TM 10-1670-305-23&P DESCRIPTION AND USE OF CONTROLS AND INDICATORS 0007  00 TEST CHAMBER ASSEMBLY, MODEL 452 KEY CONTROL OR INDICATOR FUNCTION OR USE 1 Altimeter Indicates altitude inside chamber. 2 Fuse Protects test chamber from electrical overload. 3 ON/OFF switch Controls electrical power to the test chamber. 4 Indicator light Lights when test chamber is powered up. 5 PRESSURE CONTROL regulator Controls rate of fall. 6 WARNING decal Operational warning. 7 RAPID FALL dump switch Actuates altitude chamber dump solenoid to quickly reach sea level. 8 CLIMB/FALL/COCK switch Actuates solenoids to change altitude chamber conditions. CLIMB: Opens climb solenoid so that chamber altitude setting can be made. FALL: Closes climb solenoid so that controlled air pressure enters the chamber, causing gradual decrease in altitude in chamber. COCK: Opens air solenoid to cock AR2 under test. 9 Identification decal Identifies test chamber. 10 Functions decal Provides information on rate of fall during testing. 11 Control assembly Contains testing control components. 12 Altitude control regulator Used to set altitude inside chamber. 13 Pressure gage (PSI) Indicates relative rate of fall. 14 Altitude chamber switch lever Operates AR2 JUMP/OFF switch when AR2 is enclosed in altitude chamber. 15 Altitude chamber lid Allows access to altitude chamber. 16 Connections schematic decal Provides identification of electrical connectors (mounted inside control assembly housing panel). 17 Cocking support Aligns AR2 and altitude chamber piston rod. 0007  00-3 Change 1