Chapter 6
6.11.5.2. Navy and Marine Corps. Navy and Marine Corps compass calibration pad size is
provided in MIL-HDBK-1021/1.
6.11.6. Access Taxiway/Towway. An access taxiway will be provided for access from the primary
taxiway to the compass calibration pad. The access taxiway must be oriented to facilitate moving the
aircraft onto the compass calibration pad on a magnetic north heading. At Army and Air Force
aviation facilities, if the aircraft should be towed to the compass calibration pad, the access taxiway
must be designed as a towway. At Navy and Marine Corps facilities, the taxiway should be
designed as a taxiway. Taxiway and towway design requirements are presented in Chapter 5.
6.11.7. Grading. Compass calibration pads will be graded as follows:
6.11.7.1. Perimeter Elevation. The elevation of the perimeter of the pad will be the same
elevation around the entire perimeter.
6.11.7.2. Cross-slope:
6.11.7.2.1. Army and Air Force. The compass calibration pad should be crowned in the
center of the pad with a constant cross slope of 1 percent in all directions to provide surface
drainage while facilitating alignment of the aircraft pad.
6.11.7.2.2. Navy and Marine Corps. Grading criteria for compass calibration pads is found
in MIL-HDBK-1021/1.
6.11.8. Tiedowns/Mooring Points. No aircraft tiedown/mooring points/tiedown mooring eyes, or
any static grounding points must be placed in the compass calibration pad pavement.
6.11.9. Embedded Material. Due to the influence of ferrous metal on a magnetic field, the PCC
pavement for the compass calibration pad and access taxiway must not contain any embedded
ferrous metal items such as dowels bars, reinforcing steel, steel fibers, or other items. In addition,
ferrous metal must not be placed in or around the compass calibration pad site.
6.11.10. Control Points. A control point will be set in the center of the compass calibration pad.
This point will consist of a brass pavement insert into which a bronze marker is grouted in accurate
alignment. This point will be stamped with "Center of Calibration Pad." The layout of the control
points is further discussed in Attachment 11.
6.12. Hazardous Cargo Pads. Hazardous cargo pads are paved areas for loading and unloading
explosives and other hazardous cargo from aircraft. Hazardous cargo pads are required at facilities
where the existing aprons cannot be used for loading and unloading hazardous cargo.
6.12.1. Navy and Marine Corps Requirements. Hazardous cargo pads are not normally required at
Navy and Marine Corps facilities. However, where operations warrant or there is an Air Force
hazardous cargo aircraft continuously present, they can be justified with proper documentation.
6.12.2. Siting Criteria. Hazardous cargo pads require explosives site planning as discussed in
Attachment 10.
6.12.3. Hazardous Cargo Pad Size:
6.12.3.1. Circular Pad. At aviation facilities used by small cargo aircraft, the hazardous cargo
pad is a circular pad as shown in Figure 6.25.
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