MAGS
A wheel cast in magnesium, then machined for
attachment to hub, etc. Used primarily for racing because of extremely light
weight, but sometimes used or simulated to add a racy appearance.
MAIN FRAMING
See Body Framing
MAIN IRON
(Slang) Main track.
MAIN RESERVOIR (air brake)
A tank on an engine for storing the main air
supply. So called in distinction from
the auxiliary reservoirs under each car.
MAIN TRACK
A designated track upon which trains are operated
by timetable, train order, or both, or the use of which is governed by block
signals.
Maintenance Visual Reminder
When any maintenance limit has been approached within a preset percentage, the Check Engine Light will blink, six times each time the ignition key is turned from off to o n. ( Detroit )
MANIFEST
A document describing a shipment or the contents of
a vehicle or ship.
MANIFOLD
The connector which ducts the gas from the inflator
to the diffuser and air cushion assembly.
MANNER OF COLLISION
Applies to accidents in which the first harmful
event was a collision between two motor vehicles in transport and is identified
as one of the following; 1) angle: a
collision of the front of one vehicle with the side or corner of another. 2) Head-on:
a collision of the front end of one vehicle with front end of another
vehicle while the two are traveling in
opposite directions. 3) sideswipe:
a collision of two vehicles in which the sides of both vehicles
sustained minimal engagements, 4) other: any collision not classifiable as one
of the above.
MANUAL BLOCK SIGNAL SYSTEM
A block signal system wherein the use of each block
is governed by block signals controlled manually.
MANUFACTURING FEASIBILITY
The acknowledgment by "Manufacturing"
that proposed Engineering part designs and product material specifications will
permit volume manufacture consistent with product engineering requirements, and
that full consideration has been given to program time in, quality control
objectives, available facilities and tooling, and the use of proven
manufacturing techniques, methods and processes.
MARKED CAPACITY
The carrying capacity of a car as marked or
stenciled on the car.
MARKER
Front and rear signals of a train (flags or lamps)
.
MARKER LIGHTS
Also called clearance or running lights. See clearance lights.
MARKS
Letters, numbers, and or characters placed on a
package for purposes of identification. Memorandum bill of lading, A duplicate copy of a bill of lading.
MASH WELD
Type of butt weld similar to "Foil Weld"
except that the panels overlap slightly and no foil is used.
MASS
(m): The ability of an object to resist a change of vector velocity when acted upon by external forces. The ability of an object to exert an
attractive force upon another object.
Weight divided by gravity
MATCH CHECK
Checking of the fit-up of detail parts by loosely
assembling body-in-white components in a balloon checking fixture.
MATCH-MERGE
A direct, mechanical releasing of current model
year components into a "carry-over", forward year model.
MATS
(Material and Toxicology System). Documents the
Materials Engineering approval and toxicology clearance of materials. (Ford
derived)
MAXIMUM BRAKE HORSEPOWER
Maximum brake horsepower is the maximum power
output of an engine. It occurs at a
particular running speed and throttle setting.
MAXIMUM ENGAGEMENT
Greatest penetration of one body, such as a
vehicle, by another during a collision; instant of greatest force between
colliding objects; time and place of this occurrence; position of bodies with
respect to each other at this instant.
MAXIMUM LOAD
Maximum load is the maximum payload weight which
may be loaded onto a vehicle (a truck or trailer) It does not include the unladen weight of the vehicle
MAXIMUM LOAD RATING
(tire)
Maximum load rating is the load rating to the maximum permissible
inflation pressure for that tire
MAXIMUM LOADED VEHICLE WEIGHT
Maximum loaded vehicle weight is the sum of the
unladen weight and the maximum load.
(A) Curb weight; (B) Accessory
weight; © Vehicle empty weight and;
(D) Production options weight
MBD
(Major Build Document) Step by Step process
definition.
MCPHERSON SUSPENSION
The McPherson suspension is a type of automotive
suspension that utilizes only a single control arm and a single ball joint The spring in this type of suspension is
compressed between the lower control arm and an attachment to the frame or body
of the vehicle
MEAN DECELERATION
A second parameter important in describing the
severity of a crash is the mean or average deceleration of the undeformed
section of the car. A car may crash
into a concrete barrier or into a utility pole at 30 M.P.H. In each case the Delta V is the same. But in hitting the barrier the car may crush
2 feet giving an average deceleration of 15 g's. In hitting the pole it may crush 4 feet, giving an average
deceleration of 7.5 g's.
MEAT RACK (refrigerated car)
The supports near the ceiling from which meat is
suspended. Also called beef rail.
MECHANICAL
A vehicle which includes a chassis intended for a
specific program release. Unless otherwise specified, the chassis will carry
the intended engine and driveline components for the same intended program.
Body and sheet metal may be of current production nature, modified only to the
extent necessary to adapt to that chassis. The dash panel and floor pan will be
as intended for the specific program release unless otherwise specified.
