Place the inertia reel control lever in the unlocked position. Extend the inertia reel straps, ensuring that they extend and retract freely and that the inertia reel action is smooth. Inspect the straps for deterioration and fraying and replace as required. With the inertia reel control handle in the unlocked position, while extending the straps, accelerate the motion sharply to simulate 3 g's. If the inertia reel does not lock, it must be replaced. Place the control lever in the locked position and allow the straps to retract into the reel. ensure that random pull checks during rewind allow no more than 2 inches of extension at any check.

Harness Release Actuator 

With the blast shield removed from the rear of the seat, inspect the harness release actuator and attaching hardware for corrosion or damage. With the harness release piston in the fully extended position (fig. 6-17), measure from the bottom of the actuator housing to the clevis

Figure 6-17.- Harness release actuator adjustment.

shoulder; it should be 5.06 0.03 inches. If not, remove the roll pin and adjust the clevis as required. With the piston in the fired position, verify the clearance between the bottom of the actuator housing and stop washer on top of the clevis is 0.09 0.06 inches. To release the piston from its fired position, with two 1/ 8-inch rods inserted into the locking dog holes, pry down on the two rods to spread the locking dogs and pull the piston out of the fired detent position. Move the piston to the full down position by pulling out on the manual detent pin, and continue pulling downward on the piston. Ensure that there is a clearence of 0.19 0.06 inch between the firing controls disconnect actuating arm and the shelf top with the harness release disconnect actuating arm in the disconnect position. With a push-pull spring scale, pull slowly upward on the harness release handle until the manual detent pin engages the harness release acutator piston. The force required to lock the piston should not exceed 40 pounds. Remove the spring scale and continue pulling upward on the harness release handle, ensuring that the handle has a minimum of 0.125 inch of over travel from the manual detent position. To check the firing control disconnect pin travel (fig. 6-15, callout B), insert a 1/ 8-inch diameter rod in the hole at the top of the firing control disconnect assembly. Mark an index line on the rod at the exact top of the hole in the firing control disconnect assembly. Pull upon the harness release handle (in overtravel position) and ensure that the rod does not exceed 3/ 16 inch of downward travel from its original up position. If travel exceeds 3/ 16 inch, adjust the lock pin to this tolerance. This test simulates firing control disconnect pin travel, and excessive travel could prevent seat ejection as a result of overtravel movement of the harness release handle. This causes unseating of the firing control disconnect fitting and release of the ejection control cables. Reset the harness release handle into the holder and pull the manual detent pin to reset the harness actuator. Verify that the lap belt and shoulder harness retaining pins protrude through the seat structure a minimum of 0.06 inch, not including the tapered end of the pin.