National Wildfire Coordinating Group

S-231, Engine Boss (Single Resource), 2012

Decorative banner: Four photos of wildland firefighting operations. Three firefighters pull hose to the flatbed of another truck. A firefighter pulls hose from the back of an engine as he walks away. A fire engine drives up a dirt road with a firefighter walking beside and flames in background burn sage. A fire engine drives down a dusty road next to heavy timber.

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Instructor-led Description

This is a skill course designed to produce student proficiency in the performance of the duties associated with Engine Boss, Single Resource (ENGB). Topics include engine and crew capabilities and limitations, information sources, fire size up considerations, tactics, and wildland/urban interface.

Blended Description

This course was developed using a blended approach to learning. Students are required to complete the online training portion of the course and pass an online assessment prior to taking the ILT. The focus of this online training is to teach knowledge and concepts. The ILT will reinforce the content learned online and provide opportunities to apply this knowledge to real-world scenarios and practical exercises. Upon completion of the ILT, students must then take and pass a final assessment in order to receive credit for the course. The final assessment covers content from both the online and ILT portions of the course.


  • Perform the tasks of an Engine Boss in making the tactical decisions required to safely manage an engine on an incident.

Target Group

Personnel desiring to be qualified as Engine Boss, single resource (ENGB).

Prerequisite Qualifications and Training

  • Qualified as a Firefighter Type 1 (FFT1).
  • Successful completion of S-230, Crew Boss (Single Resource) (CRWB) (instructor led or blended delivery).

Session Offerings

Sessions of this course may be available in the NWCG Wildland Fire Learning Portal (WFLP). Enrollment requires an account. Log on as a guest to search for session offerings of this course and to view other public content. To search for a specific course, use the FIND LEARNING menu at the top of the page, then select UPCOMING COURSES. To view Geographic Area training schedules, select the specific GEOGRAPHIC AREA information using the drop-down menu at the top of the page. Contact your local Training Officer for more information about local course sessions.



S-231 is available as either blended training or classroom instructor-led training.

Course Components and Hours to Complete

Component Hours:  Instructor-Led Hours:  Blended
Instructor-led training 12-16 6-10
Pre-course work N/A N/A
Pre-selection assessment N/A N/A
Online Training N/A 6
Recommended Total Hours 12-16 12-16

Course Level


Minimum Instructor Qualifications

Lead instructor must be a qualified Strike Team Leader Engine (STEN) or Task Force Leader (TFLD).

Unit instructors must be qualified as Engine Boss, Single Resource (ENGB).

See NWCG Standards for Course Delivery, PMS 901-1, Instructor Standards for more information.


Certification Date, Instructor-Led:


Previous Certification Dates:

  • 1996-03

Certification Date, Blended:


Previous Certification Dates:



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