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B747-200 captain reported outboard flaps showed a split and did not fully extend on approach. Possible stuck indicator freed itself on taxi in; allowing flaps to extend.
| Attributes | |
| ACN | 1015110 |
| Time | |
| Date | 201206 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B747-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Flap/Slat Indication |
| Person 1 | |
| Function | Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Inflight Event / Encounter Fuel Issue |
Narrative:
Inside of thirty miles; started configuring aircraft for approach and landing. Selecting 5 deg of flaps with lever; noticed outboard flaps indicator split with one needle stuck at approximately 3 deg and the other needle oscillated back and forth between 3 and 10 degrees before settling at 10 deg. No asymmetric roll was noted at this time. Continued to configure for a flap 30 landing; with the outboard flap indicator stuck in a split condition. Needles were stuck in the 3 and 10 degree position. It was apparent that the outboard flaps had not extended due to the increased nose up pitch during approach. Due to landing with less than flight plan fuel; we elected to add 20 KTS to vref to ensure controllability and continued approach and landed uneventfully. Left flaps extended after landing for maintenance to verify flap position. During taxi in; the stuck indicator somehow freed itself; and the outboard flaps extended. Cause: possible malfunctioning flap indicator.
Original NASA ASRS Text
Title: B747-200 Captain reported outboard flaps showed a split and did not fully extend on approach. Possible stuck indicator freed itself on taxi in; allowing flaps to extend.
Narrative: Inside of thirty miles; started configuring aircraft for approach and landing. Selecting 5 deg of flaps with lever; noticed outboard flaps indicator split with one needle stuck at approximately 3 deg and the other needle oscillated back and forth between 3 and 10 degrees before settling at 10 deg. No asymmetric roll was noted at this time. Continued to configure for a flap 30 landing; with the outboard flap indicator stuck in a split condition. Needles were stuck in the 3 and 10 degree position. It was apparent that the outboard flaps had not extended due to the increased nose up pitch during approach. Due to landing with less than flight plan fuel; we elected to add 20 KTS to Vref to ensure controllability and continued approach and landed uneventfully. Left flaps extended after landing for Maintenance to verify flap position. During taxi in; the stuck indicator somehow freed itself; and the outboard flaps extended. Cause: Possible malfunctioning flap indicator.
Data retrieved from NASA's ASRS site as of July 2013 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.