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A crossing restr was not met, because the flight crew failed to detect an error in INS distance data. The INS information did not correspond with actual distance information.
| Attributes | |
| ACN | 297777 |
| Time | |
| Date | 199502 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : lax |
| State Reference | CA |
| Altitude | msl bound lower : 10000 msl bound upper : 13500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dawn |
| Aircraft 1 | |
| Controlling Facilities | tower : oma |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star enroute airway : lax |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 16000 flight time type : 2000 |
| ASRS Report | 297777 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : flight engineer pilot : atp |
| ASRS Report | 297729 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : undershoot non adherence : clearance other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Downe 4 arrival. To cross baset at 10000 ft, using INS with VOR, as a backup. Prior to baset, INS and VOR/DME crosschecked, ok. Descending at 3000 FPM, using INS time to baset, we were to be at 10000 ft 1 min prior to baset. At approximately 13500 ft noticed the DME reading 19, baset DME is 23. According to the DME we were inside of baset, (the INS, showed us outside). ATC gave us direct smo VOR. On ground, we confirmed all waypoints against commercial chart, downe 4 arrival. They all were entered correctly.
Original NASA ASRS Text
Title: A XING RESTR WAS NOT MET, BECAUSE THE FLC FAILED TO DETECT AN ERROR IN INS DISTANCE DATA. THE INS INFO DID NOT CORRESPOND WITH ACTUAL DISTANCE INFO.
Narrative: DOWNE 4 ARR. TO CROSS BASET AT 10000 FT, USING INS WITH VOR, AS A BACKUP. PRIOR TO BASET, INS AND VOR/DME XCHKED, OK. DSNDING AT 3000 FPM, USING INS TIME TO BASET, WE WERE TO BE AT 10000 FT 1 MIN PRIOR TO BASET. AT APPROX 13500 FT NOTICED THE DME READING 19, BASET DME IS 23. ACCORDING TO THE DME WE WERE INSIDE OF BASET, (THE INS, SHOWED US OUTSIDE). ATC GAVE US DIRECT SMO VOR. ON GND, WE CONFIRMED ALL WAYPOINTS AGAINST COMMERCIAL CHART, DOWNE 4 ARR. THEY ALL WERE ENTERED CORRECTLY.
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.