|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||1801 To 2400|
|Locale Reference||atc facility : sax|
airport : ewr
|Altitude||msl bound lower : 7000|
msl bound upper : 10000
|Controlling Facilities||tracon : n90|
|Operator||common carrier : air carrier|
|Make Model Name||Medium Large Transport, Low Wing, 2 Turbojet Eng|
|Navigation In Use||Other|
|Flight Phase||descent other|
|Affiliation||company : air carrier|
|Function||flight crew : captain|
oversight : pic
|Qualification||pilot : atp|
|Experience||flight time last 90 days : 150|
flight time total : 15000
|Function||flight crew : first officer|
|Qualification||pilot : instrument|
pilot : commercial
|Anomaly||altitude deviation : crossing restriction not met|
non adherence : clearance
|Independent Detector||other controllera|
|Resolutory Action||none taken : detected after the fact|
|Primary Problem||Flight Crew Human Performance|
|Air Traffic Incident||Pilot Deviation|
We were cleared to cross 25 miles northeast sax VOR at 7000' MSL. Inserted downtrack fix in computer of medium large transport checked by both pilot and copilot for accuracy. We became involved in approach operation and did not notice computer fix change from 25 mi to 16 mi. We missed crossing restriction by 3000'. I did not realize we had missed restriction until approach control said he would like us to tell him the next time we couldn't make the crossing restriction. I learned not to have so much faith in computers.
Original NASA ASRS Text
Title: FAILED TO MAKE CROSSING RESTRICTION WHEN FMC DROPPED THE DME DISTANCE.
Narrative: WE WERE CLRED TO CROSS 25 MILES NE SAX VOR AT 7000' MSL. INSERTED DOWNTRACK FIX IN COMPUTER OF MLG CHKED BY BOTH PLT AND COPLT FOR ACCURACY. WE BECAME INVOLVED IN APCH OPERATION AND DID NOT NOTICE COMPUTER FIX CHANGE FROM 25 MI TO 16 MI. WE MISSED XING RESTRICTION BY 3000'. I DID NOT REALIZE WE HAD MISSED RESTRICTION UNTIL APCH CTL SAID HE WOULD LIKE US TO TELL HIM THE NEXT TIME WE COULDN'T MAKE THE XING RESTRICTION. I LEARNED NOT TO HAVE SO MUCH FAITH IN COMPUTERS.
Data retrieved from NASA's ASRS site as of August 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.