How many simulators does a Part 142 training center need?

There is no fixed FAA ratio of simulators to students under Part 142 — the right number depends on your training volume, device qualification levels (FSTD/FTD/ATD), and maintenance downtime. Add capacity when utilization per device stays consistently high during peak scheduling windows and you're regularly turning away or rescheduling sessions, not based on a one-size-fits-all rule.

There's no FAA-mandated ratio of simulators to students — Part 142 governs how you qualify and maintain your training program, not how many devices you must own. The right number comes from your own utilization data: how many training hours you need to deliver, against how many hours your devices and instructors can actually deliver them, accounting for maintenance and qualification-level mismatches.

Why the answer is what it is

There's no FAA formula — capacity is a business calculation, not a compliance one

Part 142 tells you how to qualify a curriculum, an instructor, and a device (FSTD, FTD, or ATD) — it does not set a students-per-simulator ratio. That means the "right" number of devices is whatever your own throughput math says it is: total training hours you're contracted or expected to deliver, divided by hours each device can realistically deliver after maintenance and instructor availability are subtracted out.

Track utilization per device and per qualification level, not one fleet-wide average

A fixed-base ATD sitting idle while your full-motion FSTD is booked solid looks fine on a blended average and terrible in reality. Break utilization out by device type and qualification level so you can see exactly which slot is the actual bottleneck — usually it's the higher-fidelity device that a stage check or type-rating curriculum requires, not the fleet as a whole.

Watch turned-away demand, not just booked hours

A device that's booked at a moderate share of open hours can still be turning away students if most of the demand clusters in the same few evening slots each week. Track requests you couldn't accommodate — reschedules, waitlist entries, students pushed to a later stage than planned — separately from cancellations, because that number is what actually tells you demand has outgrown supply.

Maintenance windows and instructor availability shrink real capacity below the device count

A simulator isn't available just because it's not booked — recurring maintenance windows, unscheduled downtime, and the pool of check instructors qualified on that specific device all cut into usable hours. Two simulators with one qualified check instructor between them behave like one simulator on your busiest days, so capacity planning has to account for staffing constraints alongside the hardware.

Re-check the math whenever your student mix or client contracts change

Adding a new B2B client account — an airline or Part 141 school sending a cohort through your center — can shift demand onto a specific device or qualification level overnight. Treat capacity as something you revisit every time your enrollment mix changes materially, not a one-time calculation you set and forget.

What to look for

  • Log utilization per device (hours flown/simmed vs. hours available) for at least 60-90 days before adding capacity
  • Track turned-away or rescheduled session requests separately from cancellations — that's your real unmet-demand signal
  • Break down utilization by FSTD/FTD/ATD qualification level, not just a fleet-wide average
  • Model maintenance windows and check-instructor availability as capacity constraints, not just device count
  • Set a utilization threshold that reflects sustained peak-week demand (not a one-time spike) before committing to a new device or bay
  • Separate weekday/evening/weekend demand curves — an averaged number hides peak-hour shortfalls
  • Re-run the capacity math whenever student cohort size or a new client contract changes materially

Related questions

Does the FAA require a minimum number of simulators for a Part 142 training center?

No. Part 142 sets standards for how a training center qualifies its curriculum, instructors, and devices (FSTD/FTD/ATD designations), not a headcount-to-simulator ratio. Capacity is a business decision you make from your own scheduling and utilization data, not a regulatory minimum.

What's a healthy simulator utilization rate before adding a device?

There's no FAA-defined number, and it varies by device mix and peak demand. The practical signal to watch is utilization staying consistently high through peak scheduling weeks alongside a rising rate of turned-away or rescheduled sessions — not a single universal percentage.

Can software tell me when to add a simulator instead of guessing?

Software can't make the capital decision for you, but it can give you the utilization-per-device data to make it with facts instead of a hunch. AviationAlley's simulator scheduling is built to track FSTD, FTD, and ATD device designations, qualification levels, and maintenance windows per booking, with utilization tracked per device so capacity decisions run on data instead of guesswork.

How Roffik addresses this

The platform for FAA-approved Part 142 training centers — simulator scheduling, FAA compliance records, client-account billing, and SWIFT wire reconciliation. Learn more about AviationAlley.

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