What was found
FLIGHT LEVEL, FLIGHT WITH FLAPS 15 DEGREES AT 150 KNOTS CONTROL COLUMN SHUDDER NON STOP.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
FLIGHT LEVEL, FLIGHT WITH FLAPS 15 DEGREES AT 150 KNOTS CONTROL COLUMN SHUDDER NON STOP.