Chapter 6
grounding points will be provided at each aircraft parking location, as discussed in Attachment 12.
6.14. Aircraft Wash Racks. Aircraft wash racks are paved areas provided at all facilities to clean
aircraft in conjunction with periodic maintenance and to prevent corrosion.
6.14.1. Location. Covered and uncovered aircraft wash racks should be located adjacent to the
hangar area or maintenance facilities and contiguous to aircraft parking or access aprons. Existing
pavements can be used where curbing can be installed, drainage adjusted as necessary, and other
required facilities such as utilities, can be provided to make a usable wash rack. Where possible,
wash racks should be located near existing facilities where existing utility and pollution control
systems are accessible. In siting wash racks, support facilities such as pump houses and tanks
should be located either outside apron clearance distances or below grade.
6.14.2. Wash Rack Size. The size and configuration of an aircraft wash rack is determined by the
type of mission aircraft expected to use it. The dimensions of the largest aircraft plus the clearances
shown in Table 6.4 determine the minimum wash rack pavement dimensions. At mixed mission
facilities, it may be possible to accommodate several smaller (fighter) aircraft on one larger aircraft
wash rack pavement.
Table 6.4. Wash Rack Clearances From Aircraft to Curb.
Distance
Distance
Aircraft
From
To
Direction
(Meters)
(Feet)
Heavy Bomber, Medium
Wingtip
Curb
Horizontally
4.6
15
Bomber, and Cargo
Tail
Curb
Horizontally
4.6
15
Nose
Curb
Horizontally
4.6
15
Fighter
Wingtip
Curb
Horizontally
3.1
10
Tail
Curb
Horizontally
3.1
10
Nose
Curb
Horizontally
3.1
10
Helicopter
Rotor-tip
Curb
Horizontally
See note 1.
See note 1.
Tail
Curb
Horizontally
See note 2.
See note 2.
Nose
Curb
Horizontally
See note 3.
See note 3.
Notes:
1. For light to medium helicopter (UH-60 baseline), width of wash rack is based on the addition of 3.1 m
[10-feet] buffers to the rotor diameter. For heavy helicopter (CH-47 Baseline), width of wash rack is
based on the addition of 3.1 m [10-feet] buffers to the rotor diameter. For wash racks servicing
multiple aircraft a 6.1 m (20-feet) buffer is required between rotor-tips.
2.
3.1 m [10-feet] for light and medium helicopter (UH-60 baseline).
10.4 m [34-feet] for heavy
helicopter (CH-47 baseline).
3.
6.7 m [22-feet] for light and medium helicopter (UH-60 baseline).
10.4 m [34-feet] for heavy
helicopter (CH-47 baseline).
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