Part 135 Recurrent Training: What Gets Reviewed, Checked, and Too Often Overlooked
When was the last time you verified that every pilot on your Part 135 certificate is actually current—not just trained, but current under every applicable recurrent requirement? Part 135 recurrent training spans at least four distinct regulatory elements—ground training, competency check, instrument proficiency check, and line check—each governed by its own rule and its own timing window. The phrase “annual training” does not appear anywhere in Subpart H.
That distinction matters. Part 135 recurrent training requirements define a multi-component compliance system with interdependent obligations, and operators who treat it as “just a checkride” expose themselves to audit failures—not because their pilots lack skill, but because their scheduling, documentation, and subject-coverage tracking breaks down. The requirements for pilots demand more than demonstrated proficiency in a simulator. They demand documented ground training in specific subjects, instrument competency on a tighter cycle, and line-operation validation for every PIC.
This article maps the full regulatory framework behind recurrent pilot training under Part 135, identifies the compliance traps that catch experienced operators, and describes what a well-built recurrent program actually looks like from the inside out.
The Regulatory Framework: Which Rules Govern Part 135 Recurrent Training
Understanding Part 135 recurrent compliance starts with understanding the regulatory architecture. Several CFR sections work together, each controlling a different piece of the recurrent system. 14 CFR §135.323 establishes the foundation: every certificate holder must have an FAA-approved training program. That program governs how training is delivered, structured, and documented—but it cannot reduce below the FAA’s minimum requirements.
The operator’s approved program is the delivery vehicle. The regulations below are the load it must carry.
§135.340 and §135.343: Recurrent Ground and Flight Training
14 CFR §135.340 defines the content requirements for recurrent training. It mandates a knowledge review, instruction as necessary in the subjects required for initial ground training, and recurrent flight training—or an acceptable substitute. These are the what requirements.
14 CFR §135.343 sets the timing: no certificate holder may use a person as a crewmember unless that person has completed the appropriate recurrent training phase since the beginning of the 12th calendar month before that service. This is the when requirement. Two different rules—one governs content, the other governs currency. A satisfactory competency check under §135.293 may substitute for the recurrent flight training component, but the ground training obligation remains independent.
§135.293: The Competency Check
The Part 135 competency check under §135.293 is a demonstrated evaluation, not a written test. It requires a pilot to show proficiency in operational procedures and maneuvers in the appropriate aircraft or approved simulator. Completion of a satisfactory competency check within the preceding 12 calendar months can substitute for recurrent flight training under §135.340—but it does not replace the ground training, IPC, or line check requirements.
§135.297 and §135.299: IPC and Line Check
The PIC instrument proficiency check under §135.297 is required for IFR operations. The regulation specifies a 6-calendar-month interval, making it the most frequently recurring pilot check in the Part 135 system. It evaluates instrument competency and cannot be satisfied by ground training or CBT alone.
The line check under §135.299 applies to PICs and requires observation of at least one flight leg by a check airman. It validates that the PIC can perform competently in the actual operational environment. Both checks carry their own timing windows and documentation requirements, independent of the §135.340/§135.343 recurrent training cycle.
What Gets Reviewed: Required Recurrent Ground Training Subjects
The Part 135 recurrent training requirements for ground instruction are not a blank canvas. Section 135.340 and the operator’s approved training program define specific recurrent ground training subjects that must be covered. These are not optional add-ons or best-practice suggestions. They are regulatory minimums with direct accident-prevention relevance.
Required subjects include, as applicable:
- Low-altitude windshear training — recognition, avoidance, and recovery procedures
- Ground icing awareness training — contamination recognition, deicing/anti-icing procedures, and operational decision-making in icing conditions
- Crew resource management recurrent training — communication, workload management, decision-making, and situational awareness
- Emergency procedures — including evacuation, equipment use, and abnormal-situation management
- Aircraft systems and performance review as required by the operator’s approved program
- Regulatory and procedural updates relevant to the operation
Note that several of these subjects apply conditionally—icing training, for example, is required as applicable to the operator’s environment. The operator’s training program may add subjects tailored to specific aircraft, routes, or operational environments. It cannot omit the core subjects listed above. Training systems should map every recurrent course module to a specific regulation or operator procedure so that instructors—and auditors—can verify that every required topic was covered. If your training records cannot demonstrate subject coverage, the training might as well not have happened.
