MIL-DTL-62542C
3.3.1 Drive motor. The motor shall be a 28 volt direct current (Vdc), reversible, electric
drive motor, and shall operate with the relay control box (see 3.4.2) for changing rotation
direction. The motor, when installed on the actuator, shall be water resistant, and shall meet the
performance requirements over the full range of BSLA operating characteristics.
3.3.1.1 Current draw. During intermittent duty operation of 20 second increments in
forward and reverse operation, the current draw of the drive motor shall not exceed
180 amperes (A) under all environmental conditions.
3.3.1.2 Thermal overload protection. A thermal overload switch or other self-resetting
protective device shall be provided to prevent damage to the drive motor during operation.
3.3.2 Dynamic load. Actuator shall be capable of operating at a starting tensile load of
52 000 pounds (lb) (23 1 308 Newtons (N)) at any point along the full range of extension and/or
retraction of the screw and operating for a period of not less than five (5) seconds.
3.3.3 Static load. The BSLA shall be capable of sustaining a 105 600 lb (469 732N)
static tensile load for a minimum of five seconds duration without structural damage to the BSLA
assembly. However, the slip clutch may slip and will not be cause for rejection.
3.3.4 Reverse drive. The BSLA shall hold and not reverse drive upon stopping a
52 000 lb (231 308) dynamic tensile load on the screw.
3.3.5 Slip clutch. The slip clutch setting shall be such that the BSLA shall retain a
minimum 52 000 lb tensile load on the screw. The clutch shall be designed to prevent damage to
the ball screw assembly when exceeding the 52 000 lb dynamic tensile load.
3.3.6 Mission essential functions (MEF). The BSLA's primary function is that of
stabilizing outriggers for the M860A1 semitrailer. The BSLA shall provide the MEFs listed
below to successfully complete its mission. These functions shall be accomplished without
causing damage to the M860A1 semitrailer, the primemover, or the payload.
a. Safely begin and continue movement under its own power without outside
assistance.
b. Raise and lower a weight of 52 000 lb for the last 18 inches (in.)
(46 centimeters (cm)) of the 37 in. (94 cm) of retraction within 1.5 minutes
extension or retraction.
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