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A B737-300 on final approach at 3000 ft trailing edge flaps failed to extend from 2 units to 5 units. Executed go around.
| Attributes | |
| ACN | 517504 |
| Time | |
| Date | 200107 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : smf.airport |
| State Reference | CA |
| Altitude | msl single value : 3000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : sct.tracon tower : smf.tower artcc : zla.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer only : 16l other |
| Flight Phase | descent : approach landing : go around |
| Route In Use | approach : instrument non precision approach : visual |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : multi engine |
| Experience | flight time last 90 days : 160 flight time total : 16000 flight time type : 2573 |
| ASRS Report | 517504 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 27000 flight time type : 140 |
| ASRS Report | 517502 |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : flap position indicator other flight crewa other flight crewb |
| Resolutory Action | flight crew : executed go around |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
Cleared for visual approach by socal for runway 16L at smf, and handed over to tower at 3000 ft MSL on right down wind. PF-captain called for flaps 5-SELECTED 5 degree position and noted that we only had symmetrical 2 degree of te flaps-due to previous write-up and mx corrective action, we cycled flap lever full up then back to 5 degree position. With same 2 degree te resulting. While doing this we had asked for and received a downwind extension, plus handoff back to socal approach. Ran QRH and then updated flight system landing data for reduced flaps (1-15 degree), information from ATIS and landing weight 111.0-noted landing distance was not a factor-only bracket was for min braking. Turned back inbound for extended ILS final for runway 16L-approach and landing totally uneventful. We were totally unaware of damage done by flap until post flight inspection. Absolutely no cockpit indication of any problem except for reduced te flaps. Callback conversation with reporter revealed the following information: the reporter stated the cause of the trailing edge flap failure was caused by the #3 flap transmission. The reporter said maintenance advised the crew this was a very rare failure. The reporter said when the flap torque tubes rotated all flap transmissions to extend the flaps but the #3 flap did not move causing an asymmetrical shutoff.
Original NASA ASRS Text
Title: A B737-300 ON FINAL APCH AT 3000 FT TRAILING EDGE FLAPS FAILED TO EXTEND FROM 2 UNITS TO 5 UNITS. EXECUTED GAR.
Narrative: CLRED FOR VISUAL APCH BY SOCAL FOR RWY 16L AT SMF, AND HANDED OVER TO TWR AT 3000 FT MSL ON RIGHT DOWN WIND. PF-CAPT CALLED FOR FLAPS 5-SELECTED 5 DEG POSITION AND NOTED THAT WE ONLY HAD SYMMETRICAL 2 DEG OF TE FLAPS-DUE TO PREVIOUS WRITE-UP AND MX CORRECTIVE ACTION, WE CYCLED FLAP LEVER FULL UP THEN BACK TO 5 DEG POSITION. WITH SAME 2 DEG TE RESULTING. WHILE DOING THIS WE HAD ASKED FOR AND RECEIVED A DOWNWIND EXTENSION, PLUS HANDOFF BACK TO SOCAL APCH. RAN QRH AND THEN UPDATED FLT SYS LANDING DATA FOR REDUCED FLAPS (1-15 DEG), INFO FROM ATIS AND LANDING WT 111.0-NOTED LANDING DISTANCE WAS NOT A FACTOR-ONLY BRACKET WAS FOR MIN BRAKING. TURNED BACK INBOUND FOR EXTENDED ILS FINAL FOR RWY 16L-APCH AND LANDING TOTALLY UNEVENTFUL. WE WERE TOTALLY UNAWARE OF DAMAGE DONE BY FLAP UNTIL POST FLT INSPECTION. ABSOLUTELY NO COCKPIT INDICATION OF ANY PROBLEM EXCEPT FOR REDUCED TE FLAPS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE CAUSE OF THE TRAILING EDGE FLAP FAILURE WAS CAUSED BY THE #3 FLAP TRANSMISSION. THE RPTR SAID MAINT ADVISED THE CREW THIS WAS A VERY RARE FAILURE. THE RPTR SAID WHEN THE FLAP TORQUE TUBES ROTATED ALL FLAP TRANSMISSIONS TO EXTEND THE FLAPS BUT THE #3 FLAP DID NOT MOVE CAUSING AN ASYMMETRICAL SHUTOFF.
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.