Right main landing gear collapsed during landing roll on an small aircraft sel causing pilot to lose...

Attributes
ACN	270222
Time
Date	199405
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : 3cm
State Reference	MI
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	landing other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : private
Experience	flight time last 90 days : 15 flight time total : 1355 flight time type : 275
ASRS Report	270222
Events
Anomaly	aircraft equipment problem : critical other anomaly other anomaly other other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	none taken : unable
Consequence	other Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Entered mid point left downwind for runway 18. Extended gear upon entering. Confirmed appearance left gear extending. 40 degrees of flaps. IAS 85 LORAN ground speed 70 KTS. Flared for landing and on touchdown, plane acted 'squirrely.' plane started veering to the right. Nose started to rise enough to block forward vision. Applied full left rudder, but to no avail. Plane came to rest off edge of runway in soft mud. Post incident analysis, is that on extension of gear, gear motor kept running and popped the gear pump motor circuit breaker. Hydraulic pressure apparently reduced. Pilot operating handbook advises if gear pump motor runs longer than 30 seconds, pilot should pull the circuit breaker. Pilot wears david clark 10-80 headset with gel filled ear cups. These reduce exterior noise to the point that it would be impossible to hear the gear pump motor running. Damage not enough to consider the event an accident.

Original NASA ASRS Text

Title: R MAIN LNDG GEAR COLLAPSED DURING LNDG ROLL ON AN SMA SEL CAUSING PLT TO LOSE CTL OF ACFT. ACFT RECEIVED ONLY MINOR DAMAGE WHEN IT WENT OFF EDGE OF RWY INTO THE MUD.

Narrative: ENTERED MID POINT L DOWNWIND FOR RWY 18. EXTENDED GEAR UPON ENTERING. CONFIRMED APPEARANCE L GEAR EXTENDING. 40 DEGS OF FLAPS. IAS 85 LORAN GND SPD 70 KTS. FLARED FOR LNDG AND ON TOUCHDOWN, PLANE ACTED 'SQUIRRELY.' PLANE STARTED VEERING TO THE R. NOSE STARTED TO RISE ENOUGH TO BLOCK FORWARD VISION. APPLIED FULL L RUDDER, BUT TO NO AVAIL. PLANE CAME TO REST OFF EDGE OF RWY IN SOFT MUD. POST INCIDENT ANALYSIS, IS THAT ON EXTENSION OF GEAR, GEAR MOTOR KEPT RUNNING AND POPPED THE GEAR PUMP MOTOR CIRCUIT BREAKER. HYD PRESSURE APPARENTLY REDUCED. PLT OPERATING HANDBOOK ADVISES IF GEAR PUMP MOTOR RUNS LONGER THAN 30 SECONDS, PLT SHOULD PULL THE CIRCUIT BREAKER. PLT WEARS DAVID CLARK 10-80 HEADSET WITH GEL FILLED EAR CUPS. THESE REDUCE EXTERIOR NOISE TO THE POINT THAT IT WOULD BE IMPOSSIBLE TO HEAR THE GEAR PUMP MOTOR RUNNING. DAMAGE NOT ENOUGH TO CONSIDER THE EVENT AN ACCIDENT.

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.

Right main landing gear collapsed during landing roll on an small aircraft sel causing pilot to lose control of aircraft. Aircraft received only minor damage when it went off edge of runway into the mud.