MIL-DTL-62542C
3.5.2 Gear case lubrication. The gear case shall be filled with a petroleum based
hydraulic fluid capable of operating in the temperature ranges as specified in 3.6.2. Provisions
shall be made and shall be readily accessible to allow periodic maintenance to externally add/drain
the hydraulic fluid.
3.5.2.1 Oil level indicator. An oil level indicator shall be provided to indicate a sufficient,
safe operating lubricant level, visible in the BSLA gear box when the BSLA is in the stowed
position of 20° from the vertical with the rod end up.
3.5.3 Ball and thread. The ball screw shall be provided with a safety stop to prevent
exceeding the maximum limits of the BSLA in the fully extended or retracted position. The
backlash shall not exceed 0.013 in. (0.033 millimeter).
3.5.3.1 Ball screw scoring. There shall be no evidence of scoring of the ball screw
throughout its entire length after 1150 reliability/maintainability (R/M) duty cycles.
3.5.4 Manual override. An external shaft for manual extension and retraction of the
BSLA shall be provided in the event of the drive motor failure, using a standard English-type
six-point socket and/or a wrench.
3.5.5 Ventilation. The BSLA gear case shall be vented to atmosphere without allowing
water entry by means of a relief valve installed on the BSLA casting. The valve shall be located
approximately 11 in. (27.9 cm) vertically above the centerline of the hole in the mounting clevis of
the BSLA when positioned 20° from vertical.
3.5.5.1 Water intrusion. The BSLA design shall be capable of meeting the vehicle
fording requirement of 31 in. (78.7 cm). This design shall not allow water to enter the ball screw
assembly in the area measured along the axis of the tube 11 in. (27.9 cm) up from the center of
the hole of the lower mounting clevis pin when the BSLA is placed 20° from vertical.
3.5.6 Seals. Ice scraper and wiper seals shall be provided to prevent the entry of water
or other foreign matter into the ball nut mechanism.
3.5.6.1 Water exclusion. The total accumulation of water in the ball screw tube shall not
be more than 2 ounces (oz) (57 grams (g)). There shall be no water intrusion into the BSLA
housing assembly.
3.5.7 Rod end sealant. A waterproof sealant shall be applied to the rod end threads,
keyway, and face of screw prior to assembly into the screw to prevent the entry of water into the
threaded insert-cavity of the screw.
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