MIL-DTL-62542C
(124 cm)), the BSLA shall exert a 27 000 lb tensile force over 20 in. of extension, then the force
shall be linearly reduced to a 10 000 lbs tensile force over the full range of extension. The BSLA
shall be capable of stopping and starting at any position under load during the cycle tests.
Auxiliary ambient air flow on the BSLA motor is permitted to meet the complete cycle time for
reliability testing.
4.7.1.3 Reliability. To verify the Mean Cycle Between Failure (MCBF), each of the four
BSLAs shall be tested for a total of 1150 operational reliability cycles, which equates to
4600 total operational reliability cycles (see 6.6). The testing shall verify requirements of 4.7.1,
4.7.1.1, and 4.7.2.2. Classification of all test incidents will be performed by Government
personnel and will constitute official results of the test for contractual compliance, based upon
3.3.6 and 4.7.2.2. Failure of any one BSLA to meet the requirements specified shall constitute
the failure of the entire test. If any modification is made to one test sample, each of the test
samples will be required to undergo complete retest with the same configuration changes.
4.7.2 R/M failure criteria.
4.7.2.1 Reliability verification. For reliability verification, failures shall be categorized as
follows:
a. Malfunction. A malfunction is any occurrence that prevents further operation of a
major BSLA component and requires that the component be replaced or repaired.
The major components are the motor, drivetrain, screw, housing, rod end bearing,
and ball return assembly.
b. Incident. An incident is any occurrence which prevents or could prevent the
BSLA from performing/completing one or more of its mission essential functions;
which poses a safety hazard to personnel; or which causes or could cause
catastrophic failure of the BSLA, semitrailer, or associated equipment.
c. Examples of malfunctions/incidents:
(1) Lubricant leaks during operation and storage (see 3.5.1.2, 3.5.1.3, 3.5.6, and
4.5.2.4).
(2) Water in excess of two ounces in the ball screw (see 3.5.6.1).
(3) Ball screw shows evidence of scoring (see 3.5.3.1).
(4) Rod end sealant permits water to enter threaded insert-cavity of the screw
(see 3.5.7).
(5) Slip clutch back drives in retraction or extension in less than 10 seconds
(see 3.3.5).
(6) Safety stop does not prevent screw from damaging the ball screw (see 3.5.3).
(7) Drive motor is not water resistant or is inadequate (see 3.3.1).
14
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business