UA.V.F.K1: Basic maintenance.

ACS Area V — Operations Task F: Maintenance and Inspection Procedures References: A-7

Key Concepts

Before every flight, the remote PIC must determine the small UAS is in a condition for safe operation. This is an explicit duty tied to §107.15 and is the starting point for maintenance and inspection on the exam and in practice.^[3]
Conduct a preflight inspection prior to each flight to verify no equipment damage or malfunctions. Perform this in accordance with the manufacturer’s inspection procedures (owner’s/maintenance manual) or an operator-developed procedure when manufacturer procedures are unavailable.^[4]
Building your own inspection program is encouraged. An operator may create an inspection program tailored to the specific sUAS, leveraging industry programs for details. Keep the program scalable so the preflight check remains appropriate for the aircraft and operation.^[4]
Practical takeaway: Arrive with a checklist that covers structure, propulsion, control links, batteries/power, payload mounting, firmware/software status, and any mission-specific items. Do not launch until discrepancies are corrected and the aircraft is in a safe condition.

Maintenance includes both scheduled and unscheduled overhaul, repair, inspection, modification, replacement, and system software upgrades necessary for flight. Whenever possible, maintain the aircraft and components per the manufacturer’s instructions; if a program is not provided, the operator may develop one and should consider the benefits of recordkeeping.^[3]
For scheduled maintenance, manufacturers may set time-in-service limits (e.g., flight hours, cycles, calendar days) for components and recommend periodic replacement. Adhering to the recommended schedule supports safe, long service life for the sUAS. If the manufacturer does not provide scheduled maintenance instructions, the operator should establish a scheduled maintenance program.^[3]
If not using the manufacturer or recommended personnel, consider maintenance personnel who are familiar with the specific sUAS and its components. If a component cannot be returned to safe operational specification by repair/overhaul, replace it with one that is in a condition for safe operation. Complete required maintenance before each flight, preferably per manufacturer instructions or, if unavailable, recognized industry best practices.^[4]
Practical takeaway: Treat firmware updates as maintenance; track part life limits; keep logs of work performed; and when in doubt about repair quality, replace with airworthy components before flight.

Category 2 eligibility requires the aircraft be designed/produced/modified so that on impact it will not cause injury equivalent to or greater than 11 foot-pounds of kinetic energy, has no exposed rotating parts that would lacerate human skin, and contains no safety defects.^[5]
For Category 2, the applicant must: display a label in English indicating eligibility for Category 2, ensuring it is legible, prominent, and permanently affixed; and provide remote pilot operating instructions addressing at least (i) system description with required components, limitations, and declared category(ies), (ii) allowable modifications that do not change eligibility, and (iii) how to verify and change modes/configurations.^[5]
If a Category 2 or Category 3 label is damaged, destroyed, or missing, the remote PIC must label the aircraft in English so the label is legible, prominent, and will remain on the aircraft for the duration of the operation—before conducting operations over human beings. The label must correctly identify the category(ies) of operation over people the aircraft is qualified to conduct.^[1]
Practical takeaway: For ops over people, verify the aircraft’s category eligibility, confirm the correct, permanent label is present (or re-label as required), and follow the provided operating instructions and limitations.

Category 4 requires using an eligible sUAS that has an airworthiness certificate issued under part 21 and operating strictly within the aircraft’s approved Flight Manual limitations or other Administrator-specified limitations. The limitations must not prohibit operations over people. The remote PIC must comply with those limitations during the operation.^[2]
Maintenance for Category 4 must preserve continued airworthiness and meet reliability acceptable for flight over people. Maintenance, preventive maintenance, alterations, and inspections must use the manufacturer’s current maintenance manual or Instructions for Continued Airworthiness (ICA), or other methods acceptable to the Administrator. Inspections follow the manufacturer’s instructions (or other acceptable instructions), and parts used must be of such quality that the aircraft’s condition remains airworthy. The airworthiness certificate allows small unmanned aircraft operations for compensation and hire.^[6]
Practical takeaway: Treat a Category 4 sUAS like a certificated aircraft: follow the Flight Manual limitations, use approved/acceptable maintenance methods and quality parts, and document maintenance/inspections to demonstrate continued airworthiness.

When a UAS operates under a special airworthiness certificate or COA, operations must comply with all applicable regulations and any special provisions in the COA or the operating limitations of the special airworthiness certificate. Expect coordination with ATC and NOTAMs in many such approvals.^[7]
Practical takeaway: Maintenance supports compliance—ensure the aircraft configuration matches any operating limitations tied to the certificate/COA before flight.

Practice up to 10 questions specifically targeting UA.V.F.K1.