The downward force of the
horizontal stabilizer, increased or decreased by elevator deflection inputs, is what permits the pilot to move the airplane in these curved flight paths.
The aircraft returned from a flight with both
horizontal stabilizer mount bolts broken (p/n AN3-11A).
A total of 384 people died in the crashes, which were linked to the Maneuvering Characteristics Augmentation System (MCAS), which pivots the
horizontal stabilizer to force the nose down when an incipient stall is detected.
The FAA directive ordered operators to revise the airplane flight manual to give flight crews
horizontal stabilizer trim procedures to follow under certain conditions.
Second, UTC will divest Rockwell Collins's trimmable
horizontal stabilizer actuators business.
The
horizontal stabilizer forward spar fractured about two inches outboard of the fuselage on both sides.
2 was a
horizontal stabilizer panel segment, almost certainly from the Malaysian Airlines Boeing 777 aircraft, registered 9M-MRO," the report added.
UTC Aerospace Systems will now also provide the
horizontal stabilizer trim actuator that moves the
horizontal stabilizer to trim and stabilize the aircraft in the pitch axis during flight.
The FAA alleges "FedEx failed to rebalance a
horizontal stabilizer tab control surface on the Boeing 727 after repainting the part.
While looking at the aircraft discrepancy book for our aircraft, my flight engineer and I noticed a few gripes about the autopilot having difficulty trimming the
horizontal stabilizer. Throughout the first week of the trip, we noticed this problem.
A seasoned National Transportation Safety Board investigator and consultant, Vernon Grose, revealed that his preliminary assessment pointed that if the plane disintegrated, he would expect to find large pieces of wreckage, including the wings, the
horizontal stabilizer in the tail and the vertical fin.
The agency said it had been informed of an "incorrect procedure used to apply the wear and corrosion protective surface coating to attach pins of the
horizontal stabilizer rear spar, AFP reported.