What happened
During the arrival phase at Santa Barbara, the pilot encountered difficulties extending the landing gear. Standard extension procedures were unsuccessful, prompting the use of the emergency hand pump. Despite these efforts, the aircraft landed with the landing gear only partially extended.
The investigation
A subsequent examination of the aircraft revealed an electrical problem within the gear circuit. The origin of this electrical fault could not be determined from the available evidence. However, when the emergency hand pump was utilized to lower the gear during the incident, that specific emergency system operated normally.
Findings
The primary issue involved an undetermined electrical fault in the landing gear circuit. While the emergency mechanical system functioned as designed, it was insufficient to fully extend the gear for a safe landing.