What was found
AIRFRAME VIBRATION BETWEEN 340 AND 320 KIAS. VIBRATION GOES AWAY WITH EXTENSION OF SPEED BRAKE AND BELOW 320 KIAS. ADJUSTED LT AND RT OUTBOARD AFT FLAP OUTBOARD ECCENTRICS PER THE 727 MAINTENANCE MANUAL.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AIRFRAME VIBRATION BETWEEN 340 AND 320 KIAS. VIBRATION GOES AWAY WITH EXTENSION OF SPEED BRAKE AND BELOW 320 KIAS. ADJUSTED LT AND RT OUTBOARD AFT FLAP OUTBOARD ECCENTRICS PER THE 727 MAINTENANCE MANUAL.