 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
After departure md-83 crew declared an emergency due to flight guidance system issues; returned to the departure airport and landed overweight.
| Attributes | |
| ACN | 1067196 |
| Time | |
| Date | 201302 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | MD-83 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Flight Dynamics Navigation and Safety |
| Person 1 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
After takeoff the first officer and I lost the first and third windows of the flight mode annunciations; both flight directors locked up and the autothrottle and autopilot would not engage. Both digital flight guidance system 1 and 2 were tested. It was immediately obvious that we would not be able to navigate because the two digital flight guidance systems were commanding different headings. I was concerned that I would also lose both primary flight displays and their primary gyros. We declared an emergency; requested and received radar vectors hand flying back to our departure airfield with compass; altimeter and vsi for a landing. For the safety of my passengers; crew and I decided to land 5;000 pounds overweight rather than risk losing both primary flight gyros also. This was the second time in three days this happened to this aircraft.
Original NASA ASRS Text
Title: After departure MD-83 crew declared an emergency due to Flight Guidance System issues; returned to the departure airport and landed overweight.
Narrative: After takeoff the First Officer and I lost the first and third windows of the Flight Mode Annunciations; both flight directors locked up and the autothrottle and autopilot would not engage. Both Digital Flight Guidance System 1 and 2 were tested. It was immediately obvious that we would not be able to navigate because the two Digital Flight Guidance systems were commanding different headings. I was concerned that I would also lose both Primary Flight Displays and their Primary Gyros. We declared an emergency; requested and received radar vectors hand flying back to our departure airfield with compass; altimeter and VSI for a landing. For the safety of my passengers; crew and I decided to land 5;000 LBS overweight rather than risk losing both primary flight gyros also. This was the second time in three days this happened to this aircraft.
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.