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While level at FL390; B737NG crew reported a failure of the right IRS which resulted in the loss of all navigation and flight instruments. After completion of the QRH checklist and recovery of flight display data the crew returned to the departure airport.
| Attributes | |
| ACN | 1473230 |
| Time | |
| Date | 201708 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737 Next Generation Undifferentiated |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | INS / IRS / IRU |
| 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 Critical |
Narrative:
At FL390 the autopilot kicked off and we noticed our heading; attitude; navigation system on both the captain and first officer (first officer) side went blank as well as standby HSI had off flags. We looked up and noticed the right IRS (inertial reference system) fault light was illuminated. At approximately 100 miles from [the departure airport]; we elected to turn back around and returned. We [advised ATC]; due to lack of navigation system and no heading information. I was getting no-gyro vectors from ATC as first officer ran the IRS fault checklist. Upon completing the checklist we were able to get an attitude and heading information back; however; we still were missing our navigation data. With help from ATC we were able to safely navigate back to [the airport] where it was VFR and landed uneventfully.
Original NASA ASRS Text
Title: While level at FL390; B737NG crew reported a failure of the right IRS which resulted in the loss of all navigation and flight instruments. After completion of the QRH checklist and recovery of flight display data the crew returned to the departure airport.
Narrative: At FL390 the autopilot kicked off and we noticed our heading; attitude; navigation system on both the Captain and F/O (First Officer) side went blank as well as standby HSI had off flags. We looked up and noticed the right IRS (Inertial Reference System) fault light was illuminated. At approximately 100 miles from [the departure airport]; we elected to turn back around and returned. We [advised ATC]; due to lack of navigation system and no heading information. I was getting no-gyro vectors from ATC as F/O ran the IRS fault checklist. Upon completing the checklist we were able to get an attitude and heading information back; however; we still were missing our navigation data. With help from ATC we were able to safely navigate back to [the airport] where it was VFR and landed 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.