Incident Overview
An airliner experienced a landing gear malfunction during its approach. The aircraft had undergone maintenance prior to departure, after which mechanics removed the wheel chocks and towed it to the departure gate. A pre-flight inspection was completed by the first officer, and a lead safety agent also inspected the airplane shortly before pushback.
Landing Gear Malfunction
While making the landing approach, the first officer commanded the landing gear to extend. The crew observed two green landing gear safe lights, but one landing gear unsafe light illuminated. After multiple attempts, the crew determined that the left landing gear would not extend. The captain subsequently landed the airplane with the left main landing gear partially extended.
Investigation Findings
On-scene investigation revealed that wheel chocks were wedged between the wheel well lip and the inside of the left main gear tire. The company had not established procedures concerning the placement of wheel chocks by its maintenance, flight, and ground service personnel.