 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Immediately after liftoff and upon power reduction, power and RPM reduced severely, pilot landed on parallel taxiway.
| Attributes | |
| ACN | 183835 |
| Time | |
| Date | 199107 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : sjc |
| State Reference | CA |
| Altitude | agl bound lower : 0 agl bound upper : 150 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : sjc |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft, High Wing, 1 Eng, Fixed Gear |
| Flight Phase | climbout : takeoff landing other other |
| Flight Plan | None |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument pilot : private |
| Experience | flight time last 90 days : 5 flight time total : 2000 flight time type : 150 |
| ASRS Report | 183835 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : non radar |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | other other : unspecified cockpit |
| Resolutory Action | flight crew : regained aircraft control none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
After executing run up per checklist I commenced takeoff on runway 30R at sjc. After liftoff, as has been my practice, I reduced throttle to climb power by reference to manifold pressure gauge and reduced RPM to 'top of the green' by reference to tachometer. To my surprise the RPM continued to drop past the desired RPM and at an estimated 150 ft altitude my climb ceased. Visually it appeared I might overrun the 30R runway if I attempted to land on it. The parallel taxiway (#2) was about 2000 ft larger and unoccupied, so I commenced a slight turn to line up with it and called the tower and received clearance to land on the taxiway and did so uneventfully. Only upon roll out, did I discover that I had been screwing out the vernier mixture control instead of the vernier propeller control while watching the RPM indicator. Corrective action: 1) I will positively identify controls before operation by color and shape. 2) I will not reset throttle or mixture until high enough (say 500 ft) to give myself at least minimal troubleshooting time.
Original NASA ASRS Text
Title: IMMEDIATELY AFTER LIFTOFF AND UPON PWR REDUCTION, PWR AND RPM REDUCED SEVERELY, PLT LANDED ON PARALLEL TAXIWAY.
Narrative: AFTER EXECUTING RUN UP PER CHKLIST I COMMENCED TKOF ON RWY 30R AT SJC. AFTER LIFTOFF, AS HAS BEEN MY PRACTICE, I REDUCED THROTTLE TO CLB PWR BY REFERENCE TO MANIFOLD PRESSURE GAUGE AND REDUCED RPM TO 'TOP OF THE GREEN' BY REFERENCE TO TACHOMETER. TO MY SURPRISE THE RPM CONTINUED TO DROP PAST THE DESIRED RPM AND AT AN ESTIMATED 150 FT ALT MY CLB CEASED. VISUALLY IT APPEARED I MIGHT OVERRUN THE 30R RWY IF I ATTEMPTED TO LAND ON IT. THE PARALLEL TAXIWAY (#2) WAS ABOUT 2000 FT LARGER AND UNOCCUPIED, SO I COMMENCED A SLIGHT TURN TO LINE UP WITH IT AND CALLED THE TWR AND RECEIVED CLRNC TO LAND ON THE TAXIWAY AND DID SO UNEVENTFULLY. ONLY UPON ROLL OUT, DID I DISCOVER THAT I HAD BEEN SCREWING OUT THE VERNIER MIXTURE CTL INSTEAD OF THE VERNIER PROP CTL WHILE WATCHING THE RPM INDICATOR. CORRECTIVE ACTION: 1) I WILL POSITIVELY IDENTIFY CTLS BEFORE OPERATION BY COLOR AND SHAPE. 2) I WILL NOT RESET THROTTLE OR MIXTURE UNTIL HIGH ENOUGH (SAY 500 FT) TO GIVE MYSELF AT LEAST MINIMAL TROUBLESHOOTING TIME.
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.