What was found
AIRCRAFT WAS GROUNDED: SIGNIFICANT AIR FRAME VIBRATION FELT PASSING 26,500 FT UNTIL 28,000 FT. FELT IT AGAIN LEVEL AT 13,000 FT. **SUPPLEMENTAL REPORT FOR AALA202201128804: MAINTENANCE ACCOMPLISHED TASK CARDS 26L00005067 AND 26L32527001 ALONG WITH AMM 27-24-00-200-002 WITH NO DEFECTS NOTED. A FUNCTIONAL CHECK FLIGHT WAS ACCOMPLISHED WITH NO DEFECTS REPORTED BY THE FLIGHT CREW. ** (CLOSED)