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A cessna 172 in cruise at 3000 ft had engine begin to run rough. Reported problem to tower and diverted. Cause of engine malfunction unknown.
| Attributes | |
| ACN | 526893 |
| Time | |
| Date | 200110 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : vny.airport |
| State Reference | CA |
| Altitude | msl single value : 3000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tower : vny.tower |
| Operator | general aviation : instructional |
| Make Model Name | Skyhawk 172/Cutlass 172 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Route In Use | enroute : direct |
| Flight Plan | None |
| Person 1 | |
| Affiliation | other |
| Function | instruction : instructor |
| Qualification | pilot : cfi pilot : commercial pilot : instrument pilot : multi engine |
| Experience | flight time last 90 days : 20 flight time total : 1350 flight time type : 50 |
| ASRS Report | 526893 |
| Person 2 | |
| Affiliation | other |
| Function | instruction : trainee |
| Qualification | pilot : student |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | aircraft : equipment problem dissipated flight crew : diverted to another airport flight crew : overcame equipment problem |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Aircraft |
Narrative:
Returning to vny from simi valley and during training mission. Engine began to run rough. I took control from the student. Troubleshot problem. Contacted vny tower of intentions to maintain 3000 ft altitude for precaution until close to airport. Reduced altitude approximately 3 miles northwest of airport to pattern altitude. Was able to land aircraft without incident. No emergency declared. Exact source of engine trouble unknown. Possible carburetor ice but unsure as even with carburetor heat activated engine was rough for at least two mins prior to settling down. During this non declared emergency (precautionary pilot decision) aircraft came close to floor of class C airspace. Was in contact with vny tower and a socal transponder code issued.
Original NASA ASRS Text
Title: A CESSNA 172 IN CRUISE AT 3000 FT HAD ENG BEGIN TO RUN ROUGH. RPTED PROB TO TWR AND DIVERTED. CAUSE OF ENG MALFUNCTION UNKNOWN.
Narrative: RETURNING TO VNY FROM SIMI VALLEY AND DURING TRAINING MISSION. ENG BEGAN TO RUN ROUGH. I TOOK CTL FROM THE STUDENT. TROUBLESHOT PROB. CONTACTED VNY TWR OF INTENTIONS TO MAINTAIN 3000 FT ALT FOR PRECAUTION UNTIL CLOSE TO ARPT. REDUCED ALT APPROX 3 MILES NW OF ARPT TO PATTERN ALT. WAS ABLE TO LAND ACFT WITHOUT INCIDENT. NO EMER DECLARED. EXACT SOURCE OF ENG TROUBLE UNKNOWN. POSSIBLE CARB ICE BUT UNSURE AS EVEN WITH CARB HEAT ACTIVATED ENG WAS ROUGH FOR AT LEAST TWO MINS PRIOR TO SETTLING DOWN. DURING THIS NON DECLARED EMER (PRECAUTIONARY PLT DECISION) ACFT CAME CLOSE TO FLOOR OF CLASS C AIRSPACE. WAS IN CONTACT WITH VNY TWR AND A SOCAL TRANSPONDER CODE ISSUED.
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.