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Instructor with private pilot receiving tailwheel endorsement practicing touch and goes, gars and slips have engine problem after takeoff. Power is intermittent, then decreases altogether. Emergency landing made.
| Attributes | |
| ACN | 366542 |
| Time | |
| Date | 199704 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : uao |
| State Reference | OR |
| Altitude | agl bound lower : 300 agl bound upper : 300 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | general aviation : personal |
| Make Model Name | Cessna 140 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : takeoff other |
| Flight Plan | None |
| Person 1 | |
| Affiliation | Other |
| Function | instruction : instructor |
| Qualification | pilot : commercial pilot : instrument pilot : cfi |
| Experience | flight time last 90 days : 30 flight time total : 5680 flight time type : 14 |
| ASRS Report | 366542 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : student pilot : private |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : declared emergency none taken : unable other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
On 13TH approach to landing, practicing slips and crosswind lndgs and gars for private pilot earning tail dragger endorsement. After touchdown simulated go around. At 300 ft, a smooth decrease in power occurred, then power returned. Based on past experience, I at first thought this was due to unporting the fuel line in the wing tank during the slip and expected the power to return to normal. The power did come back for a few seconds, but then decreased and began fluctuating up and down. We were able to climb or leveloff during the power increases, but were in a slow descent trend. I checked mixture rich, carburetor heat on, and adjusted the throttle to no avail. I opted not to change tanks due to the low altitude and airspeed (best glide), and obstacles (power lines, trees, ditches and houses on all sides). Reached a position where we could make a small wheat field, made a steep bank to right to set up for a short base to burn up excess altitude, then immediately banked left and applied full rudder to forward slip to a landing. Touched down tailwheel first with mains following lightly (3 point attitude). Held yoke all the way back to keep from flipping. Aircraft, instructor and student all unharmed. Aircraft gone to shop to determine cause of power loss.
Original NASA ASRS Text
Title: INSTRUCTOR WITH PVT PLT RECEIVING TAILWHEEL ENDORSEMENT PRACTICING TOUCH AND GOES, GARS AND SLIPS HAVE ENG PROB AFTER TKOF. PWR IS INTERMITTENT, THEN DECREASES ALTOGETHER. EMER LNDG MADE.
Narrative: ON 13TH APCH TO LNDG, PRACTICING SLIPS AND XWIND LNDGS AND GARS FOR PVT PLT EARNING TAIL DRAGGER ENDORSEMENT. AFTER TOUCHDOWN SIMULATED GAR. AT 300 FT, A SMOOTH DECREASE IN PWR OCCURRED, THEN PWR RETURNED. BASED ON PAST EXPERIENCE, I AT FIRST THOUGHT THIS WAS DUE TO UNPORTING THE FUEL LINE IN THE WING TANK DURING THE SLIP AND EXPECTED THE PWR TO RETURN TO NORMAL. THE PWR DID COME BACK FOR A FEW SECONDS, BUT THEN DECREASED AND BEGAN FLUCTUATING UP AND DOWN. WE WERE ABLE TO CLB OR LEVELOFF DURING THE PWR INCREASES, BUT WERE IN A SLOW DSCNT TREND. I CHKED MIXTURE RICH, CARB HEAT ON, AND ADJUSTED THE THROTTLE TO NO AVAIL. I OPTED NOT TO CHANGE TANKS DUE TO THE LOW ALT AND AIRSPD (BEST GLIDE), AND OBSTACLES (PWR LINES, TREES, DITCHES AND HOUSES ON ALL SIDES). REACHED A POS WHERE WE COULD MAKE A SMALL WHEAT FIELD, MADE A STEEP BANK TO R TO SET UP FOR A SHORT BASE TO BURN UP EXCESS ALT, THEN IMMEDIATELY BANKED L AND APPLIED FULL RUDDER TO FORWARD SLIP TO A LNDG. TOUCHED DOWN TAILWHEEL FIRST WITH MAINS FOLLOWING LIGHTLY (3 POINT ATTITUDE). HELD YOKE ALL THE WAY BACK TO KEEP FROM FLIPPING. ACFT, INSTRUCTOR AND STUDENT ALL UNHARMED. ACFT GONE TO SHOP TO DETERMINE CAUSE OF PWR LOSS.
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.