Ground Power Unit (GPU) Connection Labels — Aircraft
CARs Part V — Aircraft Electrical System Placards · Federal — Canada
§The Law
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.”
View official regulation text✓Plain English
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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Specific Requirements
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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📚Sources & Authority
Every claim on this page is backed by official government legislation and verified industry sources. Last verified: March 2026.
🏛 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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Shop Aircraft Electrical LabelsOr call (289) 228-7021Regulation Quick Facts
- Regulation
- CARs Part V — s.571 Airworthiness
- Jurisdiction
- 🇨🇦 Federal — Canada
- Category
- Aviation Law
Source library
Confirm the current rule before relying on a marking
Our guides are a starting point for locating government sources connected to CARs Part V — s.571 Airworthiness markings. Requirements can depend on jurisdiction, vehicle or site details, and the date you act.
- Open the linked official source and check its current version.
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Compliance Certificate
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