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J-3 pilot with passenger had the aircraft nose over and broke the wooden propeller. The right brake appeared to drag or lock up.
| Attributes | |
| ACN | 604667 |
| Time | |
| Date | 200401 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | general aviation : personal |
| Make Model Name | J3 Cub |
| Operating Under FAR Part | Part 91 |
| Flight Phase | landing : roll |
| Flight Plan | None |
| Person 1 | |
| Affiliation | other |
| Function | flight crew : single pilot |
| Qualification | pilot : private |
| Experience | flight time last 90 days : 24 flight time total : 1320 flight time type : 600 |
| ASRS Report | 604667 |
| Person 2 | |
| Function | observation : passenger |
| Qualification | pilot : private |
| Experience | flight time last 90 days : 34.3 flight time total : 120.6 flight time type : 30.8 |
| ASRS Report | 604543 |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly |
| Independent Detector | other flight crewa other other : 2 |
| Resolutory Action | aircraft : evacuated flight crew : took precautionary avoidance action |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Aircraft |
Narrative:
Noted windsock indications were judged to be 3-4 mph close to down the runway and good VFR conditions. The cub from runway center was rolling out straight and down to about 15 mph when it started a moderate right turn without brake or rudder input. I immediately applied full left rudder, left brake with stick still full aft (no right brake being applied). The cub continued turning right with right wheel dragging and decelerating. The cub now at about a 50 degree angle forward to the runway, and at the edge, the cub tipped down on its nose destroying the wood propeller. The cub remained on its nose and we exited. The nose-over was fairly gentle with no injuries. No airframe or fabric damage was detected. My long time taildragger experience indicates this right turn force would have easily been corrected by the action I took if everything was functioning normally. Cause of unprovoked right turn is yet to be determined. The throttle remained closed from flare to stop. When the tail lifted, I stopped using left brake and right wheel seemed to still be braking. The tail wheel leaving the ground to nose on the ground was about 2 1/2 seconds. Supplemental information from acn 604543: determining the cause for this so far might have been wheel, brake ice, or brake malfunction.
Original NASA ASRS Text
Title: J-3 PLT WITH PAX HAD THE ACFT NOSE OVER AND BROKE THE WOODEN PROP. THE R BRAKE APPEARED TO DRAG OR LOCK UP.
Narrative: NOTED WINDSOCK INDICATIONS WERE JUDGED TO BE 3-4 MPH CLOSE TO DOWN THE RWY AND GOOD VFR CONDITIONS. THE CUB FROM RWY CTR WAS ROLLING OUT STRAIGHT AND DOWN TO ABOUT 15 MPH WHEN IT STARTED A MODERATE R TURN WITHOUT BRAKE OR RUDDER INPUT. I IMMEDIATELY APPLIED FULL L RUDDER, L BRAKE WITH STICK STILL FULL AFT (NO R BRAKE BEING APPLIED). THE CUB CONTINUED TURNING R WITH R WHEEL DRAGGING AND DECELERATING. THE CUB NOW AT ABOUT A 50 DEG ANGLE FORWARD TO THE RWY, AND AT THE EDGE, THE CUB TIPPED DOWN ON ITS NOSE DESTROYING THE WOOD PROP. THE CUB REMAINED ON ITS NOSE AND WE EXITED. THE NOSE-OVER WAS FAIRLY GENTLE WITH NO INJURIES. NO AIRFRAME OR FABRIC DAMAGE WAS DETECTED. MY LONG TIME TAILDRAGGER EXPERIENCE INDICATES THIS R TURN FORCE WOULD HAVE EASILY BEEN CORRECTED BY THE ACTION I TOOK IF EVERYTHING WAS FUNCTIONING NORMALLY. CAUSE OF UNPROVOKED R TURN IS YET TO BE DETERMINED. THE THROTTLE REMAINED CLOSED FROM FLARE TO STOP. WHEN THE TAIL LIFTED, I STOPPED USING L BRAKE AND R WHEEL SEEMED TO STILL BE BRAKING. THE TAIL WHEEL LEAVING THE GND TO NOSE ON THE GND WAS ABOUT 2 1/2 SECONDS. SUPPLEMENTAL INFO FROM ACN 604543: DETERMINING THE CAUSE FOR THIS SO FAR MIGHT HAVE BEEN WHEEL, BRAKE ICE, OR BRAKE MALFUNCTION.
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.