MIL-T-62518 Trucks, Maintenance: With 9 To 37 Meters 30 To 120 Foot Multi-Position Aerial Platform, Modified CommercialThis specification covers diesel and gasoline engine driven, four-wheel, two-rear-wheel drive; four-wheel, four-wheel drive; and six-wheel, four-wheel-drive trucks having minimum gross vehicle weights GVW of 6800 kilograms kg 15,000 to 22 700 kg 50,000 pounds, equipped with maintenance bodies and 9 to 37 meters m 30 to 120 foot multi-position, articulating, boom type aerial platforms. Vehicles procured under this specification are commercial items which are warranted by the manufacturer as specified in acquisition documents.

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MIL-T-62518A

3.3.1  Speeds.  High and low speed requirements shall be met with the vehicle loaded to specified GVW.

3.3.1.1  High speed gradeability.  The vehicle shall ascend continuous grades specified in table VIII at 80 kilometers per hour (km/h) (50 miles per hour (mph)).  Gradeability

requirements shall be met with the main transmission in direct drive and, when a multispeed axle

or auxiliary transmission in high speed range.  Gradeability shall be verified with calculations in accordance with SAE J688 (see 6.3).

*                                        TABLE VIII.  Gradeability.

3.3.1.2  Low speed.  Low speed for vehicles with a manual transmission shall be calculated with the engine operating at not less than 35 percent of the recommended governed speed, and shall provide a vehicle speed of not more than 6.4 km/h (4 mph).

*    3.3.1.3  Maximum geared speed.  The maximum geared speed at engine governed speed shall be not less than 84 km/h (52 mph) for model 4x4 vehicles and not less than 93 km/h (58 mph) for model 4x2 and 6x4 vehicles.  Conformance to geared speed specified shall be determined by calculating in accordance with the following formula:

Maximum geared speed (km/h)             Governed speed (rpm) x 1.609         Total gear reduction x tire factor (see 6.3).

3.3.2  Service brakes.  The service brakes shall control and hold the vehicle, when loaded to its specified GVW, on a 30 percent grade.  The service brakes shall stop the vehicle, loaded to specified GVW, within the stopping distance requirements of Federal Motor Carrier Safety Regulation 393.52.

*    3.3.3  Upsetting stability.  With 1-1/2 times the specified load (see 3.6.5) placed in or suspended from the aerial basket(s), with the vehicle otherwise unloaded, and with all the outriggers extended or with the torsion bars on sizes 30 and 35, the articulated booms shall be capable of placing and holding the loaded aerial basket(s) in any attainable position of the

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