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In VMC conditions; a B777 captain on approach to lhr runway 27R disengaged the autopilot after the localizer activated then attempted a turned to a 360 heading instead of 271 to track the localizer. With autopilot off and while hand flying; the same anomaly occurred. After landing a FMC message rw ILS error was displayed.
| Attributes | |
| ACN | 1174346 |
| Time | |
| Date | 201405 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | EGLL.Airport |
| State Reference | FO |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B777 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | ILS/VOR |
| Person 1 | |
| Function | Captain Pilot Flying |
| Person 2 | |
| Function | Pilot Not Flying First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Deviation - Track / Heading All Types |
Narrative:
Landing 27R egll weather VFR on vector of 295 to intercept course localizer came alive tuned to irr at intercept capture the course changed to 360 and autopilot steered 360. I disengaged the autopilot and turned back to course. At that time ATC advised use to turn left to 245 to re-intercept 27R. I re-armed the ILS and it did the same when the course captured but I was hand flying this time. I asked ATC if the ILS was malfunctioning and was told it was normal. Landed without incident. On taxi in we got a FMC message rw ILS error the ILS was tuned to irr which is the correct identify for 27R but the course said 360 which should have been 271. We wrote it up and advised maintenance personnel at the gate.
Original NASA ASRS Text
Title: In VMC conditions; a B777 Captain on approach to LHR Runway 27R disengaged the autopilot after the LOC activated then attempted a turned to a 360 heading instead of 271 to track the localizer. With autopilot OFF and while hand flying; the same anomaly occurred. After landing a FMC message RW ILS ERROR was displayed.
Narrative: Landing 27R EGLL weather VFR on vector of 295 to intercept course LOC came alive tuned to IRR at intercept capture the course changed to 360 and autopilot steered 360. I disengaged the autopilot and turned back to course. At that time ATC advised use to turn left to 245 to re-intercept 27R. I re-armed the ILS and it did the same when the course captured but I was hand flying this time. I asked ATC if the ILS was malfunctioning and was told it was normal. Landed without incident. On taxi in we got a FMC message RW ILS ERROR the ILS was tuned to IRR which is the correct IDENT for 27R but the course said 360 which should have been 271. We wrote it up and advised Maintenance personnel at the gate.
Data retrieved from NASA's ASRS site 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.