
On 1/31/2024, the FAA published a notice of proposed rulemaking (NPRM) on maintenance inspections that applies to manned and unmanned aircraft operating under Part 91.
This would apply to civil operations flying 55 pounds and heavier. It would not apply to public aircraft. It does not apply to Part 107 drone ops.
Multiple Parts are involved. The drone industry is really only interested in the proposed changes to Parts 91, 135, and 137.
Comments are due by April 1, 2024. I have a FAQ section at the bottom.
If you want more alerts like this, make sure you sign up for my drone law newsletter here. If you need waivers or exemptions for exotic drone ops (BVLOS, crop dusting, swarming, over people, etc.), contact me because I help clients obtain these waivers. :) I just recently picked up a BVLOS waiver for over people, over cars, and over 400ft for a Mavic 3, Matrice 300, and Quantum Trinity f90+ without using any parachutes. Contact me.
Table of Contents of Article
Important Quotes in the NPRM
“For unmanned aircraft, including unmanned aircraft operating under 14 CFR part 135 that are authorized to use the inspection rules in part 91, this proposal would enable the selection of either an inspection program recommended by the manufacturer or a program established by the registered owner or operator and approved by the Administrator. The FAA believes this change would enhance safety and would provide unmanned and single-engine turbine-powered aircraft owners and operators with greater flexibility with aircraft maintenance.
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We propose to expand § 91.409(e) to apply to single-engine turbine-powered airplanes and unmanned aircraft. Unmanned aircraft would be required to be inspected in accordance with an inspection program selected under § 91.409(f). Owners and operators of single-engine turbine-powered airplanes would be able to select a § 91.409(f) inspection program or use the inspection provisions of § 91.409(a), (b), (c), or (d).
….
During the unmanned aircraft’s certification process, whether it undergoes a traditional part 21 type certification or a 49 U.S.C. 44807 exemption request,[3] the manufacturer must submit an aircraft inspection program, for FAA approval, that meets certain requirements for life-limited part replacement times specified in the aircraft specifications, type certificate data sheets, or “other documents approved by the Administrator ( i.e.,the sec. 44807 exemption and its associated Conditions & Limitations).” [4] These manufacturer-recommended inspection programs—to include inspection intervals for products and articles—must include the airframe, engines, propellers, rotors, appliances, emergency equipment, etc., which are ultimately approved by the FAA only when they are found to be adequate.
Regarding unmanned aircraft inspection program selection, excluding those operated under part 107, it is necessary for owners and operators to have the ability to select a program that is most appropriate for the design and configuration of their specific aircraft because of the wide variety in aircraft, which cannot be done in the existing regulations. Currently, part 135 unmanned aircraft applicants and approved operators can only use a CAMP, under § 135.411(a)(2), or an approved aircraft inspection program, under §§ 135.411(a)(1) and 135.419, because other inspection program options cannot be selected, as these aircraft are not incorporated in the regulations. The FAA has not approved part 135 unmanned aircraft operators to use an annual or a 100-hour inspection because the FAA has determined the scope and detail criteria [5] contained in these two options do not adequately cover the component characteristics that are typically installed on these aircraft ( e.g., multiple electric motors, circuit boards, batteries, etc.). Additionally, a manufacturer-recommended inspection program—that traditional aircraft may currently select—is not available to unmanned aircraft, despite CAMPs and AAIPs being primarily based on a manufacturer-recommended inspection program. Because of these issues, a CAMP or an AAIP has been the only option for part 135 unmanned aircraft operators to select.
Therefore, the FAA proposes to include unmanned aircraft, excluding part 107 aircraft, in § 91.409(e), which would apply to unmanned aircraft operating under, or otherwise required to be inspected in accordance with, part 91. In particular, the FAA intends for this proposal to apply to unmanned aircraft being operated under part 91 or 135 and that are required to select a maintenance program in accordance with § 91.409(f). While an unmanned aircraft operator would have the option to select a manufacturer-recommended inspection program, they could still continue to use an AAIP or CAMP. This proposal would be applicable to the unmanned aircraft inspections and not unmanned aircraft systems, as defined in 14 CFR 1.1.
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We also propose to revise § 91.409(e) to include unmanned aircraft. Unmanned aircraft owners and operators subject to the regulation would be required to select one of the inspection programs in paragraph (f). This proposed change would incorporate the requirement, in the conditions & limitations section, that has been required in the existing UAS sec. 44807 exemptions [6] for unmanned aircraft inspections using the UAS manufacturer’s inspection program.
