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B737-800 flight crew reported that their aircraft did not make the turn to 163 degrees at hethr on the GLASR1 arrival to sea. Heading select was engaged with no effect then the auto pilot was disengaged and the aircraft turned manually.
| Attributes | |
| ACN | 1451769 |
| Time | |
| Date | 201705 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | SEA.Airport |
| State Reference | WA |
| Aircraft 1 | |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | MCP |
| Person 1 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| 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 - Track / Heading All Types |
Narrative:
While flying the glasr one arrival into sea; the LNAV appeared to malfunction and didn't make the turn to 163 degrees at the hethr intersection. I proceeded to select heading to have the autopilot make the turn. The heading select button was unresponsive. I then disconnected the autopilot and made the turn. While in the turn; approach asked about our heading.
Original NASA ASRS Text
Title: B737-800 flight crew reported that their aircraft did not make the turn to 163 degrees at HETHR on the GLASR1 arrival to SEA. Heading select was engaged with no effect then the auto pilot was disengaged and the aircraft turned manually.
Narrative: While flying the GLASR ONE Arrival into SEA; the LNAV appeared to malfunction and didn't make the turn to 163 degrees at the HETHR intersection. I proceeded to select heading to have the autopilot make the turn. The heading select button was unresponsive. I then disconnected the autopilot and made the turn. While in the turn; Approach asked about our heading.
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.