Sr2 Ece R66 Bus | Skin

🔹 – Not to be confused with UN ECE regulations for vehicles. In aircraft wiring/electrical bonding, ECE may stand for “Equipment Chassis Earth” or “Electrical Common Earth” in certain manufacturer wiring diagrams (especially older European designs).

In EASA Part-66 aviation maintenance engineering, the term typically refers to a specific structural or electrical bonding concept found on certain aircraft types—most notably related to the ATR 42/72 or Saab 340 (depending on maintenance manual context). Let’s break it down:

Here’s an informative post tailored for aviation maintenance technicians, engineers, or EASA Part-66 students:

🔹 – Often a zone or structural reference code in an Aircraft Maintenance Manual (AMM) or Structural Repair Manual (SRM). In some ATR documentation, SR2 can indicate a fuselage section or a particular longeron/frame station.