TM 10-1670-305-23&P
TEST CHAMBER ASSEMBLY, MODEL 452
0009 00
OPERATION UNDER USUAL CONDITIONS
OPERATING PROCEDURE
12. Rotate the altitude chamber switch lever (2) clockwise 180. This will move the AR2
JUMP/OFF switch to OFF position.
13. Repeat steps 6 through 10.
WARNING
If malfunctions of the rate-of-fall mechanism occur, or if actuation altitude
deviates from the dial setting by more than the prescribed tolerance, remove the
AR2 from service.
14. To complete the test for rate-of-fall mechanism verification:
a. Conduct a no-fire test using the above procedure. Leave the altitude dial set at 5,500 feet
and set the rate of fall between 60 and 65 ft/sec. The rate of fall should be established
between 6,000 and 5,000 feet. Actuation of the AR2 should not occur at any altitude.
b. Conduct a second no-fire rate of fall test with the AR2 altitude dial set to 10,500 feet. Set
the rate of fall between 60 and 65 ft/sec. The rate of fall should be established between
11,000 and 10,000 feet. Actuation of the AR2 should not occur at any altitude.
15. To conduct actuation altitude tests:
a. Set the AR2 dial to 3,000 feet. Set the rate of fall between 100 and 120 ft/sec. The rate
of fall should be established between 3,500 and 2,500 feet. Actuation of the AR2 should
occur at 3,000 feet 300 feet.
b. Set the AR2 dial to 8,000 feet. Set the rate of fall between 100 and 120 ft/sec. The rate
of fall should be established between 8,500 and 7,500 feet. Actuation of the AR2 should
occur at 8,000 300 feet.
c. Set the AR2 dial to 15,000 feet. Set the rate of fall between 100 and 120 ft/sec. The rate
of fall should be established between 15,500 and 14,500 feet. Actuation of the AR2
should occur at 15,000 feet 500 feet.
d. Set the AR2 dial to the MSL altitude where actuation is required for a normal mission
profile. Set the rate of fall between 100 and 120 ft/sec. The rate of fall should be
established between 500 feet above and 500 feet below the dial setting. The altitude
actuation tolerance is 300 feet for dial settings below 10,000 feet MSL and 500 feet
for settings of 10,000 or above.
CAUTION
To protect altimeter from damage, do not press RAPID FALL DUMP switch at
altitudes greater than 25,000 feet.
16. Depress and hold the RAPID FALL DUMP switch (7) until the test chamber is dumped.
0009 00-9
Change 1
