Copyright © KAYLIN 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH NOVEMBER, 2024
Unitized Structural Body Repair Exam
Study Guide Solutions
Unibody - ANSWER✔✔-Lightweight stamped sheet metal components that are welded to each other to
create a single unit.
Space Frame - ANSWER✔✔-Body panels can be made from plastic are steel. Steel may be Mild,
Intermediate, or HSS. Panels may hide damage to frame or structure.
Crush Zones - ANSWER✔✔-Structural components such as rails are designed to collapse and bend at
specific points.
Collision Energy Management - ANSWER✔✔-Goal is passenger protection. Front and rear structures act
as crush-able energy absorbers.
Direct Damage - ANSWER✔✔-POI. Easily located and diagnosed.
Indirect Damage - ANSWER✔✔-transmission of collision energy beyond the area of immediate impact.
Examples; Split seam sealers, pulled spot welds, misaligned panels, buckles in steel, cracked glass, and
cracked or chipped paint.
Passive Restraint Systems - ANSWER✔✔-Must have service manual. No two are alike.
Datum - ANSWER✔✔-Imaginary plane or line beneath the vehicle. Measures height.
Copyright ©Stuvia International BV 2010-2024 Page 1/9
, Copyright © KAYLIN 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH NOVEMBER, 2024
Centerline - ANSWER✔✔-Vertical plane that passes from the front of the vehicle to the rear. Measures
Width. May have stamped marks on vehicle body structure. Is confirmed by referencing at last 3 width
measurements in the undamaged portion of the vehicle.
Zero Planes - ANSWER✔✔-Vertical plane that passes from side to side. Confirmed by measuring 3 length
measurements from the undamaged portion of the vehicle.
Symmetry - ANSWER✔✔-Equal on each side of the vehicle.
Asymmetrical - ANSWER✔✔-Unequal on each side of the vehicle. (spare tire well)
Reference Points - ANSWER✔✔-Bolts or nuts, Holes, Mechanical attachment points, Edges of panels,
Door strikers, Corner of openings. Common tolerance is =/.3mm (1/8) or all the way to 1mm (1.32).
Loaded Measurements - ANSWER✔✔-Drivetrain In
Unloaded Measurements - ANSWER✔✔-Drivetrain out
Point to Point Measurements - ANSWER✔✔-shortest distance between 2 reference points. AKA "as the
crow flies". Uses tram or steel tape measure.
Datum Measurements - ANSWER✔✔-Taken at Datum plane, height differences between reference
points. Laser measuring system
Computerized Measuring System - ANSWER✔✔-compare data stored in a software program or a central
database. Get hard copy of measurements. Can watch while pulling.
Steel - ANSWER✔✔-Cannot know what kind by visible. Must check service manual.
Tensile Strength - ANSWER✔✔-Amount of pressure/force necessary to fracture or tear steel.
Copyright ©Stuvia International BV 2010-2024 Page 2/9
Unitized Structural Body Repair Exam
Study Guide Solutions
Unibody - ANSWER✔✔-Lightweight stamped sheet metal components that are welded to each other to
create a single unit.
Space Frame - ANSWER✔✔-Body panels can be made from plastic are steel. Steel may be Mild,
Intermediate, or HSS. Panels may hide damage to frame or structure.
Crush Zones - ANSWER✔✔-Structural components such as rails are designed to collapse and bend at
specific points.
Collision Energy Management - ANSWER✔✔-Goal is passenger protection. Front and rear structures act
as crush-able energy absorbers.
Direct Damage - ANSWER✔✔-POI. Easily located and diagnosed.
Indirect Damage - ANSWER✔✔-transmission of collision energy beyond the area of immediate impact.
Examples; Split seam sealers, pulled spot welds, misaligned panels, buckles in steel, cracked glass, and
cracked or chipped paint.
Passive Restraint Systems - ANSWER✔✔-Must have service manual. No two are alike.
Datum - ANSWER✔✔-Imaginary plane or line beneath the vehicle. Measures height.
Copyright ©Stuvia International BV 2010-2024 Page 1/9
, Copyright © KAYLIN 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH NOVEMBER, 2024
Centerline - ANSWER✔✔-Vertical plane that passes from the front of the vehicle to the rear. Measures
Width. May have stamped marks on vehicle body structure. Is confirmed by referencing at last 3 width
measurements in the undamaged portion of the vehicle.
Zero Planes - ANSWER✔✔-Vertical plane that passes from side to side. Confirmed by measuring 3 length
measurements from the undamaged portion of the vehicle.
Symmetry - ANSWER✔✔-Equal on each side of the vehicle.
Asymmetrical - ANSWER✔✔-Unequal on each side of the vehicle. (spare tire well)
Reference Points - ANSWER✔✔-Bolts or nuts, Holes, Mechanical attachment points, Edges of panels,
Door strikers, Corner of openings. Common tolerance is =/.3mm (1/8) or all the way to 1mm (1.32).
Loaded Measurements - ANSWER✔✔-Drivetrain In
Unloaded Measurements - ANSWER✔✔-Drivetrain out
Point to Point Measurements - ANSWER✔✔-shortest distance between 2 reference points. AKA "as the
crow flies". Uses tram or steel tape measure.
Datum Measurements - ANSWER✔✔-Taken at Datum plane, height differences between reference
points. Laser measuring system
Computerized Measuring System - ANSWER✔✔-compare data stored in a software program or a central
database. Get hard copy of measurements. Can watch while pulling.
Steel - ANSWER✔✔-Cannot know what kind by visible. Must check service manual.
Tensile Strength - ANSWER✔✔-Amount of pressure/force necessary to fracture or tear steel.
Copyright ©Stuvia International BV 2010-2024 Page 2/9
