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A C172 CFI aborts his takeoff when extreme shimmying is felt. A propeller strike occurs after the nosewheel leaves the aircraft at about 25 KTS.
| Attributes | |
| ACN | 417093 |
| Time | |
| Date | 199810 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : dab |
| State Reference | FL |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : tlh |
| Operator | general aviation : instructional |
| Make Model Name | Skyhawk 172/Cutlass 172 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : takeoff other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : cfi |
| Experience | flight time last 90 days : 130 flight time total : 620 flight time type : 120 |
| ASRS Report | 417093 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : non radar |
| Events | |
| Anomaly | aircraft equipment problem : critical conflict : ground critical other anomaly other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : declared emergency flight crew : rejected takeoff |
| Consequence | other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
Sunday afternoon XY35 at dab runway 7L intersection N4, I was ready for departure in a C172 cutlass. I had the clearance to take off. I taxied the airplane on the runway and aligned the airplane on the centerline, applied full power. After a few seconds, I had intense vibration on the nosewheel. (Hard to keep the airplane on the centerline.) I thought I had a flat tire, so I brought back the throttle (power to idle) and kept the nose up to avoid further damage to the nosewheel, then nosewheel came down itself and the propeller hit the runway at about 25 KTS. At the same time, I brought back the mixture and secured the engine. During that time I couldn't keep the directional control, so I was on far left side of the centerline. I looked at the airplane from the outside -- the nosewheel wasn't there. During the takeoff roll, the nosewheel came off. Nuts and cotter pins were in proper position during preflight.
Original NASA ASRS Text
Title: A C172 CFI ABORTS HIS TKOF WHEN EXTREME SHIMMYING IS FELT. A PROP STRIKE OCCURS AFTER THE NOSEWHEEL LEAVES THE ACFT AT ABOUT 25 KTS.
Narrative: SUNDAY AFTERNOON XY35 AT DAB RWY 7L INTXN N4, I WAS READY FOR DEP IN A C172 CUTLASS. I HAD THE CLRNC TO TAKE OFF. I TAXIED THE AIRPLANE ON THE RWY AND ALIGNED THE AIRPLANE ON THE CTRLINE, APPLIED FULL PWR. AFTER A FEW SECONDS, I HAD INTENSE VIBRATION ON THE NOSEWHEEL. (HARD TO KEEP THE AIRPLANE ON THE CTRLINE.) I THOUGHT I HAD A FLAT TIRE, SO I BROUGHT BACK THE THROTTLE (PWR TO IDLE) AND KEPT THE NOSE UP TO AVOID FURTHER DAMAGE TO THE NOSEWHEEL, THEN NOSEWHEEL CAME DOWN ITSELF AND THE PROP HIT THE RWY AT ABOUT 25 KTS. AT THE SAME TIME, I BROUGHT BACK THE MIXTURE AND SECURED THE ENG. DURING THAT TIME I COULDN'T KEEP THE DIRECTIONAL CTL, SO I WAS ON FAR L SIDE OF THE CTRLINE. I LOOKED AT THE AIRPLANE FROM THE OUTSIDE -- THE NOSEWHEEL WASN'T THERE. DURING THE TKOF ROLL, THE NOSEWHEEL CAME OFF. NUTS AND COTTER PINS WERE IN PROPER POS DURING PREFLT.
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.