satisfaction of the work center supervisor/division
officer, is required before the designation
qualified can be assigned.
RAbbreviation for radius.
RATE OF DESCENTThe speed that a
parachute descends through the air. The rate
varies according to atmospheric pressure, weight
of load, movement of air (updraft and down-
draft), and size, design, and condition of
RAVEL (UNRAVEL)TO separate, untwist
or unwind, leaving a frayed or ragged edge.
Ravel is the preferred word to describe such a
RECEIVER ASSEMBLY, AUTOMATIC
PARACHUTE RIPCORD RELEASEThat
part of the cartridge-actuated automatic ripcord
release that houses the aneroid, sear, and hammer.
REFAbbreviation for reference.
REFILL (In reference to oxygen cylinders)
To refill is to recharge a cylinder, regardless of
the residual pressure remaining within the
measure that enhances the basic integrity of a
structure, joint or assembly; for example, the tape
or webbing used to strengthen parts of a canopy,
container, harness, etc., in a parachute assembly.
See also WEBBING and REINFORCEMENT.
RELEASE ASSEMBLY, RIPCORD HOUS-
ING, MANUALAn assembly that releases the
ripcord housing at the top end flap when the
parachute is at full suspension line stretch.
REPAIRS, MAJORRepairs requiring
special equipment, personnel, or materials
normally not available at intermediate or local
levels of maintenance.
REPAIRS, MINORRepairs that can be
effected at intermediate or local levels of
RETAINING SLEEVEA series of stowage
RFIReady for issue.
RIGTo assemble and adjust; to equip. For
example, the act of rigging a parachute assembly
consists of assembling all component parts in
preparation for packing.
RING, VENTA molded rubber ring in
the vent collar. It stretches when the air
rushes into the canopy as the parachute begins to
RIPCORDA locking device that secures the
folded parachute within the container and that
effects the release of the parachute. The ripcord
consists basically of locking pins, a flexible
cable and a handle. See also AUTOMATIC
PARACHUTE RIPCORD RELEASE; BALL,
CABLE RETAINING; CABLE, RIPCORD;
CLAMP, RIPCORD HOUSING; HANDLE,
RIPCORD; HOUSING, EXTENSIBLE RIP-
CORD; HOUSING, RIPCORD; IN, RIP-
CORD LOCKING; POCKET, and RIPCORD
RIPCORD PIN RETENTION TIEA
thread of a predetermined value that is usually
secured to a lead ripcord pin of a packed
parachute. Its function is to retain a ripcord pin
in its cone and prevent premature disengagement
of the pin from the cone. USE ONLY AS
RISERThe webbing that connects an
integrated torso suit or harness to the canopy
assembly on parachutes. The riser is composed
of two lift webs, and there are two risers on each
RUNOFFSewing not on a seam or cloth.
RUPTUREOne or more yarns of suspen-
sion line casing being cut or severed, sometimes
exposing the inner core. Occasionally, tears, cuts,
or other forms of damage to the canopy are
defined as a rupture when caused by dynamic load
SADDLEThat part of the main lift web of
the harness that provides a seat or sling for the
SAFETY TIEA low strength thread that
serves to indicate that an assembly has not been
damaged, tampered with, or opened since the last