AMC1 ACNS.E.LAD.170 Transmission of a homing signal
ED
Decision 2021/008/R
ACCEPTABLE MEANS OF COMPLIANCE APPLICABLE TO ALL SOLUTIONS
(a) The 121.5-MHz homing-signal transmitter should meet the specifications of EUROCAE ED-62B (including Change 1) that are applicable to:
(1) an automatic ELT with capabilities C (crash survivability) and H1 (121.5-MHz homing signal) and of class 0 or 1; or
(2) an ELT(DT) with capability C and H1, and of class 0 or 1,
except for specifications related to the transmission of the 406-MHz signal, to COSPAS-SARSAT requirements, to ELT controls, or the ELT monitoring system.
(b) When the same battery powers both the transmission of the activation signals and of the 121.5‑MHz homing signal, the battery capacity should be sufficient to cover the transmission of the 121.5-MHz homing signal for 48 hours and the transmission of the activation signals for a duration sufficient to meet CS ACNS.E.LAD.420.
(c) The system should detect that the aircraft collided with terrain or water to initiate the transmission of a 121.5-MHz homing signal. The detection may be made by means of an acceleration sensor (‘g-switch’) or through other methods. Refer to EUROCAE ED-62B (including Change 1), Section 2.9.5.1
(d) The installation of the homing-signal transmitter and of its antenna should be such that after a successful ditching or landing, the transmission is possible despite damage to, or immersion of, the lower part of the fuselage and/or the wings.
[Issue: CS-ACNS/3]
EASA aviation regulations require aircraft homing signal transmitters to meet EUROCAE ED-62B specifications for automatic or deployable ELTs, excluding 406-MHz and COSPAS-SARSAT requirements. Batteries must power the 121.5-MHz signal for 48 hours. The system should automatically activate upon impact and transmit even after damage or immersion.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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