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|  MIL-R-8236F
h. Load transmission (see 4.4.3.4.4).
i. Environmental (see 4.5.5).
j. Life cycle (see 4.5.6.3).
k. Workmanship (see 4.8).
4.4.4 Dimensions. The inertia reel dimensions shall be inspected to verify conformance with Figures 1
through 15. as applicable.
4.4.5 Weight. The inertia reels shall be weighed to verify compliance with the allowable maximum weights
specified herein.
4.5 Performance verification.
4.5.1 Automatic operation. The automatic locking characteristics of the inertia reel shall be demonstrated at
no- lock and lock levels. The cable/webbing payout (see 6.4.2) shall be measured with respect to a reference point,
along the cable/webbing. 2 inches from the centerline of the spool. Each test shall be repeated for all 4 mounting
orientations in Figure 17. The acceleration onset shall be calculated by the procedures shown in Figures 18 and
19. Test data shall be measured and recorded as a function of time using wideband techniques in accordance with
SAE J211, Class 60 instrumentation system requirements. The filtering level shall be 300 Hz for inertia reel
acceleration and webbing displacement measurements.
4.5.1.1 Unidirectional inertia reel acceleration (MA-1 type inertia reel).
4.5.1.1.1 No-lock test. The inertia reel cable or webbing lead- in strap. as applicable, shall be fixed at an
extension of 3 inches and with the control handle in the "auto-lock" position, then the inertia reel shall be subjected
G with an onset rate of between 75 and 300 G/see. The
to a peak rearward longitudinal acceleration of 1.5 G
test shall then be repeated using an onset rate between 300 and 500 G/sec. Both tests shall be repeated with the
cable or webbing lead-in strep. as applicable. fixed at a 12 inch extension and the inertia reel accelerated at 1.0 G.
The inertia reel shall not lock in any of the above tests.
4.5.1.1.2 Lock test. Locking capability shall be demonstrated by exposing the inertia red, with the cable or
webbing lead-in strap, as applicable, fixed at an extension of 3 inches and with the control handle in the
"auto-lock" position. to a rearward longitudinal acceleration of between 3.0 and 3.5 G with an onset rate of
between 75 and 300 G/sec. The test shall be repaired with an onset rate between 300 and 500 G/sec. Both tests
shall be repeated with the cable or webbing lead-in strap, as applicable, fixed at an extension of 12 inches. These
accelerations shall lock the inertia reel. Once the inertia reel is locked, the cable payout shall not extend more than
0.5 inch or webbing payout shall no{ extend more than 1 inch when a load of 25 to 100 pounds is applied to the
cable or webbing. Once the inertia reel locks, it shall unlock when the control handle is cycled to the
"manual-lock" position and back to the "auto-lock" position.
4.5.1.2 Multidirectional cable/webbing lead-in strap acceleration (MA-2, MA-6 and MA-8 type inertia reels).
4.5.1.2.1 No-lock test. The inertia reel cable or webbing lead- in strap, as applicable, at an extension of 3
inches and with the control handle in the "auto-lock" position. shall be subjected to a peak acceleration of 1.5 G
G with an onset rate of between 75 and 300 G/sec. The test shall then be repeated using an onset rate between
300 and 500 G/Sec. Both tests shall be repeated with the cable or webbing lead-in strap, as applicable, extended 12
inches and the webbing acceleration of 1.0 G. The inertia reel shall not lock in any of the above tests.
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