<< >> NASA ASRS Report 593980, September 2003

Flight instructor and student suffer engine roughness and partial loss of power overhead ccr. Request and receive priority handling for landing.

Attributes
ACN	593980
Time
Date	200309
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : ccr.vor
State Reference	CA
Altitude	msl single value : 3500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : ccr.tower
Operator	general aviation : instructional
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Flight Plan	None
Person 1
Affiliation	other
Function	instruction : instructor
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 200 flight time total : 1100 flight time type : 1000
ASRS Report	593980
Person 2
Affiliation	other
Function	instruction : trainee
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : landed as precaution
Consequence	other other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

About 3 mi north of ccr VOR, our C172 had a rough engine at 3500 ft MSL. Tried to troubleshoot and flow check, but it didn't work. Therefore, I requested priority landing over the concord airport (buchanan field) and landed on runway 19R. After landing, checked magnetos and mixture, etc, but the student and I couldn't find out what was wrong. The temperature at 3500 ft MSL was about 25 degrees C. No signs of carburetor icing, no signs of magneto problems. Callback conversation with reporter revealed the following information: reporter elaborated that the engine roughness resulted in reduced power availability and that he requested priority landing clearance rather than declare an emergency because he felt that failure was not imminent. They were unable to quickly determine a cause after landing and left the aircraft with a maintenance facility. Reporter is unaware of the ultimate evaluation of the problem.

Related reports:

• C-172 flight instructor experienced engine roughness in flig...
• C150 instructor reported engine roughness and loss of power ...
• Piper PA-38 tomahawk instructor pilot reported experiencing ...
• Instructor and student on first flight lesson experience eng...
• GA flight instructor reported severe engine roughness after ...
• PA28R flight instructor reported engine roughness that resul...

	Enter your search terms Submit search form
	Web www.37000feet.com

Original NASA ASRS Text

Title: FLT INSTRUCTOR AND STUDENT SUFFER ENG ROUGHNESS AND PARTIAL LOSS OF PWR OVERHEAD CCR. REQUEST AND RECEIVE PRIORITY HANDLING FOR LNDG.

Narrative: ABOUT 3 MI N OF CCR VOR, OUR C172 HAD A ROUGH ENG AT 3500 FT MSL. TRIED TO TROUBLESHOOT AND FLOW CHK, BUT IT DIDN'T WORK. THEREFORE, I REQUESTED PRIORITY LNDG OVER THE CONCORD ARPT (BUCHANAN FIELD) AND LANDED ON RWY 19R. AFTER LNDG, CHKED MAGNETOS AND MIXTURE, ETC, BUT THE STUDENT AND I COULDN'T FIND OUT WHAT WAS WRONG. THE TEMP AT 3500 FT MSL WAS ABOUT 25 DEGS C. NO SIGNS OF CARB ICING, NO SIGNS OF MAGNETO PROBS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR ELABORATED THAT THE ENG ROUGHNESS RESULTED IN REDUCED PWR AVAILABILITY AND THAT HE REQUESTED PRIORITY LNDG CLRNC RATHER THAN DECLARE AN EMER BECAUSE HE FELT THAT FAILURE WAS NOT IMMINENT. THEY WERE UNABLE TO QUICKLY DETERMINE A CAUSE AFTER LNDG AND LEFT THE ACFT WITH A MAINT FACILITY. RPTR IS UNAWARE OF THE ULTIMATE EVALUATION OF THE PROB.

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.