The 12-Calendar-Month Rule: A Compliance Trap Hiding in Plain Sight
Part 135 recurrent training currency is governed by a calendar month rule, not a rolling 365-day calculation. Under §135.343, a crewmember must have completed the appropriate recurrent training phase since the beginning of the 12th calendar month before the month of service. The distinction is critical and represents one of the most common Part 135 recurrent training scheduling pitfalls in the industry.
Here is how the rule works in practice: A pilot who completes recurrent training on March 15, 2024, is current through the end of March 2025—not through March 15, 2025. A pilot who completes training on March 31, 2024, is also current through the end of March 2025. The completion date within the month does not change the expiration boundary. Currency expires at the end of the 12th calendar month, regardless of the specific day training was completed.
This creates a compliance trap when tracking systems use a rolling anniversary-date approach. A system that flags a pilot as due on March 15, 2025, may not recognize that the pilot is actually current through March 31. Conversely, a system that does not flag the month-end boundary can allow a pilot to fly into April without anyone catching the lapse. Understanding the 14 CFR 135.343 recurrent training currency window is essential for every director of operations and training manager.
The risk extends beyond the training department. Dispatch and scheduling personnel can trigger violations by assigning crewmembers inside an expired window. Calendar-month awareness must be built into scheduling tools and briefed to everyone who assigns crews, not just pilots and training managers.
What Happens If Part 135 Recurrent Training Lapses
A lapsed recurrent training requirement does not simply generate a paperwork discrepancy—it removes the crewmember from legal eligibility for Part 135 operations. Under §135.343, a certificate holder may not use a person as a crewmember after the applicable window closes. That means dispatching a pilot with an expired recurrent training cycle constitutes a regulatory violation regardless of that pilot’s skill level or flight experience.
The practical consequences compound quickly. An FAA ramp inspection or safety audit that uncovers a single lapsed crewmember can trigger a broader records review. Findings can result in civil penalties, certificate actions, and heightened surveillance. Insurance underwriters increasingly scrutinize training compliance records during renewals and incident investigations. A well-documented, current training program is not just a regulatory requirement—it is risk management infrastructure.
Part 135 vs. Part 91: Why the Difference Matters
Operators transitioning from Part 91 to Part 135, or managing mixed-operation fleets, frequently import Part 91 habits into a Part 135 compliance environment. The Part 135 vs Part 91 recurrent training differences are significant enough to create real operational risk if ignored.
Part 91 does not require an FAA-approved training program. It does not mandate specific recurrent ground training subjects, competency checks on defined intervals, or line checks for PICs. Part 135 requires all of these. A pilot who has flown exclusively under Part 91 and transitions to Part 135 operations—even in the same aircraft—enters an entirely different compliance framework. Applying Part 91 standards to Part 135 operations is not a gray area; it is a violation.
What Gets Overlooked: Common Compliance Gaps
The most frequent Part 135 recurrent compliance failures are not failures of pilot skill. They are system failures—gaps in tracking, documentation, or understanding of how the rules interact. Here are the ones that appear most often in audit findings.
Confusing the checkride with the full requirement. The competency check under §135.293 can substitute for recurrent flight training, but it does not satisfy the ground training requirement, the IPC, or the line check. These are separate obligations with separate documentation requirements. Treating the competency check as “recurrent training—done” leaves compliance gaps in at least three other areas.
Assuming online training covers everything. Computer-based training modules are effective for ground knowledge refreshers, regulatory awareness, SOP review, hazard recognition, and CRM reinforcement. They cannot substitute for the competency check, IPC, or line check, all of which require demonstrated proficiency in an approved practical setting. Understanding the Part 135 online recurrent training limitations is essential before building a CBT-only program. An operator whose recurrent program consists only of CBT modules is not compliant.
Applying Part 91 thinking to Part 135 compliance. Part 135 operates under an FAA-approved training program with specific subject-coverage, timing, and documentation requirements. Part 91 does not impose the same structure. Pilots or operators who apply Part 91 standards to Part 135 operations create real operational risk.
Overlooking recurrent training requirements for SIC pilots. Part 135 recurrent training for SIC pilots carries its own obligations under §135.340 and §135.343. SICs require recurrent ground training and a competency check on the same 12-calendar-month cycle as PICs. SICs who do not conduct IFR operations may not need the §135.297 IPC, but the remaining recurrent obligations apply. Treating SIC currency as less important than PIC currency is a compliance gap that auditors consistently identify.
Assuming low-activity pilots stay current. A pilot who flies very little still needs current training and checks to serve in Part 135 operations. Flight experience does not waive the recurring regulatory cycle. If the 12-month window closes, the pilot is not current—regardless of total flight time.
