What was found
ELT FAILS G-SWITCH TEST DURING 12 MONTH ELT INSPECTION. REMOVED ELT FOR MAINTENANCE IAW FAR 91.207. THIS FAILURE IS THE 9TH OCCURRENCE OF THIS MODEL ELT FAILING THE G-SWITCH ON ITS FIRST 12 MONTH INSPECTION. PINNACLE AIRLINES REACHED THE 12 MONTH INVERVAL ON ONLY 16 AIRCRAFT EQUIPPED WITH THIS MODEL ELT PRIOR TO THIS FAILURE. THE MANUFACTURER HAS CONFIRMED THE G-SWITCH FAILURE ON THE OTHER 8 UNITS. (M)