B737-700
Flight Crew Last 90 Days 417
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Incorrect / Not Installed / Unavailable Part; Human Factors; Procedure
After arriving at the aircraft; I checked the logbook and found that it was signed off with a new Release on (date) for aircraft X. I checked for all three landing gear pins in their storage space. The First Officer went outside and did the walkaround. He found a bolt in the left main landing gear. I notified both the Maintenance Supervisor and Chief Pilot of what was found. The bolt was long enough to prevent the landing gear from retracting.
A B737 Captain reported that an improper gear pin was used.