Widebody transport aircraft has main gear support trunnion break on landing roll.

Attributes
ACN	292605
Time
Date	199412
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : jfk
State Reference	NY
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B747 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : flight engineer pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 15000 flight time type : 700
ASRS Report	292605
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa other other : unspecified
Resolutory Action	none taken : unable
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

After a very smooth touchdown on runway 31R at jfk with all indications normal nosewheel was lowered and engines reversed. At that time or soon thereafter aircraft was noticed to be slightly left wing down. Simultaneously the flight attendant at L-3 door reported what sounded like an explosion under the left wing. Aircraft was slowed and turned off at the last high speed taxiway and stopped just clear of the active runway. Brakes were parked, engines shut down and ground control notified to dispatch the rescue equipment. PA announcements were made to the cabin and company and maintenance notified. Port authority/authorized police arrived with steps some 10-15 min later and passenger were deplaned from R-1 door. When company maintenance arrived they advised that the left wing gear support trunnion had broken causing the gear to give way and slant backwards. The crew then deplaned and maintenance took control of the airplane. No indications or any problems were noticed on preflight at san juan. Also all indications of gear being safely down and locked were observed on final approach at jfk. WX was clear and daylight.

Original NASA ASRS Text

Title: WDB ACFT HAS MAIN GEAR SUPPORT TRUNNION BREAK ON LNDG ROLL.

Narrative: AFTER A VERY SMOOTH TOUCHDOWN ON RWY 31R AT JFK WITH ALL INDICATIONS NORMAL NOSEWHEEL WAS LOWERED AND ENGS REVERSED. AT THAT TIME OR SOON THEREAFTER ACFT WAS NOTICED TO BE SLIGHTLY L WING DOWN. SIMULTANEOUSLY THE FA AT L-3 DOOR RPTED WHAT SOUNDED LIKE AN EXPLOSION UNDER THE L WING. ACFT WAS SLOWED AND TURNED OFF AT THE LAST HIGH SPD TXWY AND STOPPED JUST CLR OF THE ACTIVE RWY. BRAKES WERE PARKED, ENGS SHUT DOWN AND GND CTL NOTIFIED TO DISPATCH THE RESCUE EQUIP. PA ANNOUNCEMENTS WERE MADE TO THE CABIN AND COMPANY AND MAINT NOTIFIED. PORT AUTH POLICE ARRIVED WITH STEPS SOME 10-15 MIN LATER AND PAX WERE DEPLANED FROM R-1 DOOR. WHEN COMPANY MAINT ARRIVED THEY ADVISED THAT THE L WING GEAR SUPPORT TRUNNION HAD BROKEN CAUSING THE GEAR TO GIVE WAY AND SLANT BACKWARDS. THE CREW THEN DEPLANED AND MAINT TOOK CTL OF THE AIRPLANE. NO INDICATIONS OR ANY PROBS WERE NOTICED ON PREFLT AT SAN JUAN. ALSO ALL INDICATIONS OF GEAR BEING SAFELY DOWN AND LOCKED WERE OBSERVED ON FINAL APCH AT JFK. WX WAS CLR AND DAYLIGHT.

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.