Jacksonville, FL, USA
N197GB
Rockwell 690
As the flight crew was returning to the airport for landing after a firefighting reconnaissance flight, the nose landing gear (NLG) was extended but the NLG position light did not illuminate. The flight crew cycled the gear and attempted to troubleshoot but was unable to resolve the problem. The pilot advised the tower controller of the situation and requested that the tower controller and other observers verify the position of the NLG during subsequent low passes. After being twice advised that the NLG appeared to be extended, the flight crew decided to divert to another airport that had crash rescue services. During the landing at the alternate airport, the nose landing gear collapsed, resulting in substantial damage to the fuselage. Examination of the nose landing gear determined that the roll pin in the spacer that connected the nosewheel steering cylinder to the strut had fractured in overstress. After the accident, the NLG was cycled using the gear extension handle in the cockpit, which revealed interference between the nose wheel actuator rod and the left forward gear door actuating rods. This interference likely prevented the nose landing gear from fully extending into the down-and-locked position.
On June 10, 2019, about 1846 eastern daylight time, a Rockwell 690A airplane, N197GB, was substantially damaged when it was involved in an accident near Jacksonville, Florida. The pilot and two crew members were not injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 135 firefighting flight. One of the pilots reported that, while returning to the airport after a reconnaissance flight, he extended the landing gear, but the nose landing gear (NLG) position light did not illuminate. The crew cycled the gear, then completed the checklist for a gear malfunction; but were unable to resolve the discrepancy. The pilot advised the tower controller of their situation and requested a low approach to verify the position of the NLG. The tower controller told the crew that the landing gear appeared to be down. They requested a second flyby to allow a company representative to look; he also reported that the landing gear appeared down, but suggested diverting to another airport where crash rescue was available. The flight crew agreed and diverted. During the subsequent landing, the NLG collapsed. Examination of the NLG assembly found that the roll pin installed in the spacer assembly was fractured. The fractured roll pin remained installed in the right and left sides of the spacer, which connects the nose wheel steering cylinder and the NLG strut. Metallurgical examination of the fractured roll pin revealed evidence of bending and shear stresses, which had resulted in an overstress fracture. With the assistance of maintenance personnel, the NLG was cycled using the gear extension handle in the cockpit. As the NLG was lowered, the nose wheel cylinder and actuator arm interfered with the nose wheel well main frame and jammed; the nose wheel would not extend past its gear doors. The forward nose landing gear doors were reinstalled and the NLG was cycled again. The nose wheel actuator rod jammed on the left forward gear door actuating rods, matching impact marks observed on the actuating rods.
The overstress fracture of the roll pin in the nose landing gear (NLG) spacer assembly which caused interference between the nose wheel actuator rod and the left forward gear door actuating rods preventing the NLG to fully extend into the full down and locked position resulting in a nose gear collapse during landing.
Source: NTSB Aviation Accident Database
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