HONEYWELL ASCa Inc.: Emergency Locator Transmitter - Degraded Performance in High Temperature environment.
- Published
- Effective
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must identify affected Honeywell ELTs by serial number and replace the inductors following the instructions in the applicable Honeywell Service Bulletins. All corrective actions must be completed within 36 months from the AD's effective date of 13 February 2026. Compliance with Canadian Aviation Regulations related to Airworthiness Directives must be maintained.
Summary
EASA Airworthiness Directive CF-2026-05 addresses degraded performance of Honeywell ASCa Inc. Emergency Locator Transmitters (ELTs) RESCU 406AFN2 and RESCU 406SG in high temperature environments. This directive applies to ELTs installed on various aircraft including Boeing 737, 767, 777, 787 series, Airbus A318 through A380 series, and Bombardier BD-500-1A10 and BD-500-1A11 models. The AD mandates corrective actions to ensure ELTs meet Canadian Technical Standard Order requirements for reliable emergency signaling.
What changed
This new Airworthiness Directive introduces mandatory replacement of inductors in affected Honeywell ELTs to restore compliance with performance standards under high temperature conditions. It identifies specific ELT part numbers and serial numbers requiring modification according to Honeywell Service Bulletins issued in 2025. The AD sets a compliance deadline of 36 months from its effective date.
Why it matters
This directive is critical for aviation professionals because ELTs are essential for search and rescue operations, and degraded ELT performance can delay emergency response. Operators and maintenance organizations must ensure affected ELTs are modified to maintain safety and regulatory compliance. Failure to comply could result in unsafe conditions and regulatory penalties.
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