We propose to separate § 91.409(e) into two paragraphs to increase clarity and readability, as stated above. Proposed paragraph (e)(1) would cover all current and proposed aircraft that would be required to be inspected in accordance with a § 91.409(f) program ( i.e., large airplanes, multiengine turbine-powered airplanes, and unmanned aircraft). Regarding large airplanes and multiengine turbine-powered airplanes, the proposed rule would not make any changes to the currently available inspection programs. Regarding unmanned aircraft, as previously described, the annual, 100-hour, and progressive inspection options are not viable inspection programs because of the significant differences between unmanned aircraft and traditional manned aircraft for which those provisions were designed. Unmanned aircraft would be included under the new § 91.409(e)(1) because they should comply with time-limited parts replacement and the better-suited inspection programs contained in paragraph (f). Proposed paragraph (e)(2) would cover all current and proposed aircraft that have the option to use the inspection options in paragraph (f) in lieu of the inspection provisions of § 91.409(a), (b), or (d) ( i.e., turbine-powered rotorcraft and single-engine turbine-powered airplanes).”
Proposed Text for Part 91
Bold is what is added or different.
Current |
Proposed |
(a) Except as provided in paragraph (c) of this section, no person may operate an aircraft unless, within the preceding 12 calendar months, it has had— (1) An annual inspection in accordance with part 43 of this chapter and has been approved for return to service by a person authorized by § 43.7 of this chapter; or (2) An inspection for the issuance of an airworthiness certificate in accordance with part 21 of this chapter. No inspection performed under paragraph (b) of this section may be substituted for any inspection required by this paragraph unless it is performed by a person authorized to perform annual inspections and is entered as an “annual” inspection in the required maintenance records. |
(a) Annual inspections. Except as provided in paragraph (c) of this section, no person may operate an aircraft unless, within the preceding 12 calendar months, it has had— (1) An annual inspection in accordance with part 43 of this chapter and has been approved for return to service by a person authorized by § 43.7 of this chapter; or (2) An inspection for the issuance of an airworthiness certificate in accordance with part 21 of this chapter. No inspection performed under paragraph (b) of this section may be substituted for any inspection required by this paragraph unless it is performed by a person authorized to perform annual inspections and is entered as an “annual” inspection in the required maintenance records. |
(b) Except as provided in paragraph (c) of this section, no person may operate an aircraft carrying any person (other than a crewmember) for hire, and no person may give flight instruction for hire in an aircraft which that person provides, unless within the preceding 100 hours of time in service the aircraft has received an annual or 100-hour inspection and been approved for return to service in accordance with part 43 of this chapter or has received an inspection for the issuance of an airworthiness certificate in accordance with part 21 of this chapter. The 100-hour limitation may be exceeded by not more than 10 hours while en route to reach a place where the inspection can be done. The excess time used to reach a place where the inspection can be done must be included in computing the next 100 hours of time in service. | (b) 100 hour inspections. Except as provided in paragraph (c) of this section, no person may operate an aircraft carrying any person (other than a crewmember) for hire, no person may give flight instruction for hire in an aircraft which that person provides, and no person may operate an aircraft over congested areas under part 137 of this chapter unless within the preceding 100 hours of time in service the aircraft has received an annual or 100-hour inspection and been approved for return to service in accordance with part 43 of this chapter or has received an inspection for the issuance of an airworthiness certificate in accordance with part 21 of this chapter. The 100-hour limitation may be exceeded by not more than 10 hours while en route to reach a place where the inspection can be done. The excess time used to reach a place where the inspection can be done must be included in computing the next 100 hours of time in service. |
(c) Paragraphs (a) and (b) of this section do not apply to— (1) An aircraft that carries a special flight permit, a current experimental certificate, or a light-sport or provisional airworthiness certificate; (2) An aircraft inspected in accordance with an approved aircraft inspection program under part 125 or 135 of this chapter and so identified by the registration number in the operations specifications of the certificate holder having the approved inspection program; (3) An aircraft subject to the requirements of paragraph (d) or (e) of this section; or (4) Turbine-powered rotorcraft when the operator elects to inspect that rotorcraft in accordance with paragraph (e) of this section. |
(c) Applicability of annual and 100 hour inspections. Paragraphs (a) and (b) of this section do not apply to— (1) An aircraft authorized by the Administrator to be inspected in accordance with a progressive inspection program under paragraph (d) of this section; (2) An aircraft subject to the requirements of paragraph (e)(1) of this section; or (3) Turbine-powered rotorcraft or single-engine turbine-powered airplanes when the owner or operator elects to inspect that aircraft in accordance with paragraph (e)(2) of this section. |
