What was found
AIRCRAFT WAS GROUNDED: AIRFRAME VIBRATION AT FL 280. VIBRATION STOPPED WHEN WE SLOWED TO 270 KTS. **SUPPLEMENTAL REPORT WILL BE SUBMITTED** (OPEN)
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AIRCRAFT WAS GROUNDED: AIRFRAME VIBRATION AT FL 280. VIBRATION STOPPED WHEN WE SLOWED TO 270 KTS. **SUPPLEMENTAL REPORT WILL BE SUBMITTED** (OPEN)