Maintenance and Inspections: preflight, batteries, emergencies and flyaways
The short version
- There is almost NO maintenance regulation for sUAS. 107.15 requires the aircraft be in a condition for safe operation; everything else is FAA RECOMMENDATION.
- Follow the MANUFACTURER's maintenance schedule if one exists. Only if none exists do you create your own.
- The aircraft must be inspected BEFORE EACH FLIGHT - that is the exam answer and the regulatory floor.
- Lithium battery thermal runaway needs TWO actions - extinguish the fire, then COOL the cell with water. Never use ice; it insulates and the fire reignites.
- Plan for loss of control link and flyaway before it happens - know exactly what your aircraft does, and that a flyaway you do not report can still be traced to you.
The concepts
What is actually required versus recommended 0:01:41
Maintenance is largely UNREGULATED for sUAS. The only regulatory hook is 107.15, requiring the RPIC to ensure the aircraft is in a condition for safe operation before and during flight.
The maintenance programme comes from the MANUFACTURER, or from you if they provide none.
Most consumer drones (the instructor names DJI) ship with no maintenance programme, so the operator must build one.
The FAA recommends tracking - overhauls, repairs, inspections, modifications, part replacements, and SOFTWARE UPGRADES.
Record keeping and trend analysis 0:02:59
Documenting repairs, modifications, overhauls and replacements so that failure TRENDS become visible before they cause an accident.
Manned aviation keeps separate logbooks per life-limited component - airframe, engine, propeller - with 50-hour, 100-hour and annual inspections. A good model to mirror.
Record component age and time since last repair.
Trend example - propellers degrading around 50 hours means inspecting harder at 45 and replacing at 50, rather than waiting for a failure.
The instructor cites a DJI Inspire TB50/TB55 battery cell weakness as something a recording operator could have caught early.
Log FLIGHT TIME too. No hours requirement exists today, but a future rule might credit it.
That's the idea behind this maintenance program - to find trends so you can fix them before they happen.0:02:59
The preflight inspection 0:05:44
A systematic check of the aircraft, control station and support equipment before EVERY flight.
Visual condition of the airframe - registration marking VISIBLE ON THE EXTERIOR, control surfaces and linkages, powerplants, propellers and rotors.
Control station - antennas, sticks, screen.
Adequate ENERGY for the planned mission - also a 107.49 requirement.
Calibrate the compass ONLY when the manufacturer or the aircraft asks, or after travelling a significant distance.
Verify the control link and video downlink, and that control surfaces respond.
Check the FLIGHT TERMINATION / lost-link behaviour and the RTH altitude.
Confirm any payload is securely attached - a weight-and-balance issue as much as a maintenance one.
GPS - a minimum of FOUR satellites is needed for a 3D position fix; more is better.
Spin up and listen for imbalance or an unusually loud motor.
Do a LOW ALTITUDE hover check for interference, stability and shifting payload before climbing. The instructor lost all signal launching from a rebar-lined parking garage.
Emergency planning 0:12:03
Deciding in advance what you will do, and briefing the crew, before an emergency occurs.
Manned pilots continuously ask "if the engine quit now, where would I go?" - the same habit applies.
Brief the whole crew on emergency procedures as part of the preflight briefing.
Under 107.21 you MAY deviate from any Part 107 rule to the extent required to meet an in-flight emergency, with a written report on FAA request.
Lithium battery thermal runaway 0:13:13
A self-sustaining chemical reaction in which a heated cell ignites and triggers adjacent cells in sequence.
TWO steps are required - EXTINGUISH the flame, then COOL the cells.
Halon extinguishers remove oxygen and stop the flame but do NOT cool - the fire can reignite.
WATER is preferred because it does both.
NEVER use ICE - it acts as an INSULATOR, and the fire reignites beneath it. The instructor cites an FAA test video of a burning laptop doing exactly that.
Do not pick up a smoking or burning battery.
The hoverboard fires of a few years ago are the familiar example of cell-to-cell propagation.
You're not gonna use ice. Ice is going to act as an insulation, and when it does the fire can actually restart.0:13:13
Safe handling and transport of lithium batteries 0:16:25
Damaged, crushed, improperly charged or defective cells present a fire hazard.
Inspect before every flight for BLOATING. A battery that no longer fits its compartment must never be forced in - it is finished.
Do not fly a damaged or bloated battery. Dispose of it per local regulations.