(d) Progressive inspection….. | Unchanged |
(e)Large airplanes (to which part 125 is not applicable), turbojet multiengine airplanes, turbopropeller-powered multiengine airplanes, and turbine-powered rotorcraft. No person may operate a large airplane, turbojet multiengine airplane, turbopropeller-powered multiengine airplane, or turbine-powered rotorcraft unless the replacement times for life-limited parts specified in the aircraft specifications, type data sheets, or other documents approved by the Administrator are complied with and the airplane or turbine-powered rotorcraft, including the airframe, engines, propellers, rotors, appliances, survival equipment, and emergency equipment, is inspected in accordance with an inspection program selected under the provisions of paragraph (f) of this section, except that, the owner or operator of a turbine-powered rotorcraft may elect to use the inspection provisions of § 91.409(a), (b), (c), or (d) in lieu of an inspection option of § 91.409(f). | (e) Large airplanes (which are not inspected in accordance with part 125 of this chapter), turbine-powered airplanes and rotorcraft, and unmanned aircraft —(1) Large airplanes, multiengine turbine-powered airplanes, and unmanned aircraft. Except as specified in § 91.401, no person may operate a large airplane, multiengine turbine-powered airplane, or unmanned aircraft unless the replacement times for life-limited parts specified in the aircraft specifications, type data sheets, or other documents approved by the Administrator are complied with and the aircraft, including the airframe, engines, propellers, rotors, appliances, survival equipment, and emergency equipment, is inspected in accordance with an inspection program selected under the provisions of paragraph (f) of this section. (2) Turbine-powered rotorcraft and single-engine turbine-powered airplanes. In lieu of paragraph (a), (b), or (d) of this section, the owner or operator of a turbine-powered rotorcraft or a single-engine turbine-powered airplane may elect to use an inspection program selected under the provisions of paragraph (f) of this section. If an alternate inspection program is selected, no person may operate the aircraft unless the replacement times for life-limited parts specified in the aircraft specifications, type data sheets, or other documents approved by the Administrator are complied with and the aircraft, including the airframe, engines, propellers, rotors, appliances, survival equipment, and emergency equipment, is inspected in accordance with the inspection program. |
(f)Selection of inspection program under paragraph (e) of this section. The registered owner or operator of each airplane or turbine-powered rotorcraft described in paragraph (e) of this section must select, identify in the aircraft maintenance records, and use one of the following programs for the inspection of the aircraft: (1) A continuous airworthiness inspection program that is part of a continuous airworthiness maintenance program currently in use by a person holding an air carrier operating certificate or an operating certificate issued under part 121 or 135 of this chapter and operating that make and model aircraft under part 121 of this chapter or operating that make and model under part 135 of this chapter and maintaining it under § 135.411(a)(2) of this chapter. (2) An approved aircraft inspection program approved under § 135.419 of this chapter and currently in use by a person holding an operating certificate issued under part 135 of this chapter. (3) A current inspection program recommended by the manufacturer. (4) Any other inspection program established by the registered owner or operator of that airplane or turbine-powered rotorcraft and approved by the Administrator under paragraph (g) of this section. However, the Administrator may require revision of this inspection program in accordance with the provisions of § 91.415. Each operator shall include in the selected program the name and address of the person responsible for scheduling the inspections required by the program and make a copy of that program available to the person performing inspections on the aircraft and, upon request, to the Administrator. |
(f) Selection of inspection program under paragraph (e) of this section. The registered owner or operator of each aircraft that is required to or has opted to use an inspection program under this section, as described in paragraph (e) of this section, must select, identify in the aircraft maintenance records, and use one of the following programs for the inspection of the aircraft. Each operator shall make a copy of the selected program available to the person performing inspections on the aircraft and, upon request, to the Administrator. (1) An inspection program that is part of a continuous airworthiness maintenance program currently in use by a person holding an air carrier certificate or an operating certificate issued under part 121 or 135 of this chapter and operating that make and model aircraft under part 121 of this chapter or operating that make and model under part 135 of this chapter and maintaining it under § 135.411(a)(2) of this chapter. (2) An approved aircraft inspection program approved under § 135.419 of this chapter and currently in use by a person holding an operating certificate issued under part 135 of this chapter. (3) An inspection program recommended by the manufacturer that was the most current program available at the time of selection and identified in the aircraft maintenance records. (4) Any other inspection program established by the registered owner or operator and approved by the Administrator for that aircraft under paragraph (g) of this section. The Administrator may require revision of this inspection program in accordance with the provisions of § 91.415. Each operator shall include in the selected program the name and address of the person responsible for scheduling the inspections required by the program and make a copy of that program available to the person performing inspections on the aircraft and, upon request, to the Administrator. |
