electrical cables to the time-delay set timer. Then connect the test set to a 110-volt ac 60-Hz power supply. Again, you will need an air source regulated to 80 psi. 2. Extend the ram connecting plunger on the test set by pressing the reset button. Position the TRM on the test set and secure it with a test set clamp. Attach the time-delay g-sensing release mechanism firing link to the test set ram connecting plunger, connecting link, and con- necting pins. NOTE: At this point, you should ensure QA personnel are present to witness the elapsed time function. 3. Press the time-delay test set actuate button and record the time required to pull the firing link from the time-release g-sensing release mechanism. The elapsed time should not exceed 1.5 ± 0.1 seconds. If the time is greater than 1.5 ± 0.1 seconds, the unit must be replaced. FIRING PIN PROTRUSION CHECK.— To complete the firing pin protrusion check, you should perform the following steps in sequence. 1. With the cartridge body removed from the TRM, place the TRM protrusion gauge over the firing pin. 2. Check the position of the inner center shaft of the gauge. It must be flush or slightly above the outer case of the gauge. 3. If the firing pin fails this test, it must be replaced. FIRING MECHANISM COCKING TEST.— To complete the firing mechanism cocking test, you should perform the following steps in sequence. 1. Place the TRM clamp in a vise and position the TRM on the clamp. Screw the TRM cocking handle into the base of the TRM. Pull the cocking handle until the firing mechanism is fully extended. 2. In this position, install the test firing pin into the time-delay g-sensing release mechanism. The test firing pin is furnished as part of the TRM test set. 3. Release the tension on the cocking handle. Ensure the mechanism is cocked by pulling on the test firing pin. If the firing mechanism is cocked, it will be held firmly in place. 4. Remove the cocking handle from the TRM. Then remove the TRM from the clamp. The TRM is now cocked and ready for the barostat test check out. Barostat Check-Out To complete the barostat check-out, you should perform the following steps in sequence. 1. Connect the TRM test box to a 110-volt ac 60-Hz power supply. Ensure all protective plugs and parts of the test set are installed in the test box holes labeled “cocking control and altitude.” 2. Position the TRM in the test set and secure it with a clamp screw, as shown in figure 6-28. 3. Insert the operating handle through the hole in the test set labeled “firing control.” Screw the handle into the test firing pin. 4. Set the test box altimeter to 1013 millibars. With this setting, the altimeter will show a reading, in feet, above sea level and the altitude test will be relative to sea level. 5. Ensure the test set cover and seal are clean before closing the cover. A light application of pressure might be required to seal the cover. 6. Turn the vacuum release valve clockwise to the CLOSED position. . NOTE: Before you continue with the test, QA personnel should be present to witness the results. 7. Set the test set switch to the ON position. Make sure the vacuum pump starts and the red indicator light is illuminated. 8. While you monitor the test set altimeter, set the on/off switch to OFF when the altimeter reaches 30,000 feet. 9. Pull the operating handle to remove the test set firing pin from the TRM. The TRM should not operate at this time. 10. Monitor the test set altimeter while you slowly open the vacuum release valve. Open it until the altimeter indicates a steady descent rate, but not exceeding 200 feet per second. 11. Record the reading on the altimeter at which the TRM actuates. The actuation must occur at 13,000 ± 1,500 feet. If the TRM fails the test, it must be replaced. 12. After actuation, open the test set vacuum release valve. When the altimeter indicates zero, carefully open the test set cover. 13. Remove the clamp and disconnect the test firing pin from the TRM. Then remove the TRM from the test set. 6-42