Table 6.5. Hangar Access Apron.
Max 10.0% (See note 2.)
If the wingtip clearance line falls within
the Access Apron Shoulder, no grading
is required beyond the Access Apron
1. NA = not applicable
2. Bed of channel may be flat.
3. Metric units apply to new airfield construction and where practical modification to existing airfields and
heliports, as discussed in paragraph 1.4.4.
4. The criteria in this manual are based on aircraft specific requirements and are not direct conversions from
inch-pound (English) dimensions. Inch-pound units are included only as a reference to the previous standard.
5. Airfield and heliport imaginary surfaces and safe wingtip clearance dimensions are shown as a direct
conversion from inch-pound to SI units.
6.15.2. Grades for Aircraft Fueling Ramps. Grades for hangar access ramps on which fueling of
aircraft will occur must slope away from aircraft hangars in accordance with National Fire
Protection Association (NFPA) Standard 415, Aircraft Fueling Ramp Drainage.
6.15.3. Grades for Aircraft Access into Hangars. The grades in front of the hangar must allow
access into the hangar. When aircraft are backed into the hangar, a tug vehicle pushes the aircraft in,
tail first. Due to the location of the aircraft gear and the slope of the hangar access apron, the tail of
the aircraft may be higher than the top of the hangar door. The hangar access apron grades may
require adjustment to allow the aircraft tail to clear the hangar door.
6.16. Taxiing Characteristics on Aprons for Rotary-Wing Aircraft:
6.16.1. Hoverlane/Taxilane. Taxi routes across parking aprons are marked to provide safe passage
of the aircraft across the apron. A hoverlane is a designated aerial traffic lane used exclusively for
the movement of helicopters. A taxilane is a designated ground traffic lane.
22.214.171.124. Army Facilities. At Army Facilities, the hoverlane/taxilane widths are fixed distances,
based on type of aircraft, as noted in Table 6.2.
126.96.36.199. Air Force Facilities. At Air Force Facilities, the hoverlane/taxilane width is based on
the rotor diameter of the largest helicopter generally using the apron.
6.17. Fixed-Wing and Rotary-Wing Grading Standards:
6.17.1. Fixed-Wing Aircraft. Grading standards for fixed-wing parking aprons and shoulders are
presented in Table 6.1. All parking aprons, pads and miscellaneous pavements should follow these
grading standards unless a particular mission requirement, such as a power check pad, dictates
otherwise. Surface drainage patterns with numerous or abrupt grade changes can produce excessive