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B737-700 on final approach trailing edge flaps stuck short of 25 units. Landed uneventfully. Cause of failure unknown.
| Attributes | |
| ACN | 567899 |
| Time | |
| Date | 200212 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : sea.airport |
| State Reference | WA |
| Altitude | msl single value : 1500 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tower : sea.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial |
| Experience | flight time last 90 days : 230 flight time total : 4600 |
| ASRS Report | 567899 |
| Person 2 | |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 15100 flight time type : 9500 |
| ASRS Report | 568026 |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : t.e. flaps position indication other flight crewa other flight crewb |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Chart Or Publication Aircraft Flight Crew Human Performance |
| Primary Problem | Aircraft |
Narrative:
On final approach, flaps stuck just short of flaps 25 degrees. Tried to recycle flaps, but flaps remained at 25. We ran the appropriate items out of the symmetrical non-normal trailing edge flaps or no flaps checklist, contacted maintenance and chief pilot on call. We landed flaps 25 degrees on runway 16L uneventfully. Because of the nature of this malfunction, stuck flaps beyond 15 degrees, it is not initially clear what items are applicable and what items are not. I think a simple note added concerning stuck flaps greater than 15 degrees to the note page steering you to note #5 (speed for configns) would make this checklist more effective and less confusing. Callback conversation with reporter revealed the following information: the reporter stated the cause of the flaps stuck short of 25 degree units is unknown as maintenance has not advised the crew of the maintenance action. The reporter said the alternate flap system was not used as the airplane was landable with 25 degree flaps.
Original NASA ASRS Text
Title: B737-700 ON FINAL APCH TRAILING EDGE FLAPS STUCK SHORT OF 25 UNITS. LANDED UNEVENTFULLY. CAUSE OF FAILURE UNKNOWN.
Narrative: ON FINAL APCH, FLAPS STUCK JUST SHORT OF FLAPS 25 DEGS. TRIED TO RECYCLE FLAPS, BUT FLAPS REMAINED AT 25. WE RAN THE APPROPRIATE ITEMS OUT OF THE SYMMETRICAL NON-NORMAL TRAILING EDGE FLAPS OR NO FLAPS CHKLIST, CONTACTED MAINT AND CHIEF PLT ON CALL. WE LANDED FLAPS 25 DEGS ON RWY 16L UNEVENTFULLY. BECAUSE OF THE NATURE OF THIS MALFUNCTION, STUCK FLAPS BEYOND 15 DEGS, IT IS NOT INITIALLY CLR WHAT ITEMS ARE APPLICABLE AND WHAT ITEMS ARE NOT. I THINK A SIMPLE NOTE ADDED CONCERNING STUCK FLAPS GREATER THAN 15 DEGS TO THE NOTE PAGE STEERING YOU TO NOTE #5 (SPD FOR CONFIGNS) WOULD MAKE THIS CHKLIST MORE EFFECTIVE AND LESS CONFUSING. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE CAUSE OF THE FLAPS STUCK SHORT OF 25 DEG UNITS IS UNKNOWN AS MAINT HAS NOT ADVISED THE CREW OF THE MAINT ACTION. THE RPTR SAID THE ALTERNATE FLAP SYS WAS NOT USED AS THE AIRPLANE WAS LANDABLE WITH 25 DEG FLAPS.
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.