Performance Skill Standard:

Conditions of Performance:

• Given verbal or written instructions about where and when to leave a trailer, and a trailer of any size attached to a tractor…

Statement of Work to be performed:

• … The driver will demonstrate safe uncoupling of typical tractor-trailer units.

Performance Criteria:

• Driver must uncouple tractor-trailer units within 5-7 minutes in accordance with approved procedures.
• Complete uncoupling in accord with safety requirements and approved practices.
• Secure trailer from movement.
• Follow correct sequence for disconnecting electric lines and air hoses.

Performance Elements and Assessment Criteria:

• Spot trailer on surface capable of supporting weight and secure vehicle against movement.
• Set in-cab air brake controls and trailer brakes.
• Lower gear to raise trailer to correct height and check support.
• Uncouple trailer (disconnect dolly if applicable).
• Disconnect and secure air and electrical units prior to uncoupling.
• Pull tractor partially clear of trailer.
• Secure tractor, check trailer supports and brakes/chocks.
• Pull tractor completely clear of trailer.