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|  MIL-R-8236F
4.5.5.4 Fungus. Two inertia reel assemblies or subassemblies, not previously exposed to any other
environments, shall be subjected to fungus-resistance tests for a duration of 28 days in accordance with Method
508 of MIL-STD-810. After exposure to the test, the inertia reel assemblies or subassemblies shall be subjected to
post-tests specified (see 4.5.5). After completion of all tests, the inertia reel assemblies or subassemblies shal1 be
disassembled. Any evidence of fungus growth is a failure.
4.5.5.5 Salt fog. The inertia reel assemblies or subassemblies shall be tested in accordance with the salt fog
tests of Method 509 of MIL-STD-810. The test procedure shall be modified by the injection of sulfur dioxide gas
into the test chamber at 6 hour intervals for a time duration of 60 minutes and a flow rate at standard conditions of
50 cubic centimeters per hour per cubic foot of test chamber volume for a total salt fog duration of 24 hours. The
salt fog exposure shall be followed by a 24 hour drying time and then the cycle repeated for a total test time of 96
hours. After exposure to the tests. the inertia reel assemblies or subassemblies shall be subjected to post-tests
specified (see 4.5.5).
4.5.5.6 Sand and dust. The inertia reel assemblies or subassemblies shall be tested in accordance with
Method 510, Procedures I and 11 of MIL-STD-810. The temperature for the sand test shall be 170F for a duration
of 12 hours. The temperature for the dust test shall be 73F for a duration of 24 hours. After exposure to the tests,
the inertia reel assemblies or subassemblies shall be subjected to post-tests specified (see 4.5.5).
4.5.5.7 Vibration. Vibration tests shall be in accordance with Method 514, Categories 1,4,5, and 6. With
the inertia reel in the "auto-lock" position and unlocked, it shall be subjected to vibration along 3
muiurdly-perpendicular axes. At each position, the inertia red assemblies shall be subjected m vibration
throughout the range specified. Throughout this vibration, the inertia reel shall not lock. The test parameters for
each of the categories follows:
a. Category 1. The inertia reel assemblies shall be mounted in a packaged shipping configuration on the
vibration fixture using restraints and tie-downs typical of actual ground transport conditions. Excitation
shallbe applied along 3 mutually-perpendicular axes for a duration of 3 hours/axis. The random vibration
spectrum for this test is found in Figure 514.4-1.
b. Category 4. The inertia reel assemblies shall be mounted in a vibration fixture similar to the actual service
installation. The setup shall use the actual mounting provisions from the aircraft. The value of F1 shall
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equal 68 Hz (frequency of a C-130). The value of Li shall equal 0.3 g /Hz. The inertia reel assemblies
shall be vibrated for one (1) hour/axis following the vibration spectrum given in Figure 514.4-7.
c. Category 5. The inertia reel assemblies shall be mounted in the same manner as in Category 4. The
inertia reel assemblies shall be vibrated for 1 hour/axis using the vibration spectrum given in Figure
2
514.4-8. The value of W0 shall be equal to 0.04 g /Hz as determined by the criteria in Table 514.4-111.
d. Category 6. The inertia reel assemblies shall be mounted in the same manner as in Category 4. The
inertia reel harmonic frequencies shall be determined by performing a resonance search on the inertia reel.
Resonant frequencies of the inertia reel from 0 to 50 Hz shall be determined by conducting a resonance
search and vibrating 0.5 hour at each of the 4 worst resonant frequencies. This test shall be conducted with
the inertia reel mounted on each of the 3 orthogonal axes.
After completion of each of the vibration environment categories the inertia reel assemblies shall be subjected to
post-tests specified (see 4.5.5).
4.5.6 Life cycle tests For all inertia reel types. 4 inertia reel assemblies shall be subjected to each of the tests
described in the following paragraphs. Inertia reels subjected to the life cycle tests shall be disassembled at the end
of the qualification testing and inspected to assess the amount of wear on the external and internal inertia reel
assembly components.
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