TM 10-1670-305-23&P
0010 00-12
ELECTRONIC TEST CHAMBER ASSEMBLY, MODEL 453
0010 00
OPERATION UNDER USUAL CONDITIONS - CONT
OPERATING PROCEDURE
RATE THRESHOLD (NO FIRE) TEST - CONT
7. The AR2 shall not actuate.
8. Set AR2 JUMP/OFF switch to OFF.
9. Repeat steps 2 through 8 using AR2 altitude dial setting of 10,500 feet, test chamber altitude
setting of 12,500 feet, and same fall rate setting. For this step, set AR2 JUMP/OFF switch to
OFF when altitude reaches 9,500 feet.
10. If no other tests are to be performed, follow shut down after testing procedure at end of this
work package.
ACTUATION ALTITUDE TEST
1. Ensure CHAMBER VENTED indicator (16) and DISPLAYS LOCKED indicator (18) are
extinguished.
2. Set AR2 altitude dial to 3000 feet. Close altitude chamber lid (2).
3. Press and hold HOLD DOWN TO SET switch (13); and set altitude to 5000 100 feet.
Release HOLD DOWN TO SET switch (13).
4. Press and hold HOLD DOWN TO SET switch (13); and set fall rate to 110 10 ft/sec.
Release HOLD DOWN TO SET switch (13).
5. If ALTITUDE DWELL indicator (6) is not illuminated or flashing, press GO TO ALT AND
DWELL switch (7). Wait until ALTITUDE DWELL indicator (6) stops flashing.
6. Set AR2 JUMP/OFF switch to JUMP. Press FALL switch (9).
7. Wait for AR2 to actuate and DISPLAYS LOCKED indicator (18) to illuminate.
8. Observe ALTITUDE (FT MSL) display (20) and FALL RATE (FT/SEC) display (19).
9. The AR2 must actuate within 300 feet of AR2 dial setting.
10. Set AR2 JUMP/OFF switch to OFF. Press HOLD DOWN TO COCK switch (10) and observe
movement of piston rod to right until AR2 cocks.
11. Repeat steps 1 through 10 using AR2 dial setting of 8000 feet, test chamber altitude setting
of 10,000 feet, and same fall rate setting.
12. Repeat steps 1 through 10 using AR2 altitude dial setting of 15,000 feet, test chamber
altitude setting of 17,000 feet and same fall rate setting. The altitude actuation tolerance is
500 feet for this setting.
