A beam failed in the main landing gear.

Attributes
ACN	270018
Time
Date	199405
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz
State Reference	US
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	B727-200
Operating Under FAR Part	Part 121
Flight Phase	ground other : taxi landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 15000 flight time type : 7000
ASRS Report	270018
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : atp
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

After normal landing, during rollout (on a B727) we heard a bang and felt a slight yaw in the steering. This occurred at approximately 80 KTS. We cleared the runway. We thought maybe a tire had blown and asked the tower to scan the runway for debris. None was reported. Taxi seemed normal, so we proceeded to the gate. Upon inspection, we found the right main gear assembly had failed. I observed that, at the point of shear, there was only about 10 percent fresh brakes. Apparently there had been a fracture in the gear assembly for some time. Callback conversation with reporter revealed the following information: the reporter was a little vague as to exactly which part of the landing gear failed. It was apparently a horizontal beam connecting the fore and aft attach points. The failed beam was pushed up to the underside of the top wing and spoiler surfaces lifting the spoilers. There was very little further damage. The landing gear assembly had been installed only 3 yrs in the aircraft. This was only the second failure of this type in the B 727-200 known to the reporter.

Original NASA ASRS Text

Title: A BEAM FAILED IN THE MAIN LNDG GEAR.

Narrative: AFTER NORMAL LNDG, DURING ROLLOUT (ON A B727) WE HEARD A BANG AND FELT A SLIGHT YAW IN THE STEERING. THIS OCCURRED AT APPROX 80 KTS. WE CLRED THE RWY. WE THOUGHT MAYBE A TIRE HAD BLOWN AND ASKED THE TWR TO SCAN THE RWY FOR DEBRIS. NONE WAS RPTED. TAXI SEEMED NORMAL, SO WE PROCEEDED TO THE GATE. UPON INSPECTION, WE FOUND THE R MAIN GEAR ASSEMBLY HAD FAILED. I OBSERVED THAT, AT THE POINT OF SHEAR, THERE WAS ONLY ABOUT 10 PERCENT FRESH BRAKES. APPARENTLY THERE HAD BEEN A FRACTURE IN THE GEAR ASSEMBLY FOR SOME TIME. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR WAS A LITTLE VAGUE AS TO EXACTLY WHICH PART OF THE LNDG GEAR FAILED. IT WAS APPARENTLY A HORIZ BEAM CONNECTING THE FORE AND AFT ATTACH POINTS. THE FAILED BEAM WAS PUSHED UP TO THE UNDERSIDE OF THE TOP WING AND SPOILER SURFACES LIFTING THE SPOILERS. THERE WAS VERY LITTLE FURTHER DAMAGE. THE LNDG GEAR ASSEMBLY HAD BEEN INSTALLED ONLY 3 YRS IN THE ACFT. THIS WAS ONLY THE SECOND FAILURE OF THIS TYPE IN THE B 727-200 KNOWN TO THE RPTR.

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.