PARACHUTE RIGGER HANDBOOK
 

Glossary "D"

DAISY CHAIN
A method of gathering the suspension lines when field packing a parachute so as to reduce the possibility of their becoming entangled.

DAMAGE CHART
A graphic representation of a canopy used to identify and mark damaged areas for repair.

DART
A short, tapered seam.

DATA POCKET
Small patch pockets sewed to the inside and outside surfaces of a parachute container for carrying the parachute record card.

DECELERATE
To slow down. A free-falling body will decrease its rate of descent due to pressure of the atmosphere against its frontal area. This resistance will gradually increase as the falling body nears the earth due to increasing atmospheric pressure.

DENIER
A unit of measurement of silk in which the size of yarn is quoted as its weight per length. This is determined by weighing 9,000 meters and quoting the size of the yarn in grams. Thus, if 9,000 meters weigh 30 grams, the size of the yarn is then known as 30 denier.

DEPLOYMENT DEVICE
A sleeve or bag.

DEPLOYMENT
That portion of a parachute’s operation occurring from the moment of pack opening to the instant the suspension lines are fully stretched but prior to the inflation of the canopy. Also known as development.

 

DESIGNATED PARACHUTE RIGGER EXAMINER (DPRE)
A master parachute rigger appointed by the Administrator to conduct oral and practical tests required for the certification of parachute riggers.

DIAGONAL SEAM
A French fell seam of the canopy which joins two sections of a gore. Diagonal seams meet the centerline of the gore at angles of 45 degrees and 135 degrees.

DIAMETER
The greatest distance across a flat canopy, from skirt to skirt, measured when the canopy is lying flat. This measurement designates the size of the parachute in feet.

DIAPER
Generally, a fabric panel secured by the suspension lines which is sewn to and wrapped around the canopy. Used to control and reduce opening forces. Found mostly on round reserves.

DIE
The lower part of the tool used in a press to install snap fasteners or grommets.

DIRECT BAG STATIC LINE SYSTEM
A static line deployment system where the bag is attached to the static line and the canopy deploys free into the airstream.

 


 

DOUBLE THROW ZIGZAG STITCHING
Stitching in which the needle makes a center stitch between each left and right stitch. Also known as a No. 308 stitch.

DOUBLE-W
A three-point cross-stitch.

D-RING
A metal fitting shaped like a D into which snap connectors are hooked.

DROP TEST
Dropping a dummy or other load from an aircraft in flight or otherwise simulating a live jump to prove serviceability of a parachute.

DROP ZONE (DZ)
A specified area upon which personnel or equipment are dropped by parachute.

DRYING TOWER
A facility where parachutes are suspended for airing and drying.

DUAL PARACHUTE PACKS
A sport assembly consisting of a main and a reserve parachute.

DUMMY (PARACHUTE)
Torso-shaped dummy of variable weight used for testing parachutes; may be of fixed or articulated construction.

DUMMY DROP
A parachute test using a dummy as the suspended load.

DURABLE DOT FASTENER
The common snap fastener used for closing flaps, etc.

 

 
 
 
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