MTOW stands for Maximum Take-Off Weight. In the context of Australian drone regulation, it refers to the maximum certified weight of an aircraft at the moment of take-off, including the airframe, battery or fuel, payload, and any attached equipment. MTOW is a critical regulatory threshold used by the Civil Aviation Safety Authority (CASA) to determine which rules and requirements apply to a drone operation.
Why MTOW Matters in Australia #
Australian drone regulations under Part 101 of the Civil Aviation Safety Regulations (CASR) use MTOW as the primary weight-based trigger for different levels of regulatory obligation. Understanding where your aircraft sits relative to these thresholds is essential for determining your legal obligations as an operator or remote pilot.
Key MTOW Thresholds Under Australian Law #
Under 250 grams
Drones with an MTOW below 250 grams are subject to the fewest restrictions. While standard safety rules still apply (e.g. not flying over people, not flying near aerodromes without authorisation), operators of sub-250g aircraft are generally not required to hold a Remote Pilot Licence (RePL) or Remote Operator’s Certificate (ReOC) for commercial operations under the Excluded Category provisions — subject to meeting all other standard operating conditions.
250 grams to 2 kilograms
Drones in this weight range are commonly used for recreational and commercial purposes. Sub-2kg aircraft can be operated commercially under the Excluded Category framework without a ReOC or RePL, provided all standard operating conditions are met. These conditions include maintaining VLOS, flying below 120 m AGL, staying 30 m from people not directly associated with the operation, and not flying over populated areas or at night.
2 kilograms and above
Once an aircraft’s MTOW reaches or exceeds 2 kg, commercial operations are no longer permitted under the Excluded Category. Operators must either:
- Hold a Remote Operator’s Certificate (ReOC) issued by CASA, and ensure pilots hold a Remote Pilot Licence (RePL); or
- Obtain specific CASA approval for the proposed operation under the Certified Category.
The 2 kg threshold is one of the most significant regulatory boundaries in Australian drone law for commercial operators.
25 kilograms and above
Aircraft with an MTOW of 25 kg or more are subject to additional CASA requirements and typically fall under more complex certification and airworthiness frameworks.
How MTOW is Calculated #
MTOW includes the total weight of the aircraft ready for flight:
- Airframe and motors
- Battery (fully charged) or fuel (full tank)
- All permanently or temporarily attached equipment (cameras, gimbals, sensors, spray systems)
- Any payload being carried
It is important to note that MTOW is the maximum certified weight — not just the typical operating weight. If a drone is capable of carrying additional payload that would push it over a regulatory threshold, operators should assess compliance based on the aircraft’s maximum rated capacity.
Practical Implications for Operators #
Before commencing any drone operation, operators should:
- Confirm the MTOW of their aircraft as stated in the manufacturer’s specifications.
- Identify which regulatory category applies based on MTOW and the nature of the operation (recreational or commercial).
- Ensure any payload additions do not inadvertently push the aircraft into a higher regulatory category.
- Check whether insurance requirements or site-specific conditions impose additional MTOW-based restrictions.
MTOW vs Actual Operating Weight #
MTOW should not be confused with the actual weight of the aircraft on a given flight. A drone may regularly fly at a weight well below its MTOW, but regulatory categorisation is always determined by the maximum certified weight, not the weight on a specific flight.
Always verify current regulations and requirements directly with CASA at www.casa.gov.au/drones. Regulations are subject to change.