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Page Title:
Omnidirectional webbing lead-in strap and inertia reel acceleration |
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|  MIL-R-8236F
4.5.1.2.2 Lock test. Locking capability shall be demonstrated by exposing 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, to a
cable or webbing acceleration of between 3.0 and 3.5 G with an onset rate of between 75 and 300 G/see. The test
shall be repeated with an onset rate between 300 and 500 G/see. Both tests shall be repeated with the cable or
webbing lead-in strap, as applicable. extended 12 inches. These accelerations shall lock the inertia reel. The cable
payout shall not exceed 1 inch or the webbing payout shall not exceed 1.5 inches. For measurement purposes, the
force exerted on the lead-in cable or webbing after locking shall be between 25 and 100 pounds. 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.
4.5.1.3 Omnidirectional webbing lead-in strap and inertia reel acceleration (MA-14 and MA-16 type inertia
reels).
4.5.1.3.1 Omnidirectional webbing lead-in strap acceleration.
4.5.1.3.1.1 No-lock test. The inertia reel webbing lead-in strap 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 webbing lead-in strap extended 12 inches and the webbing acceleration of 1.0
G. The inertia reel shall not lock in any of the above tests.
4.5.1.3.1.2 Lock test. Locking capability shall be demonstrated by exposing the inertia reel webbing lead-in
strap, at an extension of 3 inches and with the control handle in the "auto-lock" position. to a webbing acceleration
of between 3.(1 and 3.5 G with an onset rate of between 75 and 300 G/sec. The test shall be repeated with an onset
rate between 300 and 500 G/sec. Both tests shall be repeated with the webbing lead-in strap extended 12 inches.
These accelerations shall lock the inertia reel. The webbing payout shall not exceed 1.5 inches. For measurement
purposes, the force exerted on the lead-in webbing after locking shall be between 25 and 100 pounds. 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.
4.5.1.3.2 Omnidirectional inertia reel acceleration. With the inertia reel webbing lead-in strap at an
extension of 3 inches and with the control handle in the "auto-lock" position, the inertia reel shall undergo 3
acceleration tests. The webbing position shall be fixed relative to the inertia reel during these tests. The first test
shall have a peak acceleration of 3.0 to 4.0 G, an onset rate of 300 to 700 G/sec, and a velocity change of 0.7 to 1.8
ft/sec. The second test shall have a peak acceleration of 6.0 to 7.0 G. and an onset rate of 300 to 700 G/sec. The
velocity change is left arbitrary. The third test shall have a peak acceleration of 8.0 to 12.0 G, an onset rate of 300
to 700 G/sec, and a velocity change of 2.9 to 15.5 ft/sec. All acceleration vectors shall lie in the plane
perpendicular to the axis of the spool. These tests shall be repeated with all the same test conditions, except that
the acceleration vector shall be rotated 90 in the plane perpendicular to the axis of the spool. The direction of
aeceleration along each axis shall be alternated in each series of tests. The webbing shall not lock with an
acceleration of less than 4.0 G and shall lock when the acceleration exceeds 6.0 G. Once the inertia reel locks, the
webbing shall not extend more than 1 inch when a load of 25 to 100 pounds is placed on the webbing. The inertia
reel shall be unlocked when the manual control handle is cycled to the "manual-lock" position and back to the
"auto-lock" position.
4.5.1.4 Omnidirectional inertia reel assembly lateral acceleration (MA-16 type inertia reel). In addition to the
acceleration tests specified (see 4.5.1.3). the MA-16 inertia reel shall also be exposed to accelerations in the
direction of the spool axis. The inertia reel. with the webbing lead-in strap fixed relative to the inertia reel at an
extension of 3 inches and with the control handle in the "auto-lock" position. shall be subjected to 3 tests. The first
test shall have a peak acceleration of 3.0 to 4.0 G. an onset rate of 300 to 700 G/sec and a velocity change of 0.7 to
1.8 ft/sec. The second test shall have a peak acceleration of 6.0 to 7.0 G, and an onset rate of 300 to 700 G/sec.
The velocity change is left arbitrary. The third test shall have a peak acceleration of 8.0 to 12.0 G, an onset rate of
300 to 700 G/sec, and a velocity change of 2.9 to 15.5 ft/sec. All acceleration vectors shall be parallel to the spool
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