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Flight crew of air carrier medium large transport misses crossing restriction at cofax intersection due to misreading of DME distance from chart.
| Attributes | |
| ACN | 140205 |
| Time | |
| Date | 199003 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : jst |
| State Reference | PA |
| Altitude | msl bound lower : 20000 msl bound upper : 20000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | other vortac |
| Flight Phase | descent other |
| Route In Use | enroute airway : j152 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 160 flight time total : 14648 flight time type : 160 |
| ASRS Report | 140205 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | altitude deviation : crossing restriction not met altitude deviation : undershoot non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | none taken : detected after the fact none taken : unable |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
I missed an ATC assigned crossing restriction. We were told to cross cofax intersection at 17000' on J152. Cofax intersection is 40 DME east of johnstown VORTAC on J152. Using the high altitude 4 chart, I looked at the chart and added up the DME mileage of 22 DME and 40 DME and came up with 62 DME for cofax intersection. I was very tired at the time and made an honest human error. We were eastbound from chicago to phl at that time. I called the ATC center supervisor from philadelphia (ZNY) and told him it was my fault completely and what I had done, and he said not to worry, that there was no traffic conflict and that the 'snitch machine' went off.
Original NASA ASRS Text
Title: FLT CREW OF ACR MLG MISSES CROSSING RESTRICTION AT COFAX INTERSECTION DUE TO MISREADING OF DME DISTANCE FROM CHART.
Narrative: I MISSED AN ATC ASSIGNED XING RESTRICTION. WE WERE TOLD TO CROSS COFAX INTXN AT 17000' ON J152. COFAX INTXN IS 40 DME E OF JOHNSTOWN VORTAC ON J152. USING THE HIGH ALT 4 CHART, I LOOKED AT THE CHART AND ADDED UP THE DME MILEAGE OF 22 DME AND 40 DME AND CAME UP WITH 62 DME FOR COFAX INTXN. I WAS VERY TIRED AT THE TIME AND MADE AN HONEST HUMAN ERROR. WE WERE EBND FROM CHICAGO TO PHL AT THAT TIME. I CALLED THE ATC CENTER SUPVR FROM PHILADELPHIA (ZNY) AND TOLD HIM IT WAS MY FAULT COMPLETELY AND WHAT I HAD DONE, AND HE SAID NOT TO WORRY, THAT THERE WAS NO TFC CONFLICT AND THAT THE 'SNITCH MACHINE' WENT OFF.
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.