KKK-A-1822 E
3.4.10 FORDING.
The vehicle shall be capable of three fordings, without water entering patient and equipment
compartments while being driven through a minimum of 20 cm (8 in.) of water, at speeds of
8 km/hr (5 mph), for a distance of at least 30.5 m (100 feet). Test under 4.4.4.
3.4.11 VEHICLE PHYSICAL DIMENSIONAL REQUIREMENTS.
3.4.11.1 LENGTH.
Overall length of the ambulance shall not exceed 671 cm (22 ft), including bumpers, but
excluding rear step and bumper guards. Purchaser may specify (see 6.2-f) additional length
if necessary to accommodate special equipment or larger bodies and crew cabs but should
consult with the manufacturer to determine that other safety, handling, and functional
characteristics are not compromised.
3.4.11.2 WIDTH.
Unless otherwise specified (see 6.2-g), the overall (OA) width of ambulance bodies having
single rear wheels shall be between 200 and 213 cm (79 and 84 in.), excluding mirrors and
lights. The ambulance body sides, on a chassis with dual rear wheels, shall be within+/- 6.35
cm (+/- 2.5 in.) of the overall width of the tires (outside sidewalls) (see 3.5.6, 3.6.5.6, and
3.9.7). Tires shall not extend beyond the fenders. Unless approved by the purchaser and
permitted by state laws, the maximum ambulance body width shall not exceed 244 cm (96
in.), excluding mirrors, lights, and other safety appurtenances. The wide track axle shall be
furnished on dual rear wheeled vehicles, unless a narrow ambulance body is specified by the
purchaser (see 6.2-g).
3.4.11.3 HEIGHT.
Unless otherwise specified (see 6.2-h), overall height of the ambulance at curb weight (see
3.5.1) shall not exceed 279 cm (110 in.), including roof mounted equipment, but excluding
two-way radio antenna(s).
3.4.11.4 GROUND CLEARANCE.
With the exception of the chassis manufacturer's furnished and installed components, the
lowest part of the vehicle, when loaded to the GVWR, shall have a minimum of 20 cm (8in.)
of ground clearance, and 15 cm. (6") for chassis mounted components.
3.4.11.5 ANGLE OF APPROACH, RAMP BREAKOVER, AND DEPARTURE.
With the exception of the chassis manufacturer's furnished and installed components ,t,he
ambulance, loaded to the GVWR (including payload 3.5.2) with bumpers and rear step (down
if folding style), shall provide not less than the following clearance, measured in accordance
with SAE J689
Approach angle
20 degrees
Ramp breakover
10 degrees
Departure angle
10 degrees
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