MIL-DTL-81014B
Measurements shall be taken before and after the endurance test and a wear analysis shall be made
showing the wear on each rubbing part. If during that portion of the test using the normal, or
automatic touchdown mode, the hook fails to release, the manual release shall be actuated. If the
hook then fails to release it shall be considered as an additional release failure. The number of
release failures during the endurance tests shall be not greater than two, not more than one of
which shall be in the manual mode. During the endurance tests, the hook shall be allowed to
relatch automatically. Not more than ten relatch failures shall be permitted during the complete
endurance test. Failure to relatch at loads in excess of the rated capacity of the hook shall not
constitute a failure. The forces required to actuate the manual release shall be checked for
no-load, full-load, and 60,000 pounds after each of the series of tests constituting the endurance
tests. The forces shall be not greater than the values specified in 3.9.6.1.3 (see 6.5).
4.5.2.9 Vibration test. The hook shall be subjected to a vibration test in accordance with
MIL-STD-810, Method 514.5, Procedure I, Category 18. Upon completion of this test the hook
shall be rigidly attached to a supporting fixture and the hook loaded. A vibrator producing
resonant frequencies in the hook under all loads stated below, shall be attached to the fixture or
the hook. All tests shall be conducted at 2.5 ± 0.5g acceleration level at the hook. The hook shall
be vibrated for the times and under the loads noted along each of its three mutually perpendicular
axes. The noted times are totals and shall be equally divided among testing on each of the three
axes. The tests shall consist of cycling vibration and resonant vibration with test time divided
equally between them. The cycling vibration shall be conducted between 20 and 300 cycles per
second and resonant frequencies in the hook shall be noted. Resonant vibration shall be
performed at all of the major resonant points with equal time being used for each point when
more than one resonant point is found. The hook release shall be actuated while the hook is at a
resonant point at the intervals and under the loads noted below. No inadvertent releases shall be
permitted.
TOTAL TIME
INTERVAL OF RELEASE
MODE OF RELEASE
LOAD
7 lbs.
0.5 hour
Once on each axis of vibration
Normal
6,000 lbs.
6 hours
Three times on each axis of vibration *
Normal
20,000 lbs.
4 hours
One time on each axis of vibration **
Manual
* At least one release shall be made for each resonant point, up to three if more than one
resonant point is found.
** While at the major resonant point.
4.5.2.10 High temperature test. The hook shall be tested in accordance with MIL-STD-810,
Method 501.4, Procedure II, table 501.4-I, induced conditions, for 48 hours. The hook shall be
tested through one cycle of each of the tests specified in 4.5.2.1.
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