Incident Overview
The airplane experienced a hard landing during the initial touchdown. As a result, the nose tires failed, and damage occurred to the general area of the nose landing gear support structure. Additionally, foreign object damage was sustained by the #1 and #3 engines.
Flight Data Recorder Analysis
Data from the flight data recorder (FDR) indicated that the initial touchdown acceleration had a value of 1.9488 G's. At that time, the throttle resolver angles were 52.03, 51.33, and 49.22 degrees for the number one, two, and three engines, respectively. The FDR also revealed that after touchdown, the airplane experienced four oscillations in the pitch axis. The maximum pitch angle during this time was +5.98 degrees nose up, and the minimum value was -2.46 degrees nose down. During this time frame, spoiler positions never exceeded 8.0 degrees of deflection, and the nose weight on wheels parameter changed four times.