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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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An air carrier B737 flight crew misreads their DME and does not start a descent in time to make a crossing assignment. An ARTCC radar controller has to vector them off track to accomplish a conflict-free descent.
| Attributes | |
| ACN | 347940 |
| Time | |
| Date | 199609 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : jot |
| State Reference | IL |
| Altitude | msl bound lower : 16000 msl bound upper : 25000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 270 flight time total : 8500 flight time type : 4100 |
| ASRS Report | 347940 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time last 90 days : 230 flight time total : 8500 |
| ASRS Report | 348244 |
| Events | |
| Anomaly | altitude deviation : crossing restriction not met altitude deviation : undershoot non adherence : far non adherence : clearance other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Our flight crew was flying direct to joliet VOR at 25000 ft and was given clearance to be at 16000 ft 60 mi southwest of joliet VOR. We started our descent too late because we misread the DME since one VOR was set on a different station. ZAU saw our mistake as we started down and stopped our descent at 23000 ft and vectored us 50 degrees left since we were past the assigned point 60 mi southwest of joliet and still too high. The vectored route steered us clear of traffic (which we never saw) and we continued our descent/flight to mdw with no further incident.
Original NASA ASRS Text
Title: AN ACR B737 FLC MISREADS THEIR DME AND DOES NOT START A DSCNT IN TIME TO MAKE A XING ASSIGNMENT. AN ARTCC RADAR CTLR HAS TO VECTOR THEM OFF TRACK TO ACCOMPLISH A CONFLICT-FREE DSCNT.
Narrative: OUR FLC WAS FLYING DIRECT TO JOLIET VOR AT 25000 FT AND WAS GIVEN CLRNC TO BE AT 16000 FT 60 MI SW OF JOLIET VOR. WE STARTED OUR DSCNT TOO LATE BECAUSE WE MISREAD THE DME SINCE ONE VOR WAS SET ON A DIFFERENT STATION. ZAU SAW OUR MISTAKE AS WE STARTED DOWN AND STOPPED OUR DSCNT AT 23000 FT AND VECTORED US 50 DEGS L SINCE WE WERE PAST THE ASSIGNED POINT 60 MI SW OF JOLIET AND STILL TOO HIGH. THE VECTORED RTE STEERED US CLR OF TFC (WHICH WE NEVER SAW) AND WE CONTINUED OUR DSCNT/FLT TO MDW WITH NO FURTHER INCIDENT.
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.