National Commission for the
Certification of Crane Operators
Committed to Quality, Integrity, and Fairness in Testing since 1995


Mobile Crane Operator

Written Exam - Specialty Exams Outline

The Specialty Examinations for the CCO certification program test the following knowledge areas relating to the operation of each of these types of cranes:

  • Lattice Boom Cranes (LAT)
  • Telescopic Boom Cranes - Swing Cab (TLL)
  • Telescopic Boom Cranes - Fixed Cab (TSS)

Each Specialty Exam only contains questions relevant to cranes within that specialty area. For example, questions about lattice booms will appear on the LAT exams, but they will NOT appear on TLL or TSS exams.

Domain 1: Setup
(Approximately 23% of the test)

Domain 2: Operations
(Approximately 23% of the test)

Domain 3: Technical Knowledge
(Approximately 19% of the test)

Domain 4: Load Charts
(Approximately 35% of the test)


(Approximately 23% of the test)

  1. Know the proper use of supporting materials (e.g., mats, blocking/cribbing)
  2. Know proper boom assembly and disassembly procedures:
  3. a. Lattice booms
    b. Telescopic booms
    c. Extensions/jibs
  4. Know how to properly use:
  5. a. Outriggers/stabilizers
    b. Crawlers
  6. Know how to use outrigger position indicators/sensors.


(Approximately 23% of the test)

  1. Know how to operate a crane:
  2. a. Stationary on rubber tires
    b. On outriggers
    c. Stationary on crawlers
  3. Know how to pick and carry:
  4. a. On rubber
    b. On crawlers
  5. Know how to shut down and secure the crane properly when leaving it unattended:
  6. a. Lattice boom cranes
    b. Telescopic boom cranes
  7. Know the use/function of the following operator aids:
  8. a. Boom length indicators
    b. Boom hoist limiting devices
    c. Luffing jib limiting devices
  9. Know the use/function of the following safety devices:
  10. a. Boom stops
    b. Brake locks
    c. Jib stops
  11. Know power flow systems.
  12. Know the procedures when approaching two-blocking for:
  13. a. Telescopic boom cranes
    b. Lattice boom cranes


(Approximately 19% of the test)

  1. Know basic crane terminology and definitions specific to different crane types.
  2. Know functions and limitations and attachments specific to different crane types.
  3. Know wire rope replacement criteria and inspection procedures (standing ropes)


(Approximately 35% of the test)

  1. Understand different elements of load charts:
  2. a. Apply load chart notes
    b. Specifications
    c. Range diagram
    d. Work area diagram
    e. Boom/jib erection charts
    f. Rated capacity charts
  3. Understand and apply manufacturers’ load charts given various configurations:
  4. a. Determining maximum radius for load placement
    b. Determining gross capacity
    c. Determining net capacity