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MD80 flight crew has rnp warning along with failure of both IRS units; declared emergency and diverted for landing.
| Attributes | |
| ACN | 697580 |
| Time | |
| Date | 200605 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl single value : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zzz.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : initial cruise : level descent : approach |
| Route In Use | approach : visual arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 697580 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| ASRS Report | 697581 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : eicas warning other flight crewa other flight crewb |
| Resolutory Action | controller : provided flight assist flight crew : declared emergency flight crew : diverted to another airport flight crew : overcame equipment problem flight crew : landed as precaution |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Aircraft |
Narrative:
During climb out from ZZZ1 we had an rnp light come on indicating a possible navigation system error. Found rnp varied up to 18 mi. Confirmed navigation error with aircraft VOR's and ATC. Worked problem until over ZZZ2 VOR. Tried to update IRS's; but both system dumped. We lost all primary navigation and attitude displays. Declared an emergency while descending out of FL310 and diverted to ZZZ2. ATC gave us no-gyro vectors to a VFR landing. Overweight landing was uneventful.
Original NASA ASRS Text
Title: MD80 FLT CREW HAS RNP WARNING ALONG WITH FAILURE OF BOTH IRS UNITS; DECLARED EMER AND DIVERTED FOR LNDG.
Narrative: DURING CLBOUT FROM ZZZ1 WE HAD AN RNP LIGHT COME ON INDICATING A POSSIBLE NAV SYS ERROR. FOUND RNP VARIED UP TO 18 MI. CONFIRMED NAV ERROR WITH ACFT VOR'S AND ATC. WORKED PROB UNTIL OVER ZZZ2 VOR. TRIED TO UPDATE IRS'S; BUT BOTH SYS DUMPED. WE LOST ALL PRIMARY NAV AND ATTITUDE DISPLAYS. DECLARED AN EMER WHILE DSNDING OUT OF FL310 AND DIVERTED TO ZZZ2. ATC GAVE US NO-GYRO VECTORS TO A VFR LNDG. OVERWT LNDG WAS UNEVENTFUL.
Data retrieved from NASA's ASRS site as of January 2009 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.