Air Dam - answera flexible air-deflecting panel usually located below the radiator support.
Approach Angle - answerthe angle between the plane of the carrier bed or platform and the ground.
Auxiliary Braking Device - answera device which attaches to the disabled vehicle to assist the tow truc...
TOW TRUCK "W" ENDORSEMENT EXAM
Air Dam - answera flexible air-deflecting panel usually located below the radiator support.
Approach Angle - answerthe angle between the plane of the carrier bed or platform and the
ground.
Auxiliary Braking Device - answera device which attaches to the disabled vehicle to assist
the tow truck's brakes in retarding or stopping both vehicles.
Auxiliary Equipment - answerequipment that is not necessary to perform the basic function
of the primary equipment.
Auxiliary Tow Lights - answerstop, tail and turn signal lights attached to the trailing end of
the towed vehicle, and operated as part of the towing vehicle's lighting system. Also see
"Drag Lights".
Auxiliary Winch - answersame as "Drag Winch": a winch whose cable goes directly to the
load, and not over the end of the boom.
Axle Covers - answerdevices used to cover drive axle shaft openings to help prevent
contamination or loss of wheel bearing lubrication during towing or transporting operations.
Bed Locks - answerdevices on a vehicle with a movable bed that secure the bed in place
while traveling.
Boom - answera structural member, extending from a mast, that supports the load and is
used to hold, extend or lift a load free of the ground and clear of the tow truck body.
Breaking Strength Rating - answerthe maximum weight or load, as established by the
manufacturer, that new, unused equipment can bear, under ideal laboratory conditions,
without being damaged.
Bridle - answera V or Y type coupling device used to attach and center a cable in recovery,
loading and unloading operations.
Cab - answerthe driver/passenger-carrying compartment of a truck
Cab-to-Axle (CA) - answerthe distance from the back of the truck cab to the center of the
rear axle. See chassis manufacturer's dimensions.
Cable - answersteel wire rope used for pulling or supporting a load.
Car Carrier - answera vehicle equipped to transport one to three motor vehicles on a flat
platform that slides or tilts to the ground to facilitate the loading and unloading of these
vehicles; may or may not have an additional assembly attached to the rear to facilitate
towing an additional vehicle. These units are also known as slidebacks, rollbacks,
transporting equipment carriers and flatbeds.
Chain Grade or Strength Rating - answerthe number placed on chain by the manufacturer as
part of the National Association of Chain Manufacturers' system of identifying chain. Chain
manufactured by NACM standards also bears a letter that identifies the manufacturer.
, Cross-Member - answera general term applied to transverse members in the understructure
of a vehicle.
Curb Weight - answerthe unloaded weight of a truck, axle or axle combination.
Disabled Vehicle - answerfor purposes of this manual, this term refers to a motor vehicle
that is illegally parked, abandoned, or disabled (unable to operate under its own power), or a
motor vehicle that has been involved in an accident.
Dolly - answerA four-wheel carriage used, in towing, to support the trailing end of a towed
vehicle.
Drag Lights - answersame as "Auxiliary Tow Lights": stop, tail and turn signal lights attached
to the trailing end of the towed vehicle, and operated as part of the towing vehicle's lighting
system.
Drag Winch - answera winch whose cable goes directly to the load, and not over the end of
the boom. Also see "Auxiliary Winch".
Driveline - answera vehicle's drive shaft and associated joints.
Fascia - answerflexible material commonly used as a bumper cover (may extend below the
bumper).
Forks - answerdevices attached to the lift bar (also see "Tow Bar") for lifting a vehicle by the
axle, frame or structural member. May be classified as chain, axle or frame forks.
Front Axle Weight (FAW) - answerthe curb weight (unloaded weight) of the front axle or front
axle combination.
Grab Hook - answera chain hook that will not slide; used with safety chains and some tow
sling hook-ups.
Gross Axle Weight Rating (GAWR) - answerthe front or rear axle weight. This is the value
specified by the vehicle manufacturer as the load-carrying capacity of a single axle system,
measured where the tires touch the ground.
Gross Combination Weight Rating (GCWR) - answerthe gross vehicle weight rating (GVWR)
of the power unit (tow truck), plus the GVWR of each vehicle in the combination (the
vehicles(s) being towed or transported). GCWR includes everything that moves with the
towing or transporting vehicle.
Gross Vehicle Weight Rating (GVWR) - answerthe weight of a vehicle, consisting of the
unladen weight plus the maximum carrying capacity recommended by the vehicle's
manufacturer
Hazard Lights - answerflashing, rotating/revolving or oscillating yellow or amber light(s) on a
tow truck.
Headboard - answera vertical device of sufficient strength, permanently affixed (usually to
the bed) between the load and the cab of the towing vehicle, that serves to protect the cab
and its occupants.
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