(g) Inspection program approved under paragraph (e) of this section. Each operator of an airplane or turbine-powered rotorcraft desiring to establish or change an approved inspection program under paragraph (f)(4) of this section must submit the program for approval to the responsible Flight Standards office. The program must be in writing and include at least the following information: (1) Instructions and procedures for the conduct of inspections for the particular make and model airplane or turbine-powered rotorcraft, including necessary tests and checks. The instructions and procedures must set forth in detail the parts and areas of the airframe, engines, propellers, rotors, and appliances, including survival and emergency equipment required to be inspected. (2) A schedule for performing the inspections that must be performed under the program expressed in terms of the time in service, calendar time, number of system operations, or any combination of these. |
(g) Inspection program approved under paragraph (e) of this section. Each operator of an aircraft desiring to establish or change an approved inspection program under paragraph (f)(4) of this section must submit the program for approval in a manner acceptable to the FAA. The program must be in writing and include at least the following information: (1) Instructions and procedures for the conduct of inspections for the particular make and model aircraft, including necessary tests and checks. The instructions and procedures must set forth in detail the parts and areas of the airframe, engines, propellers, rotors, and appliances, including survival and emergency equipment required to be inspected. (2) A schedule for performing the inspections that must be performed under the program expressed in terms of the time in service, calendar time, number of system operations, or any combination of these. |
(h) Changes from one inspection program to another. When an operator changes from one inspection program under paragraph (f) of this section to another, the time in service, calendar times, or cycles of operation accumulated under the previous program must be applied in determining inspection due times under the new program. | Unchanged. |
Proposed Text for Part 137
Bold is what is added or different.
Current |
Proposed |
§ 137.53 Operation over congested areas: Pilots and aircraft. (a) General. No person may operate an aircraft over a congested area except in accordance with the pilot and aircraft rules of this section. (b) Pilots. Each pilot in command must have at least— (1) 25 hours of pilot-in-command flight time in the make and basic model of the aircraft, at least 10 hours of which must have been acquired within the preceding 12 calendar months; and (2) 100 hours of flight experience as pilot in command in dispensing agricultural materials or chemicals. (c) Aircraft. (1) Each aircraft must— (i) If it is an aircraft not specified in paragraph (c)(1)(ii) of this section, have had within the preceding 100 hours of time in service a 100-hour or annual inspection by a person authorized by part 65 or 145 of this chapter, or have been inspected under a progressive inspection system; and (ii) If it is a large or turbine-powered multiengine civil airplane of U.S. registry, have been inspected in accordance with the applicable inspection program requirements of § 91.409 of this chapter. (2) If other than a helicopter, it must be equipped with a device capable of jettisoning at least one-half of the aircraft’s maximum authorized load of agricultural material within 45 seconds. If the aircraft is equipped with a device for releasing the tank or hopper as a unit, there must be a means to prevent inadvertent release by the pilot or other crewmember. |
137.53 Operation over congested areas: Pilots and aircraft. (a) General. No person may operate an aircraft over a congested area except in accordance with the pilot and aircraft rules of this section. (b) Pilots. Each pilot in command must have at least— (1) 25 hours of pilot-in-command flight time in the make and basic model of the aircraft, at least 10 hours of which must have been acquired within the preceding 12 calendar months; and (2) 100 hours of flight experience as pilot in command in dispensing agricultural materials or chemicals. (c) Aircraft. Each aircraft, other than a helicopter, must be equipped with a device capable of jettisoning at least one-half of the aircraft’s maximum authorized load of agricultural material within 45 seconds. If the aircraft is equipped with a device for releasing the tank or hopper as a unit, there must be a means to prevent inadvertent release by the pilot or other crewmember. |
FAQs
I’m a civil (non-government) aircraft operator. Does this apply to me?
