Part 107 Has No Maintenance Schedule

For most drones, Part 107 does not tell you when to replace propellers, how often to inspect motors or what to write in a maintenance log. It tells you something harder: before every flight, you decide whether the aircraft is in a condition for safe operation, and you stop flying the moment you have reason to think it no longer is.

What does Part 107 require for maintenance?

14 CFR §107.15 has two parts. No one may operate a civil small UAS unless it is in a condition for safe operation, and before each flight the remote pilot in command must check it to decide whether it is. And no one may continue a flight after they know, or have reason to know, that the system is no longer in a condition for safe operation.

That is the requirement. There is no interval, no checklist in the rule and no required logbook for an ordinary Part 107 aircraft.

Are the manufacturer's instructions mandatory?

Not by Part 107 itself. The FAA's Advisory Circular 107-2A, which says it is guidance and does not have the force of law, recommends them. It says that whenever possible the operator should maintain the aircraft and its components according to the manufacturer's instructions, preferably those instructions or, in lieu of that, known industry best practices. It also says the preflight inspection should follow the manufacturer's inspection procedures when available, and/or a procedure the owner or operator develops.

So a manufacturer interval is not a federal deadline. It is evidence. If you fly past it, your §107.15 decision has to rest on something, and "the rule doesn't require it" is not a condition check.

When does Part 107 add real maintenance rules?

In two places:

• Category 4 operations over people. Under §107.140, the aircraft needs an airworthiness certificate, and maintenance, alterations and inspections must follow the manufacturer's current maintenance manual or instructions for continued airworthiness, or other methods acceptable to the FAA, done by someone with the knowledge, skill and equipment.
• Category 2 and 3 aircraft. Their remote pilot operating instructions list the modifications that do not change eligibility. A change outside that list means the aircraft no longer matches what was declared.

The Operations Over People post covers the categories.

What does the preflight check have to include?

§107.49 adds specific items before flight: the control links between the ground station and the aircraft work properly, there is enough power for the intended operational time, and anything attached or carried is secure and does not adversely affect flight characteristics or controllability. The preflight post lists the rest of §107.49.

A worked example

Your manufacturer recommends replacing propellers after a set number of hours, and you are past it. Under Part 107 that is not automatically a violation. Under §107.15 you still have to decide the aircraft is safe, so you inspect the props for chips, cracks and flex. If you see damage, you may not fly. If the flight starts and a motor runs hot or the aircraft drifts in a way it never has, §107.15(b) means you land, because you now have reason to know it may not be safe.

What this means for the exam

Expect questions on who decides airworthiness and when. The answer is the remote pilot in command, before every flight, with a duty to stop if the condition changes. Do not pick answers that cite a mandatory federal inspection interval for an ordinary Part 107 aircraft.

The handbook covers this under UA.V.F.K1 for basic maintenance and UA.V.F.K4 for record keeping.