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Widebody transport dumps fuel and return land nrt because of dual INS failure. Were the INS's loaded properly?
| Attributes | |
| ACN | 166057 |
| Time | |
| Date | 199012 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : nrt |
| State Reference | FO |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 4 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | climbout : intermediate altitude cruise other |
| Route In Use | enroute : pacific enroute : other oceanic enroute airway : rjtg |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 125 flight time total : 13500 flight time type : 1500 |
| ASRS Report | 166057 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Triple INS unreliability at time of transition to otw. Under radar contact requested rtb and fuel dump area. Approved. Dumped to below maximum landing weight. Replaced two INS'. Continued flight again when cleared by ground personnel and ATC. Second flight uneventful met by flight manager at arrival problem explained and released aircraft had had previous write up affecting INS.
Original NASA ASRS Text
Title: WDB DUMPS FUEL AND RETURN LAND NRT BECAUSE OF DUAL INS FAILURE. WERE THE INS'S LOADED PROPERLY?
Narrative: TRIPLE INS UNRELIABILITY AT TIME OF TRANSITION TO OTW. UNDER RADAR CONTACT REQUESTED RTB AND FUEL DUMP AREA. APPROVED. DUMPED TO BELOW MAX LNDG WEIGHT. REPLACED TWO INS'. CONTINUED FLT AGAIN WHEN CLRED BY GND PERSONNEL AND ATC. SEC FLT UNEVENTFUL MET BY FLT MGR AT ARR PROB EXPLAINED AND RELEASED ACFT HAD HAD PREVIOUS WRITE UP AFFECTING INS.
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.