FAA Aviation Safety
SPECIAL AIRWORTHINESS INFORMATION BULLETIN
SUBJ: Equipment/Furnishings: Emergency Locator Beacon, G-Switch Failures
Date: June 18, 2019
This is information only. Recommendations aren’t mandatory.
This Special Airworthiness Information Bulletin (SAIB) alerts you, aircraft owners and operators with installations of ACR Electronics, Inc. (ACR)(formerly Artex Aircraft Supplies, Inc. and Chelton Avionics, Inc. and doing business as Wulfsberg Electronics) emergency locator transmitters (ELT) G406-4, C406-1, C406-1HM, C406-2, C406-2HM, C406-N and C406-NHM identified by Part Number (P/N) and serial number (s/n) in Table 1 of this SAIB, of an airworthiness concern, specifically the ELT not transmitting alert and location signals in case of an accident due to an inoperative or a deteriorated G-switch. ELTs located in high vibration environments, for example in the tail of a helicopter, could have its acceleration sensor deteriorate after having been subjected to high levels of shock and vibration for five (5) years or more. This SAIB recommends best practices for the inspection, modification and replacement of these ELTs located in high vibration environments.
ELT Model P/N s/n (up to, inclusive)
G406-4 453-5012 210-08575
C406-1 453-5002 210-09438
C406-1HM 453-5003 All
C406-2 453-5000 210-09501
C406-2HM 453-5001 210-09936
C406-N 453-5060 252-01689
C406-NHM 453-5061 252-02321
Table 1: SAIB Applicability (Note this applicability is regardless of whether there are additional digits and Revision status appended to the ELT P/N, e.g. 453-5003-123 Rev B. is an affected P/N.)