Aviation Training Devices in Flight School Training: BATDs, AATDs, and What Counts Under 14 CFR 61

An instrument student is scheduled for a Saturday morning IPC because their six-month currency window ran out on Tuesday. Weather is 500 overcast with a mile of visibility, well below any approach the school teaches primaries in. The school owns an approved AATD sitting untouched in the ground-school room because the previous chief instructor was unclear on whether ATD approaches counted toward 61.57(c) and nobody replaced the guidance when he left. The student loses the slot, the CFII loses the pay, and the airplane that would have flown the IPC in the afternoon slot goes back on the line without an instrument student on it that day.

That is a self-inflicted wound. An aviation training device the school already owns is one of the cheapest hours in the building, and the FAA has been explicit for more than a decade about which ATD hours count for what. The regulation is not the confusing part. Managing the paperwork so the credit is defensible is.

What 14 CFR 61.4 Actually Recognizes

Under 14 CFR 61.4, the FAA recognizes three categories of ground-based training equipment: full flight simulators, flight training devices, and aviation training devices. Full flight simulators (FFS) and flight training devices (FTD) are Level A through D machines that most primary flight schools will never touch. The category that matters to a training operation with a Cessna and Piper fleet is the ATD, and inside the ATD category the FAA recognizes basic aviation training devices (BATD) and advanced aviation training devices (AATD).

The distinction is not marketing. An ATD is approved by the FAA at the individual unit level under a letter of authorization (LOA), typically issued to the manufacturer under AC 61-136. The LOA specifies whether the device is a BATD or an AATD and lists the credits the FAA has authorized for training and currency. A device sold as "FAA-approved" without a current LOA on file is not an approved ATD, and the hours a student flies on it do not count toward anything the FAA cares about. The first item on every ATD file at a flight school should be a copy of the current LOA, kept where the chief instructor and any DPE can find it.

Credits Toward Part 61 Certificates and Ratings

The credit limits are unglamorous but concrete. For a private pilot certificate under 61.109(k)(1), an applicant may credit up to 2.5 hours of training in an ATD toward the aeronautical experience requirement. For an instrument rating under 61.65(i), an applicant may credit up to 20 hours of instrument time in an ATD if the training was accomplished under an authorized instructor, or up to 10 hours in a BATD. For a commercial certificate under 61.129(i), the limit is 50 hours in an FFS, FTD, or ATD if the training is accomplished as part of an approved Part 142 or Part 141 course, and lower limits outside those courses.

Those are the hard caps. A private applicant showing up to the checkride with 8 hours of ATD time logged as dual and expecting it to count toward the 40-hour minimum will be over on 5.5 of them. A dispatcher who books ATD sessions for an instrument student without tracking against the 20-hour cap ends up with a student who has logged 26 hours of ATD instrument time and still needs 40 hours of real instrument time to sit for the checkride. The device stops being cheap the moment the school miscounts the hours.

Logging Under 61.51(g)

The mechanics of logging come from 14 CFR 61.51(g). Time in an FFS, FTD, or ATD may be logged as instrument time if the pilot performs the required tasks under the direction of an authorized instructor. The logbook entry needs the date, the total time, the type of device (BATD, AATD, FTD Level x, FFS Level x by convention), the location or serial number of the device, and the content of the training. The instructor signs the entry the same way they would sign a dual entry.

An ATD session that is not signed by an authorized instructor is not creditable. A student who flies the AATD unsupervised for an hour has logged an hour of practice time that is worthless for any Part 61 requirement. Some schools solve this by requiring every ATD session to be booked against a specific CFII or CFI slot in the same scheduling flow as an airplane. The dispatcher who releases the keys to N-number 123 and the dispatcher who unlocks the ATD room should be running the same booking discipline. A dispatcher who cannot see the ATD on the same calendar as the airplanes has no way to enforce this discipline.

Instrument Currency and the IPC

The instrument currency provisions in 61.57(c) are where an ATD earns most of its keep in a busy school. A pilot may accomplish the six instrument approaches, holding, and course intercepting and tracking required for currency in an approved ATD, provided the tasks meet the standards of the applicable approach and the ATD is used per its LOA. Under current guidance the ATD approaches count without a safety pilot, which is the operational advantage over performing the same approaches under the hood in the airplane. The same rules cover the six-month grace period in 61.57(d), so a lapsed pilot can restore currency in the ATD before the 12-month IPC deadline hits.

An instrument proficiency check can also be accomplished largely in an approved ATD, with the portions that require the aircraft flown after the ATD portion. Schools that own an AATD and treat the IPC as an all-or-nothing airplane flight are turning down a straightforward operational win. The weather day the IPC would have been canceled on is exactly the day the ATD covers the majority of the tasks and the airplane flight is a shorter follow-up when conditions improve. That interaction with flight currency requirements is where the device pays back its purchase price.

Part 141 Course Approval

A Part 141 school that wants to credit ATD time inside its approved training course outline (TCO) has to have the ATD written into the TCO. The credits available under Part 141 are set in the appendices to Part 141, not in Part 61, and the limits are different. A 141 instrument course can credit substantially more ATD time than the 61.65(i) ceiling, but only if the TCO includes the device and the FSDO has signed off. Using an ATD in a 141 syllabus without the TCO approval is a paperwork problem that surfaces at the next Part 141 audit and undoes the credit retroactively. The Part 61 versus Part 141 distinction matters here because the two systems treat the same physical device under different credit rules, and the school has to know which one it is billing hours against.

Where Schools Waste the Asset

The recurring failure modes are process ones. The device is booked ad-hoc when weather cancels a flight, so utilization is uneven and no student is ever built into a syllabus that assumes ATD hours. The logbook entries are inconsistent, so an FAA inspector or DPE reviewing the record cannot tell whether an entry represents creditable time. The LOA sits in a filing cabinet nobody has opened in eighteen months, and the device is still being used against credits that changed in a revision the school never read.

The fix is calibration, not new equipment. Put the ATD on the same schedule as the airplanes with the same booking discipline. Standardize the logbook entry template across the CFI staff so every instructor signs an ATD session the same way. Track the ATD hours logged per student against the 61.109(k), 61.65(i), and 61.129(i) caps as the student progresses, not on the day of the checkride. And keep the LOA current, printed, and cross-referenced against the credits the school is claiming.

A device that runs on this discipline is one of the cheapest instructional hours in aviation. A device that does not is a piece of furniture that occasionally gets used on a rainy Tuesday. The regulation is the same either way. What changes is whether the school treats the ATD as a scheduled asset with a paper trail or as an optional room down the hall.