Ground Power Unit (GPU) Connection Labels — Aircraft
CARs Part V — Aircraft Electrical System Placards · Federal — Canada
§Source summary
CARs Part V — s.571 Airworthiness — CARs Part V — Aircraft Electrical System Placards
Aircraft external power receptacles should be clearly labelled with voltage, frequency, and polarity requirements. Incorrect GPU connection can cause reverse-current damage to avionics and electrical buses.
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The external power port on your aircraft must show the required voltage (typically 28V DC or 115V AC 400Hz) so ramp crew plug in the right GPU. Wrong voltage destroys avionics.
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Voltage and current rating on GPU receptacle
"28V DC" or "115V AC 400Hz" as applicable
Polarity marking for DC aircraft
"EXTERNAL POWER — CONNECT NEGATIVE LAST" for DC systems
Weatherproof placard — panel mount or door decal
Replace if illegible — GPU overvoltage can total avionics
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Drone Registration Number Decals
📚Sources & Authority
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🏛 Official Government Sources
Canadian Aviation Regulations (CARs) Part II
Justice Laws Canada · March 2026
CARs Part II covers aircraft identification and marking requirements including registration marks, sizing, and placement for Canadian-registered aircraft.
Transport Canada — Aircraft Registration
Transport Canada · March 2026
Official aircraft registration portal. Covers how to register, marking requirements, and the C- prefix system for Canadian aircraft.
RPAS (Drone) Registration — Transport Canada
Transport Canada · March 2026
Drone registration requirements for RPAS between 250g and 25kg. Registration number should be marked on the drone and visible at all times.
All sources are official government publications or recognized industry authorities. Links verified March 2026. If you find a broken link, let us know.
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- Regulation
- CARs Part V — s.571 Airworthiness
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- 🇨🇦 Federal — Canada
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- Aviation Law
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