B737-700
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 247; Flight Crew Type 6400
Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Incorrect / Not Installed / Unavailable Part; Procedure; Human Factors
On my preflight walk around; I found a bolt in the left gear; gear pin slot. Bolt was approximately 1' long; and no aircraft markings noticeable. I re-checked the other gear pin areas to ensure that I hadn't missed another one. Upon returning to the cockpit I informed the Captain who in turn passed my disbelief and findings to Chief Pilot on call.
B737-700 First Officer reported that a bolt was installed in a gear pin slot for the main landing gear.