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B737-800 captain experiences the loss of a single IRS on an over water flight; just past the mid point; and continues to destination.
| Attributes | |
| ACN | 1090158 |
| Time | |
| Date | 201305 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Component | |
| Aircraft Component | INS / IRS / IRU |
| Person 1 | |
| Function | Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
After the mid point we got an FMC message 'verify pos: IRS IRS.' we checked the position shift page; left IRS was at 26 NM and increasing. All other positions were within limits. ATC and dispatch were notified at that time. Anp never was larger than 0.02. We referenced the flight handbook supplemental procedures section. In addition we made several extra plots using the right IRS from the overhead panel as a backup on our position. Aircraft position was never in doubt. Once over land we got an IRS fault with loss of the captains pfd. We ran the QRH and made an un-eventful landing. An emergency was declared with ATC after failure of the left IRS with the loss of the captains pfd.
Original NASA ASRS Text
Title: B737-800 Captain experiences the loss of a single IRS on an over water flight; just past the mid point; and continues to destination.
Narrative: After the mid point we got an FMC message 'Verify Pos: IRS IRS.' We checked the POS SHIFT page; left IRS was at 26 NM and increasing. All other positions were within limits. ATC and Dispatch were notified at that time. ANP never was larger than 0.02. We referenced the Flight Handbook Supplemental Procedures section. In addition we made several extra plots using the right IRS from the overhead panel as a backup on our position. Aircraft position was never in doubt. Once over land we got an IRS fault with loss of the Captains PFD. We ran the QRH and made an un-eventful landing. An Emergency was declared with ATC after failure of the left IRS with the loss of the Captains PFD.
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.