TEST CHAMBER ASSEMBLY, MODEL 452
OPERATION UNDER USUAL CONDITIONS
INITIAL ADJUSTMENT BEFORE USE
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).
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.
The barometric pressure adjustment setting on the altimeter shall always remain
c. Open altitude chamber lid (1).
A specific dial setting for the AR2 is not required to conduct this test.
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).
Leave the AR2 JUMP/OFF switch in the OFF position at all times during these