In one incident, a portion of the elevator tab separated from the airplane, causing damage to the elevator tab, elevator, and horizontal stabilizer.
12.
In one case, the vibration caused a piece of the elevator tab mechanism broke off in flight and damaged the plane, FAA officials said.
13.
The FAA said it had received several reports " indicating high-frequency airframe vibrations of the elevator tab " on older 737-series airplanes during flight.
14.
In one case, the vibration caused a piece of the elevator tab mechanism to break off in flight and damaged the plane, FAA officials said.
15.
An FAA statement said the agency had received several reports " indicating high-frequency airframe vibrations of the elevator tab " on older 737s in flight.
16.
Such vibrations have been attributed to excessive free play of the elevator tab, resulting in severe damage to the elevator, elevator tab, and elevator tab control mechanism, " the FAA said.
17.
Such vibrations have been attributed to excessive free play of the elevator tab, resulting in severe damage to the elevator, elevator tab, and elevator tab control mechanism, " the FAA said.
18.
Such vibrations have been attributed to excessive free play of the elevator tab, resulting in severe damage to the elevator, elevator tab, and elevator tab control mechanism, " the FAA said.
19.
Elevator tab control rods, part of a backup for the hydraulic system normally used by pilots to move the elevators, would be used only if both the primary and secondary hydraulic system failed.
20.
Several reports indicated that the source of the vibration was an elevator tab vibrating due to wear of the hinges and the control system, which caused the elevator tab assemblies to come loosex.
