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B777 flight reported autothrottles drove thrust to full power on approach after flaps 25 were selected. Autothrottles would re-engage even when disconnected until autothrottle arm switches were turned off.
| Attributes | |
| ACN | 1061886 |
| Time | |
| Date | 201301 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B777-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Autothrottle/Speed Control |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | Relief Pilot First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
On VNAV/LNAV approach 22L when 25 flaps selected autothrottles (a/T) commanded full power and repeatedly re-engaged when disconnected. Attempted to continue approach overriding a/T but did a missed approach. Toga appeared to function normally. Same thing reoccurred on second approach ILS 22R. Turned off a/T arm switches and landed using manual throttles. On both approaches flight director & autopilot correctly followed VNAV & ILS commands.
Original NASA ASRS Text
Title: B777 flight reported autothrottles drove thrust to full power on approach after flaps 25 were selected. Autothrottles would re-engage even when disconnected until autothrottle arm switches were turned off.
Narrative: On VNAV/LNAV approach 22L when 25 flaps selected autothrottles (A/T) commanded full power and repeatedly re-engaged when disconnected. Attempted to continue approach overriding A/T but did a missed approach. TOGA appeared to function normally. Same thing reoccurred on second approach ILS 22R. Turned off A/T arm switches and landed using manual throttles. On both approaches Flight Director & autopilot correctly followed VNAV & ILS commands.
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.