A B737 captain reported that an improper gear pin was used.

Attributes
ACN	1578963
Time
Date	201809
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Dawn
Aircraft 1
Make Model Name	B737-700
Flight Phase	Parked
Person 1
Function	Captain Pilot Flying
Experience	Flight Crew Last 90 Days 417
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Maintenance Deviation - Procedural Published Material / Policy

Narrative:

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.

Original NASA ASRS Text

Title: A B737 Captain reported that an improper gear pin was used.

Narrative: 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.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.