Only for those operating under Part 91. Examples would be all those flying civil drones 55-pounds and heavier. Some under 55-pound drones with experimental certificates. This does not apply to operations under Part 107.
I’m a public aircraft operator. Does this apply to me?
No, 91.409 is for civil aircraft operators. See 91.401(a), “This subpart prescribes rules governing the maintenance, preventive maintenance, and alterations of U.S.-registered civil aircraft operating within or outside of the United States.”
I’m a Part 107 flyer. Does this apply to me?
No, it’s for Part 91 operations only. 91.1 says, “(f) Except as provided in §§ 107.13, 107.27, 107.47, 107.57, and 107.59 of this chapter, this part [91] does not apply to any aircraft governed by part 107 of this chapter.” You are either Part 91 or Part 107. Period.
You did my exemption. Does this affect my exemption or my operations?
Thanks for hiring me! :) The 55-pound and heavier exemptions I did all obtained 91.409(a)(1) and (2) exemptions.
In addition to that, the proposed regulations say,
“(c) Applicability of annual and 100 hour inspections. Paragraphs (a) and (b) of this section do not apply to—. . . (2) An aircraft subject to the requirements of paragraph (e)(1) of this section[.]” (Emphasis mine).
(e)(1) says, “Except as specified in § 91.401, no person may operate a[n] . . . unmanned aircraft unless the replacement times for life-limited parts specified in the aircraft specifications, type data sheets, or other documents approved by the Administrator are complied with and the aircraft, including the airframe, engines, propellers, rotors, appliances, survival equipment, and emergency equipment, is inspected in accordance with an inspection program selected under the provisions of paragraph (f) of this section.” (Emphasis mine).
You must select one of 4 methods listed in (f) which says, “Selection of inspection program under paragraph (e) of this section. The registered owner or operator of each aircraft that is required to or has opted to use an inspection program under this section, as described in paragraph (e) of this section, must select, identify in the aircraft maintenance records, and use one of the following programs for the inspection of the aircraft. Each operator shall make a copy of the selected program available to the person performing inspections on the aircraft and, upon request, to the Administrator. . . . (3) An inspection program recommended by the manufacturer that was the most current program available at the time of selection and identified in the aircraft maintenance records. (4) Any other inspection program established by the registered owner or operator and approved by the Administrator for that aircraft under paragraph (g) of this section. The Administrator may require revision of this inspection program in accordance with the provisions of § 91.415.”
The 55+ exemptions for Part 137 spraying drones say in condition and limitation 16, “The Operator must follow the UAS manufacturer’s operating limitations, maintenance instructions, service bulletins, overhaul, replacement, inspection, and life-limit requirements for the UAS and UAS components. Each UAS operated under this exemption must comply with all manufacturers’ safety bulletins. Maintenance must be performed by individuals who have been trained by the Operator in proper techniques and procedures for these UAS. All maintenance must be recorded in the UAS records including a brief description of the work performed, date of completion, and the name of the person performing the work.”
You are already complying with this proposed regulation. The FAA explains why, “During the unmanned aircraft’s certification process, whether it undergoes a traditional part 21 type certification or a 49 U.S.C. 44807 exemption request,[3] the manufacturer must submit an aircraft inspection program, for FAA approval, that meets certain requirements for life-limited part replacement times specified in the aircraft specifications, type certificate data sheets, or ‘other documents approved by the Administrator ( i.e., the sec. 44807 exemption and its associated Conditions & Limitations).’[4] These manufacturer-recommended inspection programs—to include inspection intervals for products and articles—must include the airframe, engines, propellers, rotors, appliances, emergency equipment, etc., which are ultimately approved by the FAA only when they are found to be adequate.”
The important thing here is for you all to make sure you are following the manufacturer’s maintenance documents available. The DJI T40 has it actually located in the back of the user manual. Sometimes manufacturers or sellers do NOT provide you these documents. You as the operator should ask for them so you can comply with the exemption and the proposed future regulations. If you are my client, I have maintenance manuals for the DJI T16, T20, T30 and some other aircraft. I can provide them to you if you ask.
In your maintenance records, you should indicate somewhere that you are using the manufacturer’s maintenance manual.
When will this go into effect?
Data shows that it was around 1.5 years after the publishing of the NPRM. That’s a good average of how long it takes to get through the FAA rulemaking process to a final rule.