TEST CHAMBER ASSEMBLY, MODEL 452
OPERATION UNDER USUAL CONDITIONS - CONT
Operating procedure for the Model 452 test chamber Assembly consists of
evaluation testing of the AR2.
1. Verify that the AR2 JUMP/OFF switch is in OFF position, the storage cable and piston rod
cap are removed, refer to WP 0008 00, and that AR2 is cocked.
If there is any indication of a leak in the aneroid, remove the AR2 from service. A
leaking aneroid may cause a malfunction which may result in death of
2. Check the AR2 for aneroid leakage at ground level before testing (WP 0008).
Ensure that the AR2 is cocked and the piston rod cap is removed before
performing test procedure.
3. Set AR2 attitude dial to 5,500 feet.
4. Install AR2 in the test chamber (Refer to initial adjustments before use).
To avoid damage to test chamber do not switch it on while the air compressor or
vacuum pump is under load (while the altitude chamber is under vacuum or the
air cylinder is pressurized). If it has recently been used, wait one to two minutes
for pressure trapped in the system to bleed off.
5. Switch ON the test chamber. The indicator light (6) will illuminate, and the air compressor
and vacuum pump will start. When switching the test chamber ON, immediately look under
the transparent altitude chamber at the ends of both the air compressor and vacuum pump to
ensure that the cooling fans are spinning on both units. If either of the fans is not spinning,
immediately cycle the CLIMB/FALL/COCK switch (8) between Fall and Cock until the fans
Do not move climb/fall/cock switch on test chamber to cock unless AR2
JUMP/OFF switch is in the fully off position. Attempting to cock the mechanism
with the switch in an intermediate position may damage internal components and
render the AR2 inoperative. This will prevent deployment of a parachute and
may result in death of parachutist.