Who needs FAR 135.331 training?

For business aviation operators, the question is not only about who sits in the cockpit or cabin. It is about who has assigned safety duties, what type of operation is being conducted, and how the operator is approved to conduct that operation. The short answer is that FAR 135.331 generally applies to crewmembers and certain personnel who support crew qualification, checking, and instruction within Part 135 operations.
The details matter. Applicability can depend on the aircraft, seating configuration, duty assignments, and the specific manuals and approvals tied to an operator. That is why Aircare International encourages operators to treat this as a compliance and safety planning question, not a quick yes or no exercise.

Understanding 135.331
FAR 135.331 sits within the crew qualification framework for a certificate holder operating under Part 135. In practical terms, it addresses the categories of people who must be prepared to perform assigned safety related duties before serving in those roles.
This includes more than just pilots in many cases. If a person is assigned responsibilities that affect passenger safety, crew coordination, emergency response, or operational readiness, they may fall within the scope of the rule. The requirement can also extend to personnel who instruct or evaluate others, depending on the role they serve for the operator.

For many organizations, the central issue is not whether safety preparation is a good idea. It is whether the right people are covered, whether the content matches their assigned duties, and whether records support compliance during oversight or audit activity.

What the eCFR says
The eCFR presents the federal aviation rules in their current published form, but applying those rules to a specific operation often takes professional interpretation. A company may operate different aircraft types, use different crew complements, or assign cabin duties in different ways. Those variations can affect who is required to complete a given program.

In general, operators should look closely at all crewmembers, including pilots and any flight attendant used in the operation. They should also review whether a check pilot, flight instructor, or person conducting flight checks has responsibilities that bring them into the applicable qualification structure.
This is where many operators benefit from expert guidance. Reading the rule is one thing. Mapping it correctly to a real operation, with the right procedures and documentation, is another.

Initial expectations
A new hire, a person moving into a new duty position, or someone joining a new type of operation may need initial training before serving. That preparation should align with the duties the person will actually perform, not with a generic idea of what a crew role might involve.
For example, pilot training may focus on operational duties, crew coordination, and safety responsibilities. A cabin focused role may require emphasis on passenger management, evacuation readiness, use of safety equipment, and emergency training. If the operator uses an aircraft with a specific cabin layout or passenger service model, the content should reflect that environment.
Some organizations assume that prior experience automatically satisfies the need. Experience is valuable, but it does not always replace the need for operator specific preparation. The FAA and other oversight entities often look for evidence that the individual was prepared under the operator program, for the assigned role, and within the proper timeframe.

Recurrent training matters
Compliance is not a one time event. Recurrent training helps ensure that crewmembers remain ready, current, and confident when procedures must be performed under pressure. It also gives operators an opportunity to address changes in aircraft equipment, company procedures, passenger profiles, medical response expectations, and regulatory focus.

Transition training may also apply when a person changes aircraft type, duty position, or operational environment. Likewise, crewmember training should be reviewed whenever the operator changes its manuals, expands services, or modifies safety related assignments.

The safest approach is to avoid assumptions. If a role touches passenger safety, crew coordination, instruction, checking, or emergency response, the operator should review the training requirements before assigning that person to duty.

Aircare International support
Aircare International helps aviation organizations strengthen both compliance confidence and real world crew readiness. The company understands that Part 135 operations are not identical. A private charter operator, an air ambulance provider, and a corporate style operation may all face different risk profiles and crew responsibilities.

Aircare International supports operators with programs designed for practical application, not box checking. Services can help crews prepare for cabin emergencies, medical events, evacuation scenarios, smoke events, decompression concerns, and other situations where calm and capable action matters.

The goal is not to replace the operator responsibility for compliance decisions. The goal is to help operators ask the right questions, prepare the right people, and maintain a defensible safety culture. For many clients, that means pairing regulatory awareness with hands on instruction, realistic scenarios, and documentation support that fits the operation.

If your organization is asking who must be covered under FAR 135.331, the best next step is a review of your operation, crew roles, aircraft use, and approved procedures. Aircare International can help you identify where safety preparation may be needed and how to build a program that supports both compliance and crew confidence.