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A pilot reports his aircraft's propeller governor failure causing an overspd; low oil pressure; and a rough running engine producing reduced power.
| Attributes | |
| ACN | 701367 |
| Time | |
| Date | 200606 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : emp.airport |
| State Reference | KS |
| Altitude | msl single value : 8000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zkc.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Small Aircraft |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : instrument |
| Experience | flight time total : 3000 |
| ASRS Report | 701367 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : diverted to another airport flight crew : landed as precaution |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
In cruise; propeller suddenly oversped. Told ATC of problem and that I needed to land immediately. Emporia closest. After propeller surge; propeller slowed; manifold pressure dropped. Engine began running rough. Oil pressure below green. I reported that I thought I was losing the engine. I discovered that egt was very high. I enriched mixture. Engine stopped missing. RPM now 1900 (2400 normal). Descended and made straight-in on runway 19. Announced on CTAF and plane taxiing for opposite direction takeoff held. Landing normal with partial power. Propeller governor had failed. In none of my training or reading is this failure discussed; that I can recall. I was not prepared. Note: with new governor; oil pressure is higher and oil temperature lower than past 200-300 hours. Governor was failing -- I didn't know it!
Original NASA ASRS Text
Title: A PLT RPTS HIS ACFT'S PROP GOVERNOR FAILURE CAUSING AN OVERSPD; LOW OIL PRESSURE; AND A ROUGH RUNNING ENG PRODUCING REDUCED PWR.
Narrative: IN CRUISE; PROP SUDDENLY OVERSPED. TOLD ATC OF PROB AND THAT I NEEDED TO LAND IMMEDIATELY. EMPORIA CLOSEST. AFTER PROP SURGE; PROP SLOWED; MANIFOLD PRESSURE DROPPED. ENG BEGAN RUNNING ROUGH. OIL PRESSURE BELOW GREEN. I RPTED THAT I THOUGHT I WAS LOSING THE ENG. I DISCOVERED THAT EGT WAS VERY HIGH. I ENRICHED MIXTURE. ENG STOPPED MISSING. RPM NOW 1900 (2400 NORMAL). DSNDED AND MADE STRAIGHT-IN ON RWY 19. ANNOUNCED ON CTAF AND PLANE TAXIING FOR OPPOSITE DIRECTION TKOF HELD. LNDG NORMAL WITH PARTIAL PWR. PROP GOVERNOR HAD FAILED. IN NONE OF MY TRAINING OR READING IS THIS FAILURE DISCUSSED; THAT I CAN RECALL. I WAS NOT PREPARED. NOTE: WITH NEW GOVERNOR; OIL PRESSURE IS HIGHER AND OIL TEMP LOWER THAN PAST 200-300 HRS. GOVERNOR WAS FAILING -- I DIDN'T KNOW IT!
Data retrieved from NASA's ASRS site as of January 2009 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.