(Normally 19 months prior to Job #1.)
MECHANICAL EFFICIENCY
The ratio between the brake horsepower and the
indicated or total horsepower.
MECHANICAL REFRIGERATOR
A car equipped with a diesel powered refrigerating
unit under thermostatic control.
MECHANICS
The analysis of the action of forces on matter or
material systems.
MECHANICS START
A feature of the ignition interlock system which
enables starting of the vehicle regardless of belt conditions if no one is
sitting in any front seating position.
MEDIAN
The portion of a highway separating the roadways
for traffic in opposite directions. If
the median is more than about 100 feet (30m), the area is usually considered as
roadside.
MEDIUM SPEED
Not exceeding 30 miles per hour.
MEDIUM TRUCK
Any single unit truck with a GVW between 10,000 and
26,000 pounds.
MERCHANDISE CAR
A car containing several less-than-car load
shipments.
METAL DRAFT
(Plate) A pointed metal sheet, usually aluminum, on
which layouts are drawn for accuracy.
METAL SCRAPES
Caused by sheet body metal or other body parts
being dragged across the surface with little pressure
METAL SCRATCHES
Caused by sheet body metal or other body metal
being dragged lightly over the surface area.
METAL TO METAL POSITION
(compression)
The point of maximum compression travel limited by interference of
substantially rigid members.
METAL TO METAL POSITION
(rebound)
The point of maximum rebound travel limited by interference of
substantially rigid members.
MEXICAN OVERDRIVE
Kicking vehicle out of gear on downgrade.
MIDDLE ORDINATE
(mo): The
perpendicular distance from the mid-point of a chord to the circumference.
MIG WELDING
Metal insert gas arc welding where the consumable
electrode provides the filler and the weldment is shielded from contamination by a jet of inert gas.
MILE
5,280 feet. Also called statute mile, a unit of
distance on land in English speaking countries equal to 5280 feet, or 1760
yards. 2. Also called nautical mile,
geographical mile, or sea mile, a unit of distance officially fixed in Great
Britain at 6080 feet and formally fixed in the US at 6080.2 feet, but now
officially replaced in the US by the International nautical mile. 3. Also called international nautical mile
or international air mile, a unit of distance in sea and air navigation equal
to 1.852 kilometers, or 6076.1033 feet.
4. any of various other units of distance or length at different periods
and in different countries. Cf. Roman
mile, Swedish mile. [ME; OE mil < L
milia (passuum) a thousand (paces)]
MILEAGE
Distance in miles.
MILLING IN TRANSIT
The stopping of grain, lumber, etc, at point
located between the points of origin and destination for the purpose of
milling.
MINI (Slang)
Less than 100-pound shipment.
MINI GATE
Partial side frame used as stand-by for automatic
front end assembly fixture on underbody automatic line.
MINI WELD
Welding two metals less than .035 using light
weight weld gun with small electric tips.
MINIMUM RATE
The lowest lawful rate that may be charged for
transporting a shipment.
MIRROR BUTTON
Metal or plastic pad that is bonded to the inside
of a windshield/windscreen as the attachment for a rear view mirror.
(1) MIS, (3) MIS
1 "Month-in-service" Reports, 3 Months,
etc.
MIXED TRUCKLOAD
A truckload of different freight articles combined
into a single shipment.
MOBOT
Trade name for a modularized robot utilizing from
one to nine different axes.
MODE
Frequently used to refer to the basic divisions of
the transportation industry. The principal
modes of transportation are truck, rail, air and water.
MODESTY PANEL
Sheet metal below bumpers that conceals chassis
members. Also called modesty skirt.
MODIFIER
A circumstance that alters an attribute permanently
or temporarily.
MODULAR ASSEMBLY
Method of body assembly where operations are
confined to joining a few large modules rather than individual parts.
MOHAWK
Portion of vehicle roof between the two roof
ditches.
MOISTURE-RELEASE VALVE
A valve in the air line that emits some air each
time the brakes of the tractor are applied.
Prevents water and moisture from collecting in the air system.
MOLD
The form from which an object receives its form
when cast.
MOLDING
A strip of material, either sunken or projected and
usually decorative.
MOMENT OF INERTIA
A measure of the rotational inertia of a body.
MOMENTS
The external moments acting on the vehicle can be
summed into one moment vector having the following components:
MOMENTUM
Momentum is the product of the mass of a moving
object and the velocity of the object
momentum is a vector quantity
MOMENTUM, CONSERVATION OF
The principle that when a system of masses is
subject only to internal forces that the masses of the system exert on one
another the total vector momentum of the system is constant.
MONKEY MOTION
Glass drop motion where direction abruptly changes
one or more times to clear body structure.
MOPED
A motor powered bicycle.
