EASA SIB BEA-2017-03
Embraer EMB-135 and EMB-145 Aeroplanes - Electrical wiring terminations
Summary
The Embraer EMB-135 and EMB-145 Aeroplanes - Electrical wiring terminations Special Airworthiness Bulletin (BEA 2017-03) addresses electrical wiring terminations at the receptacles of Pitot #1, Pitot #2, Pitot #3, TAT #1, and TAT #2 relays on various Embraer EMB-135 and EMB-145 models. It informs owners and operators about inspection recommendations related to potential wiring degradation and heat damage. The bulletin applies to multiple EMB-135 and EMB-145 variants including EMB-145ER, EMB-145EU, EMB-145EP, EMB-145LR, EMB-145MR, EMB-145LU, EMB-135ER, EMB-135BJ, EMB-135LR, EMB-145MP, EMB-145MK, EMB-135KE, EMB-135KL, and EMB-145XR airplanes.
What Changed
This Special Airworthiness Bulletin introduces recommendations to pay special attention to the electrical wiring terminations at specific Pitot and TAT relay receptacles during the General Visual Inspection as specified in the Maintenance Review Board Report task 53-Z223-214-001-A00. It highlights observed issues such as bad contact, heat damage, discoloration, insulation dryness, and cracking that were not previously covered by mandatory Airworthiness Directives. The bulletin supplements previous ANAC Airworthiness Directives by focusing on wiring termination conditions without imposing mandatory compliance.
Why It Matters
This bulletin is important for aviation professionals because it raises awareness of potential electrical wiring issues that could affect flight deck safety due to bad contacts and heat damage. Operators and maintenance teams can proactively identify and correct wiring degradation before it leads to operational problems or safety hazards. It helps ensure continued airworthiness and reliability of critical Pitot and TAT sensor relay systems on Embraer EMB-135 and EMB-145 aircraft.
What To Do
Operators and maintenance personnel should carefully inspect the electrical wiring terminations at the receptacles of Pitot #1 (K0053), Pitot #2 (K0054), Pitot #3 (K0057 and K0058), TAT #1 (K0064), and TAT #2 (K0494) relays during the General Visual Inspection as per MRBR task 53-Z223-214-001-A00 and AMM task 05-20-14-200-801-A. Any signs of heat damage, discoloration, insulation dryness, or cracking must be corrected before returning the airplane to service. There is no mandatory compliance deadline as this bulletin is informative and not an Airworthiness Directive.