MIL-B-62152 Bus, Motor: Ambulance, Intercity, 40 Passenger, 6X2 Or 6X4This specification covers a six-wheel, four- or two-rear wheel drive, diesel engine driven, intercity type motor bus ambulance, having a seating capacity for 40 adult passengers for long distance transportation. The bus has features to allow ready conversion to accommodate 18 litter patients, the driver, and four seated attendants. Except for customized ambulance conversion features, vehicles procured under this specification are commercial items. Frame and all chassis components, heating and air conditioning equipment shall be commercially available items. The vehicle shall be warranted as specified in the procurement documents.

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MIL-B-62152A(AT)

3.4.9 Suspension. The vehicle shall be equipped with a full air suspension system with

components having a rated capacity at least equal to the load imposed on each member, measured

at the ground, with vehicle loaded to GVW as specified in 3.2.5. The vehicle shall be provided

with hydraulic double-acting shock absorbers: 2 on the front and 4 on the rear drive axle(s).

Shock absorbers shall also be provided at the rear non-drive axle, if manufacturer's recommended

practice. The suspension design shall be such that the natural frequency of vertical vibration

about any transverse axis shall be less than 1.5 cycles per second at rated capacity for specified

GVW. Outside rear wheels shall be designed and located so that there will be no interference

with the use of tire chains. The air system shall incorporate leveling valves with a time delay

arranged to avoid constant air consumption due to road shocks. The suspension shall be provided

with a mechanism at each wheel to assure lifting of the wheel and axle when jacking the vehicle

from the applicable jacking location (see 3.5.2).

3.4.9.1 Air springs. The front axle shall be equipped with four air springs of 8 inches

minimum diameter, or two air springs of 12-1/2 inches minimum diameter. Each rear drive axle

shall be equipped with four air springs of 10 inches minimum diameter, and non-drive rear axle

shall be provided with the manufacturer's standard air springs. All axles shall have none of the

sprung weight carried on anything other than air springs. No other spring medium such as leaf,

coil or rubber springs shall be used in conjunction with air springs.

3.4.9.2 Radius rods and sway bars.

3.4.9.2.1 Radius rods. The front axle shall be provided with not less than four radius rods

to control lateral and longitudinal movement. Radius rods shall transmit driving and braking

forces to vehicle chassis and body. The rear axle tandem assembly shall be provided with not

less than eight radius rods: four to control longitudinal movement and four to control lateral

movement; or the drive axle shall have four radius rods to control lateral and longitudinal

movement. The non-drive axle shall be of an independent or swing arm suspension design

incorporating adequate means to control lateral and longitudinal loads such as upper and lower

"A" frames and an adjustable toe-in link. Each end of the radius rods shall be equipped with

rubber bushings that do not require periodic lubrication.

3.4.9.2.2 Sway bars. Sway bars, of adequate size and strength, shall be incorporated in

both front and rear suspension systems. Transverse front and wish-bone type radius rods at the

rear may be provided for lateral stability.