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B737NG first officer reported a track deviation occurred departing lax after the flight director bar disappeared.
| Attributes | |
| ACN | 1677316 |
| Time | |
| Date | 201908 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | LAX.Airport |
| State Reference | CA |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B737 Next Generation Undifferentiated |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Component | |
| Aircraft Component | Flight Director |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine |
| Experience | Flight Crew Last 90 Days 194.8 Flight Crew Type 633.12 |
| Events | |
| Anomaly | Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Deviation - Track / Heading All Types Inflight Event / Encounter Wake Vortex Encounter |
Narrative:
Departing lax from [runway] 25R on the orcka 3 RNAV SID. On initial climb and somewhere around the dockr intersection; my flight director bar disappeared. Because of this; I cannot say with complete confidence that we made the required turn to 236 degrees at dockr as required per the RNAV SID. We did make the left turn as soon as possible without LNAV or flight director and used the heading bug as a reference. I do not know what caused LNAV/VNAV to disengage. We did encounter changes in pitch; roll and airspeed about that moment commensurate with a minor wake turbulence encounter. However; I do not believe this was related to the loss of LNAV/VNAV but did contribute to the overall confusion of the situation. We were able to re-engage LNAV/VNAV and also autopilot and the departure continued uneventfully.
Original NASA ASRS Text
Title: B737NG First Officer reported a track deviation occurred departing LAX after the flight director bar disappeared.
Narrative: Departing LAX from [Runway] 25R on the ORCKA 3 RNAV SID. On initial climb and somewhere around the DOCKR intersection; my flight director bar disappeared. Because of this; I cannot say with complete confidence that we made the required turn to 236 degrees at DOCKR as required per the RNAV SID. We did make the left turn as soon as possible without LNAV or flight director and used the heading bug as a reference. I do not know what caused LNAV/VNAV to disengage. We did encounter changes in pitch; roll and airspeed about that moment commensurate with a minor wake turbulence encounter. However; I do not believe this was related to the loss of LNAV/VNAV but did contribute to the overall confusion of the situation. We were able to re-engage LNAV/VNAV and also autopilot and the departure continued uneventfully.
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.