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Omnidirectional locking mechanism (MA-16 type inertia reel) |
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|  MIL-R-8236F
3.5.1.4 Omnidirectional locking mechanism (MA-16 type inertia reel). The MA-16 type inertia reel locking
mechanism shall lock the webbing spool at any increment of extension of webbing. and in all mounting
orientations shown in Figure 17, with a maximum movement of one and 1.5 inches of webbing payout as measured
from its initial position. Activation shall occur when the inertia reel housing is exposed to an acceleration of 6.0 G
in any direction and/or if the webbing is exposed to an acceleration of 2.5 G or greater. Conversely, locking shall
not occur when the inertia reel housing is exposed to an acceleration of 4.0 G or less or if the webbing is
accelerated at 1.5 G or less at 3 inches of webbing extension or 1.0 G or less at 12 or more inches of webbing
extension. When the manual control handle is in the "auto-lock" position and the inertia reel is automatically
activated, the webbing spool shall remain locked until unlocked by a complete cycle of the manual control handle
under a 25 pound load (see 4.5.1.3 and 4.5.1.4).
3.5.1.5 Dual mode inertia reels. Each mode of dual mode (see 6.4.6) type inertia reels shall function
independently (see 4.5. 1.5).
3.5.2 Flight performance. The inertia reel shall not inadvertently leek while in the automatic locking mode
due to the separate or combined effects of aircraft flight dynamics and deliberate occupant motion in the seat
during normal flight, combat flight maneuvers, or firing of weapon systems (see 4.5.2).
3.5.3 Stowage/take-up mechanism forces.
3.5.3.1 Cable drum extension/retraction forces (MA-1 and MA-2 type inertia reels). The force required to
extend the cable (see 6.4.1) of the MA-1 and MA-2 type inertia reels shall be not less than 2 pounds nor more than
4 pounds for the initial 2 inch increment of extension and not more than 6 pounds for extension from 2 to 17
inches of extension. The force may increase to a maximum of 18 pounds as the cable is extended from 17 inches to
full extension. The retracting force shall be from 2 to 18 pounds during retraction of the fully extended cable to 17
inches of cable extension and 2 to six 6 pounds from 17 inches to the initial 2 inch increment of extension. The
retracting force shall not be less than 2 pounds nor more than 4 pounds during the final 2 inch increment of
retraction. The drum shall lock the cable in increments of 0.50 inch or less (see 4.5.3.1).
3.5.3.2 Webbing spool extcnsion/retraction forces (MA-6, MA-8. MA-14. and MA-16 type inertia reels). The
force required to extend the webbing (see 6.4.1) of the MA-6, MA-8, MA-14, and MA-16 type inertia reels shall
not be less than 2 pounds nor more than 9 pounds during the first 22 inches of extension. The force may increase
to a maximum of 18 pounds as the webbing is extended from 22 inches to full extension. The retracting force shall
be from 2 to 18 pounds during retraction from the full extension to 22 inches of webbing extension and 2 to 9
pounds from 22 inches to full retraction The rotating spool shall lock the webbing in increments of 0.50 inch or
less (see 4.5.3.2).
3.5.4 Proof strength. inertia reel assemblies. including the mounting provisions, cable/webbing, and terminal
end fittings and harness fitting, shall withstand a static proof strength load for a period of 60 seconds with no
permanent deformation and may be placed in service upon removal of the load. Recalibration is allowed following
proof load testing. Each inertia reel type shall be capable of meeting all performance requirements specified herein
after the proof load test. Inertia reels having more than one locking mechanism shall meet the static strength
requirements for each locking mechanism. Description of the load instrumentation and method of inertia reel
attachment must be detailed in the test plan (see 4.5.4).
3.5.4.1 Proof strength of the MA-1, MA-2, and MA-6 type inertia reels. Type types of inertia reels shall
withstand a static proof strength load of 2.660 pounds (see 4.5.4.1).
3.5.4.2 Proof strength of the MA-8, MA-14. and MA-16 type inertia reels. These types of inertia reels shall
withstand a static proof strength load of 3,330 pounds (see 4.5.4.2).
3.5.5 Environmental conditions. The inertia reel assembly or subassembly under test shall withstand the
various environmental exposures specified herein without performance degradation below the performance levels
specified herein.
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