Narrative:

At approximately XA50, we (evening shops crew) moved aircraft from hangar to the new wash rack. I was in the cockpit as a brake rider. At the completion of the tow, I set brakes and shut down the aircraft, secured the aircraft, cockpit and departed. The brakes bled down at XB40. The aircraft rolled into a box structure. The nose radome was damaged as was the bulkhead and lower skin. The aircraft was chocked at the nose tires only. Supplemental information from acn 605573: after chocking nose tires and disconnecting tug and towbar, we left the area. After a few mins, the aircraft pushed the chock forward and the nose gear turned to the left. It rolled into a container about 12 ft away. The ramp is sloped more than a chock in the front of the nose tire could hold. Supplemental information from acn 605575: upon arrival at the wash rack we pulled the plane straight, and into the center of the wash rack. I chocked the nosewheels, and disconnected the towbar, and tug. I then looked for a ladder, to get the brake rider out of the cockpit -- I saw one on the next wash rack. I walked over to the next wash rack, got the ladder, and pushed it back to the aircraft. While pushing the ladder to aircraft, I noticed that the aft chock was about 4-6 inches behind the nosewheel. Then I went down to the nosewheel, and moved the aft chock, back, in contact, with the nosewheel. A mechanic came into the booth, and said the aircraft on the wash rack had rolled into the storage container. When I got to the wash rack, I saw that the aircraft had indeed struck the storage container. I then proceeded to where the chocks were, and noticed marks on the concrete that indicated the nosewheels had turned left, approximately 50 degrees, and pushed out of the chocks. I believe the cause of this event was the failure of the wing walkers to install main tire chocks, and my failure to require them to do so. I believe the problem is systemic in that no one, in shops, requires chocks to be installed on main wheels. By no one, I am referring to lead men, inspectors, safety, and management.

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Original NASA ASRS Text

Title: A B737-300 INCURRED STRUCTURAL DAMAGE TO THE RADOME, LOWER SKIN AND BULKHEAD AT STATION 178, CAUSED BY IMPROPERLY CHOCKED ACFT ROLLING INTO A STORAGE CONTAINER.

Narrative: AT APPROX XA50, WE (EVENING SHOPS CREW) MOVED ACFT FROM HANGAR TO THE NEW WASH RACK. I WAS IN THE COCKPIT AS A BRAKE RIDER. AT THE COMPLETION OF THE TOW, I SET BRAKES AND SHUT DOWN THE ACFT, SECURED THE ACFT, COCKPIT AND DEPARTED. THE BRAKES BLED DOWN AT XB40. THE ACFT ROLLED INTO A BOX STRUCTURE. THE NOSE RADOME WAS DAMAGED AS WAS THE BULKHEAD AND LOWER SKIN. THE ACFT WAS CHOCKED AT THE NOSE TIRES ONLY. SUPPLEMENTAL INFO FROM ACN 605573: AFTER CHOCKING NOSE TIRES AND DISCONNECTING TUG AND TOWBAR, WE LEFT THE AREA. AFTER A FEW MINS, THE ACFT PUSHED THE CHOCK FORWARD AND THE NOSE GEAR TURNED TO THE L. IT ROLLED INTO A CONTAINER ABOUT 12 FT AWAY. THE RAMP IS SLOPED MORE THAN A CHOCK IN THE FRONT OF THE NOSE TIRE COULD HOLD. SUPPLEMENTAL INFO FROM ACN 605575: UPON ARR AT THE WASH RACK WE PULLED THE PLANE STRAIGHT, AND INTO THE CTR OF THE WASH RACK. I CHOCKED THE NOSEWHEELS, AND DISCONNECTED THE TOWBAR, AND TUG. I THEN LOOKED FOR A LADDER, TO GET THE BRAKE RIDER OUT OF THE COCKPIT -- I SAW ONE ON THE NEXT WASH RACK. I WALKED OVER TO THE NEXT WASH RACK, GOT THE LADDER, AND PUSHED IT BACK TO THE ACFT. WHILE PUSHING THE LADDER TO ACFT, I NOTICED THAT THE AFT CHOCK WAS ABOUT 4-6 INCHES BEHIND THE NOSEWHEEL. THEN I WENT DOWN TO THE NOSEWHEEL, AND MOVED THE AFT CHOCK, BACK, IN CONTACT, WITH THE NOSEWHEEL. A MECH CAME INTO THE BOOTH, AND SAID THE ACFT ON THE WASH RACK HAD ROLLED INTO THE STORAGE CONTAINER. WHEN I GOT TO THE WASH RACK, I SAW THAT THE ACFT HAD INDEED STRUCK THE STORAGE CONTAINER. I THEN PROCEEDED TO WHERE THE CHOCKS WERE, AND NOTICED MARKS ON THE CONCRETE THAT INDICATED THE NOSEWHEELS HAD TURNED L, APPROX 50 DEGS, AND PUSHED OUT OF THE CHOCKS. I BELIEVE THE CAUSE OF THIS EVENT WAS THE FAILURE OF THE WING WALKERS TO INSTALL MAIN TIRE CHOCKS, AND MY FAILURE TO REQUIRE THEM TO DO SO. I BELIEVE THE PROB IS SYSTEMIC IN THAT NO ONE, IN SHOPS, REQUIRES CHOCKS TO BE INSTALLED ON MAIN WHEELS. BY NO ONE, I AM REFERRING TO LEAD MEN, INSPECTORS, SAFETY, AND MGMNT.

Data retrieved from NASA's ASRS site as of July 2007 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.