AIR TRAVEL - spare lithium batteries must go in CARRY-ON, never checked baggage, because a thermal runaway in the cargo hold cannot be fought. This has brought aircraft down.
Loss of control link and flyaways 0:17:46
Losing the radio link between control station and aircraft, and the uncommanded departure of the aircraft from controlled flight.
Most sUAS use 2.4 GHz and 5.8 GHz - the same bands as consumer Wi-Fi, so interference is common.
The link is essentially LINE OF SIGHT; obstacles between you and the aircraft degrade it.
Know exactly what YOUR aircraft does on lost link - hover, return to home, land, or cut the motors. Some aircraft have no RTH at all.
If it does RTH, is the set altitude above every obstacle on the return path?
A flyaway is reportable in substance - the instructor cites a Las Vegas operator whose drone landed on airport property, was traced by the FAA, and drew a five-figure fine after he said nothing.
Plan specifically for a flyaway that occurs inside controlled airspace you were authorized to use.
Every concept, three clicks deep
The same concepts as a quick reference: the closed row is the glance, open is the study card, and every timestamp jumps into the recording.
01What is actually required versus recommendedMaintenance is largely UNREGULATED for sUAS.0:01:41›
Maintenance is largely UNREGULATED for sUAS. The only regulatory hook is 107.15, requiring the RPIC to ensure the aircraft is in a condition for safe operation before and during flight.
The maintenance programme comes from the MANUFACTURER, or from you if they provide none.
Most consumer drones (the instructor names DJI) ship with no maintenance programme, so the operator must build one.
The FAA recommends tracking - overhauls, repairs, inspections, modifications, part replacements, and SOFTWARE UPGRADES.
02Record keeping and trend analysisDocumenting repairs, modifications, overhauls and replacements so that failure TRENDS become visible before…0:02:59›
Documenting repairs, modifications, overhauls and replacements so that failure TRENDS become visible before they cause an accident.
Manned aviation keeps separate logbooks per life-limited component - airframe, engine, propeller - with 50-hour, 100-hour and annual inspections. A good model to mirror.
Record component age and time since last repair.
Trend example - propellers degrading around 50 hours means inspecting harder at 45 and replacing at 50, rather than waiting for a failure.
The instructor cites a DJI Inspire TB50/TB55 battery cell weakness as something a recording operator could have caught early.
Log FLIGHT TIME too. No hours requirement exists today, but a future rule might credit it.
03The preflight inspectionA systematic check of the aircraft, control station and support equipment before EVERY flight.0:05:44›
A systematic check of the aircraft, control station and support equipment before EVERY flight.
Visual condition of the airframe - registration marking VISIBLE ON THE EXTERIOR, control surfaces and linkages, powerplants, propellers and rotors.
Control station - antennas, sticks, screen.
Adequate ENERGY for the planned mission - also a 107.49 requirement.
Calibrate the compass ONLY when the manufacturer or the aircraft asks, or after travelling a significant distance.
Verify the control link and video downlink, and that control surfaces respond.
Check the FLIGHT TERMINATION / lost-link behaviour and the RTH altitude.
Confirm any payload is securely attached - a weight-and-balance issue as much as a maintenance one.
GPS - a minimum of FOUR satellites is needed for a 3D position fix; more is better.
Spin up and listen for imbalance or an unusually loud motor.
Do a LOW ALTITUDE hover check for interference, stability and shifting payload before climbing. The instructor lost all signal launching from a rebar-lined parking garage.
04Emergency planningDeciding in advance what you will do, and briefing the crew, before an emergency occurs.0:12:03›
Deciding in advance what you will do, and briefing the crew, before an emergency occurs.
Manned pilots continuously ask "if the engine quit now, where would I go?" - the same habit applies.
Brief the whole crew on emergency procedures as part of the preflight briefing.
Under 107.21 you MAY deviate from any Part 107 rule to the extent required to meet an in-flight emergency, with a written report on FAA request.
05Lithium battery thermal runawayA self-sustaining chemical reaction in which a heated cell ignites and triggers adjacent cells in sequence.0:13:13›
A self-sustaining chemical reaction in which a heated cell ignites and triggers adjacent cells in sequence.
TWO steps are required - EXTINGUISH the flame, then COOL the cells.
Halon extinguishers remove oxygen and stop the flame but do NOT cool - the fire can reignite.
WATER is preferred because it does both.
