button also sets the timer to zero. Remove the
lockwire from the drogue gun firing link and
remove the hex head plug from the base of the
drogue gun. Ensure the drogue gun is secured to
the test set with the clamp. Next, attach the drogue
gun firing link to the test set connecting ram
plunger with the connecting link and connecting
pins. Install the light interrupter into the base of
the drogue gun.
NOTE: Before proceeding any further with
the test, ensure quality assurance (QA) personnel
are present to witness the results.
3. Press the time-delay test set actuate button
and record the time required to pull the firing link
from the drogue gun. The elapsed time should not
exceed 0.5 ± 0.1 second. If the testis unsuccessful,
the drogue gun must be replaced.
4. Remove the light interrupter and drogue
gun from the test set and secure the equipment.
FIRING PIN PROTRUSION TEST.— To
complete the firing pin protrusion test, you should
perform the following steps in sequence.
1.
2.
Place the protrusion gauge over the firing
pin.
Check the position of the inner center shaft
of the gauge. It must be flush or slightly
above the gauge outer case, as shown in
figure 6-26.
3. If the firing pin fails this test, the drogue
gun must be replaced.
FIRING PIN COCKING TEST.— To com-
plete the firing pin cocking test, you should
perform the following steps in sequence.
1. Place the drogue gun clamp into a vise and
position the drogue gun on the clamp. Screw the
cocking handle into the base of the drogue gun.
2. Pull the handle until the firing mechanism
is fully extended. With the mechanism fully
extended, install the firing link into the drogue
gun.
3. Release the tension on the cocking handle.
If the mechanism is cocked, the firing link will
be held firmly in place.
4. Remove the handle and install the hex head
plug and washer.
5. Lockwire the firing link to the drogue gun
housing by inserting the lockwire through the
housing and roll pin, which is attached to the
firing link.
NOTE: At this point in the procedure, request
QA to inspect the engagement and lockwiring of
the sear.
Time-Release Mechanism Check-out
The time-release mechanism must be re-
moved from the ejection seat to perform
Figure 6-26.—Drogue gun firing pin protrusion check-out.
6-40
