|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||1801 To 2400|
|Locale Reference||airport : jef.airport|
|Altitude||agl single value : 300|
|Controlling Facilities||tower : jef.tower|
|Operator||general aviation : personal|
|Make Model Name||Cessna 150|
|Operating Under FAR Part||Part 91|
|Flight Phase||climbout : takeoff|
|Function||instruction : instructor|
|Qualification||pilot : commercial|
pilot : cfi
|Experience||flight time last 90 days : 50|
flight time total : 460
flight time type : 20
|Function||instruction : trainee|
|Anomaly||aircraft equipment problem : critical|
|Independent Detector||other flight crewa|
|Resolutory Action||flight crew : diverted to another airport|
Flight Crew Human Performance
During the execution of a short field landing my student retracted the flaps to the 0 degree position. After the aircraft has stopped; he executed a soft field takeoff with 4900 ft of runway that remained ahead. A soft field takeoff in a C150 requires 10 degrees of flaps; so 10 degrees of flaps was applied. During the takeoff; the student drifted above ground effect and the plane could not climb at a sufficient rate to fly the normal pattern. After the plane was approximately 300 ft AGL and crossing the end of the runway; I took the plane because a positive rate of climb was not established. I quickly recognized that the flaps were stuck in the almost full down position which was causing for such poor climb performance. I quickly checked circuit breakers and recycled the flap lever; but flaps did not move. The only option was to circle back for the runway I departed on at an altitude of 300 ft AGL. I called tower and explained the situation and was cleared to land on runway 30 -- the opposite that I had departed from. After securing the airplane I had figured out that the flaps did not retract but only 5 or so degrees after executing the short field landing. My suggestion is to restrict the inspection tolerances on the flap system of the C150 or to figure a way to fix this problem. From what I hear; the flaps fail frequently on this type of aircraft.
Original NASA ASRS Text
Title: C150 FLAPS DO NOT FULLY RETRACT WHILE PRACTICING SOFT FIELD LNDGS.
Narrative: DURING THE EXECUTION OF A SHORT FIELD LNDG MY STUDENT RETRACTED THE FLAPS TO THE 0 DEG POS. AFTER THE ACFT HAS STOPPED; HE EXECUTED A SOFT FIELD TKOF WITH 4900 FT OF RWY THAT REMAINED AHEAD. A SOFT FIELD TKOF IN A C150 REQUIRES 10 DEGS OF FLAPS; SO 10 DEGS OF FLAPS WAS APPLIED. DURING THE TKOF; THE STUDENT DRIFTED ABOVE GND EFFECT AND THE PLANE COULD NOT CLB AT A SUFFICIENT RATE TO FLY THE NORMAL PATTERN. AFTER THE PLANE WAS APPROX 300 FT AGL AND XING THE END OF THE RWY; I TOOK THE PLANE BECAUSE A POSITIVE RATE OF CLB WAS NOT ESTABLISHED. I QUICKLY RECOGNIZED THAT THE FLAPS WERE STUCK IN THE ALMOST FULL DOWN POS WHICH WAS CAUSING FOR SUCH POOR CLB PERFORMANCE. I QUICKLY CHKED CIRCUIT BREAKERS AND RECYCLED THE FLAP LEVER; BUT FLAPS DID NOT MOVE. THE ONLY OPTION WAS TO CIRCLE BACK FOR THE RWY I DEPARTED ON AT AN ALT OF 300 FT AGL. I CALLED TWR AND EXPLAINED THE SIT AND WAS CLRED TO LAND ON RWY 30 -- THE OPPOSITE THAT I HAD DEPARTED FROM. AFTER SECURING THE AIRPLANE I HAD FIGURED OUT THAT THE FLAPS DID NOT RETRACT BUT ONLY 5 OR SO DEGS AFTER EXECUTING THE SHORT FIELD LNDG. MY SUGGESTION IS TO RESTRICT THE INSPECTION TOLERANCES ON THE FLAP SYS OF THE C150 OR TO FIGURE A WAY TO FIX THIS PROB. FROM WHAT I HEAR; THE FLAPS FAIL FREQUENTLY ON THIS TYPE OF ACFT.
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.