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 MIL-HDBK-1021/1
TABLE 2 (Continued)
Runway Pavement Criteria
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Item
Criteria
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Class B Runway
1000 feet.
Measured perpendicularly from centerline of
runway. This distance is to be clear of
fixed and mobile obstacles. Where the
lateral clearance distance has been
established according to the previous 750
foot criteria the 750 foot distance may
remain. See NAVFAC P-80.3. For new runway
construction at existing air installations
NAVFAC Headquarters should be consulted for
criteria.
Runway lateral clearance
In addition to the lateral clearance
distance (Primary surface)
criteria, the vertical height restriction
(Continued)
on structures and parked aircraft as a
result of the 7:1 transitional slope must
be taken into account.
(1) Fixed obstacles include manmade or natural
features such as buildings, trees, rocks,
terrain irregularities and any other
features constituting possible hazards to
moving aircraft. Siting exceptions for
frangibly mounted air navigational aids
and meteorological facilities are in
NAVFAC P-80.
(2) Mobile obstacles include parked aircraft,
parked and moving vehicles, railroad cars,
and similar equipment. Taxiing aircraft
and emergency vehicles are exempt from
this restriction.
(3) Parallel taxiways for Navy and Marine
Corps airfields may be located within
the lateral clearance distance at least
500 feet from centerline of runway to
centerline of taxiway.
(4) Aboveground drainage structures are not
allowed but may be individually
reviewed. Drainage slopes of up to a
10:1 ratio are permitted for all runway
classes, but swales with more gentle
slopes are preferred.
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