Chapter 6
pavement flexing and structural damage of aircraft and should be avoided.
6.17.2. Rotary-Wing Aircraft. Grading standards for rotary-wing parking aprons are presented in
Table 6.2 for Army facilities and AFH 32-1084, Standard Facility Requirements Handbook for Air
Force facilities.
6.17.3. Grades for Aircraft Fueling Ramps. Grades for ramps on which fueling of aircraft will occur
should be in accordance with National Fire Protection Association (NFPA) Standard 415, Aircraft
Fueling Ramp Drainage.
6.18. Shoulders. Paved shoulders are provided around the perimeter of an apron to protect against jet
blast and FOD, to support blast deflectors, for support equipment storage, and to facilitate drainage.
Criteria for apron shoulders are presented in Table 6.1 for fixed-wing aprons, Table 6.2 for Army rotary-
wing aprons, and AFH 32-1084 for Air Force rotary-wing facilities. To prevent storm water from
ponding on the outside edge of the shoulder, the turf adjacent to the paved shoulder should be graded to
facilitate drainage.
6.19. Miscellaneous Apron Design Considerations. In addition to the apron design criteria,
consideration should be given to providing room for support structures, equipment, and facilities.
6.19.1. Jet Blast Deflectors. Jet blast deflectors will substantially reduce the damaging effects of jet
blast on structures, equipment, and personnel, as well as the related noise and fumes associated with
jet engine operation. Additional information on jet blast deflectors is found in Attachment 9.
6.19.2. Line Vehicle Parking. Line vehicle parking areas are provided for parking of mobile
station-assigned and squadron-assigned vehicles and equipment. Additional information on line
vehicle parking is found in Attachment 13.
6.19.3. Utilities. The following items are normally found on parking aprons. These items are not a
part of airfield geometric design. However, the designer needs to be aware that they are an integral
part of a parking apron and should make provisions for them accordingly.
6.19.3.1. Storm water runoff collection system including inlets, trench drains, manholes, and
pipe.
6.19.3.2. De-icing facilities and de-icing runoff collection facilities.
6.19.3.3. Apron illumination.
6.19.3.4. Fire hydrants.
6.19.3.5. Refueling facilities.
6.19.3.6. Apron edge lighting.
6.20. CV-22 Apron Clearances. Figure 6.38 provides parking block dimensions as well as peripheral
and interior taxilane clearance requirements.
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