TM 10-1670-305-23&P
AUTOMATIC RIPCORD RELEASE, MODEL 451
0002 00
EQUIPMENT DESCRIPTION AND DATA
EQUIPMENT CHARACTERISTICS, CAPABILITIES AND FEATURES
CHARACTERISTICS
Senses rate-of-fall and altitude above mean sea level (MSL) (not above ground level (AGL).
Altitude dial is graduated to permit settings from 500 feet to 25,000 feet.
AR2 actuates when it falls through a preselected altitude at a fall rate of 80 ft/sec or greater.
CAPABILITIES AND FEATURES
Automatically removes ripcord pins on the parachute at a predetermined altitude.
Designed to remove ripcord pins on the reserve parachute but can be used with main parachute.
LOCATION AND DESCRIPTION OF MAJOR COMPONENTS
The AR2 basically consists of an aneroid with associated mechanism, rate-of-fall sensing
chamber, and a spring-loaded power cable. All components except the power cable and its
flexible conduit are contained in a housing. The housing provides all required chamber,
passages and mounting pads for each component. An altitude setting dial and JUMP/OFF switch
are mounted on the housing. The power cables end in a fixed eye, which connects to the
parachute ripcord pin. A lanyard assembly is attached to the power cable to protect the open end
of the power housing when detached from the AR2.
0002 00-1
Change 1
