MIL-DTL-19379C(SH)
TABLE II. Axial dynamic stiffness requirements.
Requirement limits
Mount type
Axial load (lb)
Dynamic stiffness (lb/in)
9
190 to 230
11M15
12
181 to 224
15
166 to 214
15
283 to 398
18
278 to 403
11M25
22
269 to 404
25
260 to 403
25
459 to 590
33
438 to 562
10M50
42
429 to 557
50
414 to 553
3.5.3 Static strength. When tested in accordance with 4.4.2.2, mounts shall not show any separation, break in
or between component parts, debonding, or permanent deformation of metal parts.
3.5.4 Fatigue-drift. When tested in accordance with 4.4.2.3, mounts shall not show any indication of damage to
the resilient element, rubber-to-metal bond, and metal parts. The drift occurring to the type 11M15, 11M25, and
10M50 mounts during these tests shall not exceed 0.017, 0.025, and 0.040 inch, respectively.
3.5.5 Delamination and porosity. When tested in accordance with 4.4.2.4, the rubber shall not show evidence
of porosity, separation into distinct layers, or laminations.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
a.
Qualification inspection (see 4.2).
b.
Conformance inspection (see 4.3).
4.2 Qualification inspection. The inspection and tests specified herein are required to qualify mounts produced
by a manufacturer for inclusion in the Qualified Products List (QPL) for this specification. Refer to 3.1 and 6.3.
Qualification inspection shall be performed on finished mounts and the rubber compound.
4.2.1 Qualification inspection of the rubber compound. Specimens described in table III shall be produced
from the rubber compound which is mixed for the manufacture of all mounts subjected to qualification inspection.
The manufacturer shall certify that the specimens are of the same material and equivalent cure as the mounts tested
for qualification. These specimens shall be subjected to the tests specified in table IV to determine compliance with
3.4.2.2. If any specimens tested fail to meet any requirement, all mounts manufactured for qualification from rubber
batches represented by that specimen shall be rejected.
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