraft.
Navigational aids and meteorological equipment are possible
exceptions. For Army and Air Force, siting exceptions for
navigational aids and meteorological facilities are found in
Attachment 14 of this manual. For Navy and Marine Corps,
siting exceptions for navigational aids and meteorological
facilities are found in NAVFAC P-80.3.
(2) Mobile obstacles include parked aircraft, parked and
moving vehicles, railroad cars and similar equipment.
(3) Taxiing aircraft are exempt from this restriction.
However, parallel taxiways (exclusive of shoulder width)
must be located in excess of the lateral clearance distance.
Exclusive of pavement and shoulders. For Air Force
installations, a minimum of 2.0 percent before