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Widebody transport completing accuracy navigation check for transatlantic flight finds inertial navigation off by 3 degrees. Passenger using computer mouse.
| Attributes | |
| ACN | 258113 |
| Time | |
| Date | 199311 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : ory |
| State Reference | FO |
| Altitude | msl bound lower : 31000 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : kbo |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Route In Use | enroute : atlantic enroute : other oceanic enroute airway : lfff |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 7000 flight time type : 1500 |
| ASRS Report | 258113 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence other other anomaly other |
| Independent Detector | other flight crewa other other : unspecified |
| Resolutory Action | flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
In preparation for transoceanic flight, we conducted a system accuracy (navigation) check by flying over a VOR and comparing the inertial position at time of station passage with the charted VOR position. Over fray VOR we found the latitude coordinates within limits but the longitude position was 3 mins (3/60 degrees). Just then a flight attendant came in to report a passenger was complaining about our company rule prohibiting the use of a mouse. The so was sent back to explain the rule. The captain and I performed another check over the next VOR (after the so talked to the passenger) and it was a great check. The question of whether the mouse affected our vors arose. Both mark on tops looked good with quick needle swings and corresponding DME cpa's. What's alarming is that the company just announced a lifting of the ban on external mouses.
Original NASA ASRS Text
Title: WDB COMPLETING ACCURACY NAV CHK FOR TRANSATLANTIC FLT FINDS INERTIAL NAV OFF BY 3 DEGS. PAX USING COMPUTER MOUSE.
Narrative: IN PREPARATION FOR TRANSOCEANIC FLT, WE CONDUCTED A SYS ACCURACY (NAV) CHK BY FLYING OVER A VOR AND COMPARING THE INERTIAL POS AT TIME OF STATION PASSAGE WITH THE CHARTED VOR POS. OVER FRAY VOR WE FOUND THE LATITUDE COORDINATES WITHIN LIMITS BUT THE LONGITUDE POS WAS 3 MINS (3/60 DEGS). JUST THEN A FLT ATTENDANT CAME IN TO RPT A PAX WAS COMPLAINING ABOUT OUR COMPANY RULE PROHIBITING THE USE OF A MOUSE. THE SO WAS SENT BACK TO EXPLAIN THE RULE. THE CAPT AND I PERFORMED ANOTHER CHK OVER THE NEXT VOR (AFTER THE SO TALKED TO THE PAX) AND IT WAS A GREAT CHK. THE QUESTION OF WHETHER THE MOUSE AFFECTED OUR VORS AROSE. BOTH MARK ON TOPS LOOKED GOOD WITH QUICK NEEDLE SWINGS AND CORRESPONDING DME CPA'S. WHAT'S ALARMING IS THAT THE COMPANY JUST ANNOUNCED A LIFTING OF THE BAN ON EXTERNAL MOUSES.
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.