TEST CHAMBER ASSEMBLY, MODEL 452 OPERATION UNDER USUAL CONDITIONS

TM 10-1670-305-23&P TEST CHAMBER ASSEMBLY, MODEL 452 0009 00 OPERATION UNDER USUAL CONDITIONS INITIAL ADJUSTMENT BEFORE USE NOTE Ensure that the test chamber is in calibration (WP 0018 00). 1. Mount a AR2 test unit in the test chamber as follows: a. Verify that the AR2 test unit (3) is in the cocked condition, and the AR2 JUMP/OFF switch is in the OFF position. b. Remove the storage cable and piston rod cap from the AR2 (WP 0008 00). WARNING The heads of the air compressor and vacuum pump become hot with use and can cause burns to unprotected skin. Do not touch these components during operation or until they have been allowed to cool down after the test chamber has been switched off. NOTE The barometric pressure adjustment setting on the altimeter shall always remain at 29.92. c. Open altitude chamber lid (1). NOTE A specific dial setting for the AR2 is not required to conduct this test. NOTE It may be necessary to push the air cylinder rod (12) in or out to attach the piston rod of the test unit. d. Insert test unit into altitude chamber ensuring that the AR2 JUMP/OFF switch is aligned with the altitude chamber switch lever (2); use the cocking support (13) to align AR2 with air cylinder rod (12). e. Slightly raise the test unit to align the ball on air cylinder rod (12) with the recess in the piston rod of the test unit where the ball of the power cable connects. f. Close altitude chamber lid (1). NOTE Leave the AR2 JUMP/OFF switch in the OFF position at all times during these tests. 0009 00-3 Change 1