Incomplete training records. Under §135.63, operators must maintain records of each crewmember’s latest tests and training, most recent line check, and current flight experience. These records must be current and available for FAA inspection. An incomplete file is an audit finding even if the training was actually completed. If it is not documented, it did not happen.
Building an Audit-Ready Part 135 Recurrent Training Program
Identifying compliance gaps is only useful if you build systems to prevent them. A well-structured Part 135 recurrent training program treats compliance infrastructure as seriously as training content. Here is what that looks like in practice—effectively a Part 135 recurrent training audit readiness checklist for operators:
- Automated currency alerts tied to the calendar-month rule. Tracking systems must calculate currency using month-end boundaries, not simple anniversary dates. Alerts should fire early enough for scheduling adjustments—not on the day a pilot goes non-current.
- Role-based tracking. PIC, SIC, and cabin crewmember requirements differ. The system must distinguish between them and track the applicable competency check, IPC, line check, and ground training requirements for each role.
- Module-to-regulation mapping. Every CBT course or ground-training session should be traceable to a specific §135 requirement. When an auditor asks how you covered low-altitude windshear or ground icing awareness, you should be able to show the specific module, the regulation it satisfies, and the completion record.
- Integrated documentation. Ground training records, competency check results, IPC records, and line check documentation should live in one system—not scattered across spreadsheets, paper files, and email inboxes.
- Dispatch and scheduling training. Programs should train managers and schedulers, not just pilots. The person who assigns a crew must understand the calendar-month rule well enough to avoid inadvertently dispatching a crewmember inside an expired window.
- Document retention practices that satisfy §135.63. Records must include the latest tests and training, the most recent line check, and current flight experience for each crewmember. Build retention into your workflow, not as an afterthought.
E-learning is well suited for ground knowledge refreshers, regulatory awareness, SOP review, hazard recognition, CRM, and pre-simulator preparation. When that e-learning platform includes built-in tracking, regulation-mapped content, and role-based curricula, it becomes compliance infrastructure—not just a training delivery tool. See how CTS maps Part 135 recurrent ground training modules to specific regulatory requirements.
Frequently Asked Questions About Part 135 Recurrent Training
What is included in Part 135 recurrent training?
Part 135 recurrent training includes recurrent ground training covering required subjects (windshear, icing, CRM, emergency procedures, as applicable), recurrent flight training or its substitute, plus the competency check under §135.293, the instrument proficiency check under §135.297, and the line check under §135.299, as applicable to the crewmember’s role and operational authority.
How often do Part 135 pilots need recurrent training?
Recurrent training must be completed within the preceding 12 calendar months per §135.343. The instrument proficiency check under §135.297 is required on a 6-calendar-month interval for IFR operations, making it the most frequently recurring check in the Part 135 system.
Can a Part 135 competency check substitute for recurrent flight training?
Yes. Under §135.340, a satisfactory Part 135 competency check per §135.293 completed within the preceding 12 calendar months may substitute for the recurrent flight training requirement. It does not substitute for the ground training, IPC, or line check obligations.
What is the difference between a Part 135 competency check and an instrument proficiency check?
The Part 135 competency check under §135.293 evaluates overall operational proficiency in procedures and maneuvers and is required on a 12-calendar-month cycle. The PIC instrument proficiency check under §135.297 specifically evaluates instrument flying competency and is required every 6 calendar months for IFR operations. They serve different regulatory purposes and neither can substitute for the other.
What records must a Part 135 operator keep for recurrent training?
Under §135.63, operators must maintain records of each crewmember’s latest tests and training, most recent line check, and current flight experience. These Part 135 recurrent training recordkeeping requirements mandate that records be current and available for FAA inspection at all times.
Recurrent Training Is a System—Build It Like One
Part 135 recurrent training is a compliance system with interdependent components—ground training, competency checks, instrument proficiency checks, line checks, recordkeeping, and scheduling controls. Each component has its own governing regulation, its own timing window, and its own documentation requirements. The operators who stay compliant year after year are the ones who treat all of these elements as parts of one integrated program, not as isolated tasks to check off a list.
Understanding the full scope of Part 135 recurrent training requirements—from the 12-calendar-month currency rule to role-based tracking for SIC pilots—is the foundation of a defensible compliance program. The operators who stay current are the ones who build their recurrent training around compliance infrastructure: automated tracking, regulation-mapped content, and role-based curricula. That is exactly what a purpose-built Part 135 training platform delivers. Explore CTS’s Part 135 recurrent training courses to see how structured, regulation-mapped e-learning supports your ground training compliance and keeps your crewmembers audit-ready.