MOT
Ministry of Transport (Canadian Safety Agency)
MOTIF
Main theme of design or creative arrangement.
MOTOR CARRIER ABREV.
AIM
MOTOR CARRIER ABREV.
All
MOTOR CARRIER ABREV.
CR
MOTOR CARRIER ABREV.
CVIS
MOTOR CARRIER ABREV.
DII
MOTOR CARRIER ABREV.
DIM
MOTOR CARRIER ABREV.
DOT
MOTOR CARRIER ABREV.
DRI
MOTOR CARRIER ABREV.
DRM
MOTOR CARRIER ABREV.
EHI
MOTOR CARRIER ABREV.
ESM
MOTOR CARRIER ABREV.
FMCSA
MOTOR CARRIER ABREV.
FMCSR
MOTOR CARRIER ABREV.
HAZMAT
MOTOR CARRIER ABREV.
HMR
MOTOR CARRIER ABREV.
HMRI
MOTOR CARRIER ABREV.
HMRM
MOTOR CARRIER ABREV.
ISS
MOTOR CARRIER ABREV.
ISTEA
MOTOR CARRIER ABREV.
MCMIS
MOTOR CARRIER ABREV.
MCSAP
MOTOR CARRIER ABREV.
MCSIP
MOTOR CARRIER ABREV.
MVM
MOTOR CARRIER ABREV.
NGA
MOTOR CARRIER ABREV.
OOS
MOTOR CARRIER ABREV.
PCAP
MOTOR CARRIER ABREV.
PRISM
MOTOR CARRIER ABREV.
PU
MOTOR CARRIER ABREV.
RAI
MOTOR CARRIER ABREV.
RAR
MOTOR CARRIER ABREV.
RC
MOTOR CARRIER ABREV.
RSPA
MOTOR CARRIER ABREV.
SafeStat
MOTOR CARRIER ABREV.
SEA
MOTOR CARRIER ABREV.
SMRI
MOTOR CARRIER ABREV.
SMRM
MOTOR CARRIER ABREV.
VII
MOTOR CARRIER ABREV.
VIM
MOTOR CARRIER ABREV.
VMT
MOTOR CARRIER ABREV.
VRI
MOTOR CARRIER ABREV.
VRM
MOTOR CARRIER ABREV.
W1
MOTOR VEHICLE
Any vehicle, self-propelled or drawn by mechanical
power, designed for operation on the highways or natural terrain in the
transport ion of property or passengers.
MOTOR VEHICLE ACCIDENT
An accident involving a motor vehicle in transport,
but not involving aircraft or watercraft.
MOTOR VEHICLE IN TRANSPORT
A motor vehicle on a roadway or in motion within a
trafficway.
MOTORCYCLE
A two or three wheeled motor vehicle designed to
transport one or two persons, so positioned to straddle a seat.
MOTOR-VEHICLE TRAFFIC ACCIDENT
Any motor vehicle accident that occurs on a
trafficway or that occurs after the motor vehicle runs off the roadway but
before events are stabilized.
MOUSE
A "T" shaped marking tool used by clay
modelers. One end is beveled and pointed; the other end fits into a
two-to-four-foot wooden handle.
MPH
(miles per hour) English unit of velocity.
MRD
Material Required Date
MS
(Material Standards) See (ES-M)
MTS
(Master Timing Schedule) Chrysler corporate-wide
timing schedule for major events leading up to production.
MUCKET
Term used for sealing front door to front body
hinge pillar; tailgate and glass to body back opening pillar.
MUFFLER
Expansion chamber used to muffle the noise of
combustion.
MULTI UNIT ACCIDENT
A traffic accident in which more than two traffic
units are involved in a collision, one with another, but before there is a
stabilized accident situation.
MULTI-PIECE RIM
A rim consisting of more than one part. Usually two
pieces (rim base and side ring), or three pieces (rim base, side ring and lock
ring.)
MULTIPLE FLASH
Two or more photo flashes made in sequence from
different positions to increase the illuminated field in a night
photograph. The camera lens may be
covered or the shutter closed in-between flashes. Commonly called "Painting
with light".
MULTI-STOP BODY
Fully enclosed truck body with driver's compartment
designed for quick, easy entrance and exit.
MUTUAL CRUSH
The total amount of crush distance shared between
two vehicles in a collision. For
example, in an interstate collision the front of one car strikes the side of
another. The front of the striking car
crushes one foot and the side of the struck car crushes two feet. The mutual crush is then three feet so that
the undeformed parts of each car have their velocity changes over a distance of
three feet.
MVMA
Motor Vehicle Manufacturers Association
MVSS
(Motor Vehicle Safety Standard) US Government
standard regulating the safety requirements to which all vehicles sold in the
U.S. must comply.
MY
Model Year
MYTD
Model Year-To-Date
References
Detroit Diesel
Caterpillar User's Manual