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 MIL-HDBK-1021/1
TABLE 15
Aircraft Compass Calibration Pad Design Criteria
____________________________________________________________________________
Item
Criteria
____________________________________________________________________________
Location:
Accessibility
Must be accessible, free of nearby traffic, and
have sufficient space for the largest aircraft
using the facility to be moved in headed toward
magnetic north.
Magnetic
For maximum accuracy, earth's magnetic field in
influences
the area should be uniform in both magnitude
and direction. Tolerances prescribed are
required to ensure a swing accuracy of 0.2
degree.
Lateral clearances
Maintain following minimum clearances from
center of pad:
To nearest portion of building
containing any magnetic material
such as steel and iron
600 ft.
To nearest edge of railroad tracks
600 ft.
To dc power line and/or equipment
1000 ft.
To edge of aircraft and vehicle
parking areas
275 ft.
To ac power line and/or equipment
600 ft.
To underground electric power line
500 ft.
To overhead steam lines
600 ft.
To underground metal conduits
and piping
225 ft.
To centerline of nearest primary
taxiway or towway
275 ft.
Pavement:
Type
Portland cement concrete without reinforcement.
Load-bearing
See MIL-HDBK-1021/2.
capacity
Special construc-
All construction materials shall be free of
tion requirements
ferrous and other magnetic substances.
Shoulders:
Slope treatment
Provide 50-foot wide shoulders with transverse
grade maximum 4.0% and minimum 2.0%. Pave the
inner 10-foot shoulders in same manner as first
10 feet of runway shoulders from runway edge.
Size
See Figure 27.
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