Legal Interpretations
Holmes 2014
Summary
The Question
May two pilots log time at the same time in an advanced aviation training device (AATD) that replicates a Boeing 737?
Background
An individual asked general questions about using full flight simulators, flight training devices, and aviation training devices (ATDs) to meet 14 CFR part 61 aeronautical experience requirements, and about two pilots logging time simultaneously in an AATD replicating a Boeing 737.
The FAA’s Interpretation
The FAA declined to decide because it lacked the specific details of the letter of authorization (LOA) issued for the AATD. An ATD approved under 14 CFR 61.4(c) may be used only for the purposes set forth in its LOA, provided that use is not inconsistent with express regulatory requirements; without an LOA, a device may not be used to meet airman certification training requirements.
- Requester
- Holmes
- Issued
- February 20, 2014
- Subjects
- Pilot Certification & Privileges · Air Carrier & Commercial Operations · Flight Simulation Training Devices
Regulations Cited
Page 1
U.S. Deportment
of Tronspor1ation
federal Aviation
Administration
~Es 20· 2014
Kenneth Holmes
Dear Mr. Holmes:
This letter responds to your request for a legal interpretation that was mailed to my office on September 12, 2013. You have asked several general questions seeking clarification regarding the use of full flight simulators (FFS), flight training devices (FTD), and aviation training devices (ATD) to meet aeronautical experience requirements under 14 C.F.R. part 61. You have also asked whether two pilots may log time at the same time in an Advanced Aviation Training Device (AAID) that replicates a Boeing 737.
Currently, 14 C.F.R. part 60 governs the qualification of full flight simulators (FFS) and flight training devices (FTD).1 Before a device may be used as an FFS or FTD for the purpose of meeting regulatory requirements, it must be evaluated and qualified under part 60. FFSs and FTDs approved under part 60 must be sponsored by a person who is certificated under parts 119, 141, or 142. Once a device has been evaluated and qualified under part 60, it may be approved for use to meet regulatory requirements - this approval is usually obtained as part of the FAA~approval process for training programs and courses. In addition to devices approved under part 60, the FAA has approved other devices for use in ainnan certification training wider the authority provided in l 4 C.F.R. § 61.4(c). 2 Since July 2008, the FAA has approved devices in accordance with Advisory Circular 61-136, FAA Approval of Basic Aviation Training Devices (BATD) and Advanced Aviation Training Devices (AATD). In order to credit time in anATD toward aeronautical experience requirements in part 61, the device must first be inspected, qualified, and approved by the FAA. Under the current approval process, the Airman Certification and Training Branch in the General Aviation and Commercial Division of the Flight Standards Service issues a letter of authorization (LOA) to the manufacturer of the device that lists the approved uses. For example, an LOA may approve a device for use toward a portion of the training required for a private pilot certificate under§ 61.109 or to accomplish instrument experience under § 61.57(c). Without an LOA, a device (including AATDs and BATDs) may not be used to meet training requirements for airman certification.
1 Part 60 governs the qualification ofFTDs level 4 through 7. Although the FAA has previously approved devices as FTDs levels l through 3, the FAA does not currently approve FTDs outside of part 60 2 Section 61.4(c) states that the "Administrator may approve a device other than a flight simulator or flight training device for specific purposes."
Page 2
Without knowledge of the specific details oftbe LOA issued for your AATD, we cannot answer your question regarding whether two pilots may log flight time in an AATD that replicates a Boeing 73 7. We note, however, that an ATD may be used only for purposes set forth in the LOA issued by the FAA provided that approved use is not inconsistent with express regulatory requirements.
The FAA notes that, because an LO A permits an ATD to be used to meet flight training requirements that would otherwise be required to be met in aircraft, an authorized instructor for purposes of this training is an appropriately rated flight instructor. While ground instructors may use these devices to enhance a student's understanding of aeronautical knowledge areas, a ground instructor may not train or endorse a student for aeronautical experience requirements for a certificate or rating when training is accomplished in an approved ATD.
This response was prepared by Anne Moore, an attorney in the International Law, Legislation, and Regulations Division of the Office of the Chief Counsel. If you have any additional questions regarding this matter, please contact my office at (202) 267-3073.
Legislation, and Regulations
Regulations Referenced
Snapshot retrieved August 6, 2026.