NEVER use ICE - it acts as an INSULATOR, and the fire reignites beneath it. The instructor cites an FAA test video of a burning laptop doing exactly that.
Do not pick up a smoking or burning battery.
The hoverboard fires of a few years ago are the familiar example of cell-to-cell propagation.
06Safe handling and transport of lithium batteriesDamaged, crushed, improperly charged or defective cells present a fire hazard.0:16:25›
Damaged, crushed, improperly charged or defective cells present a fire hazard.
Inspect before every flight for BLOATING. A battery that no longer fits its compartment must never be forced in - it is finished.
Do not fly a damaged or bloated battery. Dispose of it per local regulations.
AIR TRAVEL - spare lithium batteries must go in CARRY-ON, never checked baggage, because a thermal runaway in the cargo hold cannot be fought. This has brought aircraft down.
07Loss of control link and flyawaysLosing the radio link between control station and aircraft, and the uncommanded departure of the aircraft f…0:17:46›
Losing the radio link between control station and aircraft, and the uncommanded departure of the aircraft from controlled flight.
Most sUAS use 2.4 GHz and 5.8 GHz - the same bands as consumer Wi-Fi, so interference is common.
The link is essentially LINE OF SIGHT; obstacles between you and the aircraft degrade it.
Know exactly what YOUR aircraft does on lost link - hover, return to home, land, or cut the motors. Some aircraft have no RTH at all.
If it does RTH, is the set altitude above every obstacle on the return path?
A flyaway is reportable in substance - the instructor cites a Las Vegas operator whose drone landed on airport property, was traced by the FAA, and drew a five-figure fine after he said nothing.
Plan specifically for a flyaway that occurs inside controlled airspace you were authorized to use.
Tools referenced
| Tool | Coverage | Moment | Context |
|---|---|---|---|
| Advisory Circular 107-2, chapter 7 and appendix C | mentioned | 0:00:00 | The FAA's maintenance and preflight recommendations, including best practices. |
| FAA Order 8130.34 (referenced as "91 30.34D") | mentioned | 0:00:00 | Deep reference on airworthiness certification for UAS; the instructor calls it overkill for most operators. |
| FAA-H-8083-22 Remote Pilot Study Guide, chapter 12 and appendix C | mentioned | 0:00:00 | |
| Manufacturer manual and maintenance schedule | mentioned | 0:00:00 | The FIRST place to look, and the answer to the exam question. |
Session materials
Archived locally on V: — click to open. Companion pages link to the LMS.
Action items
Resources mentioned
- docAudio review - Physiological Factors (MP3, adjacent chapter) 1:00:59
Extraction notes
This page was built from an auto-generated transcript, which garbles product and people's names. Those were corrected silently in everything above and logged here for transparency. The warnings flag claims that were true on the recording day but change fast.
Transcript corrections applied
| The transcript says | The trainer actually means |
|---|---|
| FA / EFA | FAA |
| p-hack | PHAK (Pilot's Handbook of Aeronautical Knowledge) |
| 91 30 Point 34 Delta | an FAA Order number, most likely 8130.34D - verify before citing |
| fixed swing | fixed wing |
| insolent | insulant / insulator |
| US propellers | the UAS propellers |
| they have to be in check baggage ... I'm sorry, they cannot be | self-corrected in the lecture - spare lithium batteries must be in CARRY-ON |
| IACRA | correct - the FAA's Integrated Airman Certification and Rating Application |
| 2.4 is usually designed to transmit your photo ... and 5.8 is going to be used to control | the instructor states this then immediately notes it is "not always 100% true"; band usage varies by manufacturer and is often the reverse |
True on recording day — verify before relying
- 2.4 GHz carries video and 5.8 GHz carries control. - STATUS: UNRELIABLE AS STATED, and the instructor hedges it himself. Band assignment varies by manufacturer and model; check your own aircraft's documentation.
- DJI drones have no maintenance programme. - STATUS: POINT-IN-TIME. Manufacturer support has evolved; check current documentation.
- DJI TB50/TB55 battery cell issue. - STATUS: HISTORICAL example, resolved by firmware/hardware updates at the time.
- No flight-hour requirement exists for remote pilots. - STATUS: CURRENT as taught. The instructor speculates one may appear; verify against current rules.
- FAA Order "91 30.34D" reference. - STATUS: PROBABLY GARBLED. Verify the order number before relying on it.