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Aircraft navigation system failed. Flight crew involved in abnormal procedures trying to troubleshoot navigation failure, fails to reset altimeter to qnh.
| Attributes | |
| ACN | 546266 |
| Time | |
| Date | 200205 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | intersection : hayed |
| State Reference | NY |
| Altitude | msl single value : 12000 |
| Environment | |
| Flight Conditions | Marginal |
| Weather Elements | Turbulence |
| Aircraft 1 | |
| Controlling Facilities | tracon : n90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : approach |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : multi engine pilot : commercial |
| Experience | flight time last 90 days : 240 flight time total : 7000 flight time type : 3000 |
| ASRS Report | 546266 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot non adherence : far non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : provided flight assist flight crew : overcame equipment problem |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Descending on an arrival, cleared to cross hayed at FL190. Approximately FL220, both FMS's failed. Informed center, then cleared to 13000 ft and radar vectors. Captain was flying. Both called 14000 ft for 13000 ft, as aircraft was leveling, I called altimeter to 29.47 (approximately). Reset altimeters, and we were low. During this, center cleared us to 7000 ft almost a non-stop at 13000 ft. My running abnormal and setting up vors and reprogramming the FMS were contributing factors.
Original NASA ASRS Text
Title: ACFT NAV SYS FAILED. FLC INVOLVED IN ABNORMAL PROCS TRYING TO TROUBLESHOOT NAV FAILURE, FAILS TO RESET ALTIMETER TO QNH.
Narrative: DSNDING ON AN ARR, CLRED TO CROSS HAYED AT FL190. APPROX FL220, BOTH FMS'S FAILED. INFORMED CTR, THEN CLRED TO 13000 FT AND RADAR VECTORS. CAPT WAS FLYING. BOTH CALLED 14000 FT FOR 13000 FT, AS ACFT WAS LEVELING, I CALLED ALTIMETER TO 29.47 (APPROX). RESET ALTIMETERS, AND WE WERE LOW. DURING THIS, CTR CLRED US TO 7000 FT ALMOST A NON-STOP AT 13000 FT. MY RUNNING ABNORMAL AND SETTING UP VORS AND REPROGRAMMING THE FMS WERE CONTRIBUTING FACTORS.
Data retrieved from NASA's ASRS site as of July 2007 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.