Accidents
NTSB Pins September CJ4 Accident on Maintenance
Pin not seated far enough forward for retention
Image from NTSB report showing right wing damage
Image from NTSB report showing right wing damage

Improper installation of a right main landing gear trunnion pin caused a Cessna Citation CJ4’s landing gear to collapse during rollout in September, the NTSB said in its final report. Neither pilot was injured in the accident, but the collapse punctured the right wing and caused substantial structural damage.

Investigators determined that the aft main landing gear trunnion pin for the right landing gear had not been installed far enough forward. According to the report, the right gear’s aft trunnion pin “was not installed far enough  [forward] to allow the retaining roll pin to engage and retain the trunnion pin.” Maintenance at a manufacturer’s service center, including removal and reinstallation of the trunnion pin, had been completed only 2.9 flight hours before the accident.