Accident Details
On November 9, 2012, at approximately 2007 central standard time, N619BA, a Fairchild Aircraft, Inc., SA227-AC multi-engine airplane, experienced a left main landing gear collapse during landing at Minneapolis St. Paul International Airport (MSP) in Minneapolis, Minnesota. The airplane sustained minor damage, and the pilot was uninjured. The aircraft was registered to and operated by Bemidji Aviation Services, Inc., conducting a scheduled cargo flight under 14 Code of Federal Regulations Part 135.
Flight and Landing
The flight originated from Duluth International Airport (DLH) in Duluth, Minnesota, at about 1926, destined for MSP. Night visual meteorological conditions (VMC) were present, and an instrument flight rules (IFR) flight plan had been filed. The pilot reported that all three green landing gear indicator lights were illuminated before performing what was otherwise a normal landing. Approximately 50 to 100 feet after touchdown on the runway, the left main landing gear collapsed. The airplane then skidded off the left side of the runway and came to rest upright on the grass.
Post-Incident Examination
A post-incident examination of the airplane revealed two loose electrical connections to the hydraulic system. An overhaul teardown of the hydraulic shuttle valve showed the seat was out of tolerance, the cap safety wire holes were damaged, and a washer was not to the current revision. The washer also exhibited corrosion. Additionally, an examination of the hydraulic power pack found a washer that was not to the current revision. After the electrical wiring was repaired and the hydraulic power pack and shuttle valve were replaced, the system operated normally.
Operator Action
In response to the incident, the operator revised their life limitations on the hydraulic power pack to comply with the instructions specified in the manufacturer's service letter.