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A canadair CL65 on descent at 11000 ft had the DME jump from 20 mi to 10 mi resulting in missing an intersection 2 mi late. Crew suspects cabin passenger electronics and not the autoplt as reported.
| Attributes | |
| ACN | 409085 |
| Time | |
| Date | 199807 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : abb |
| State Reference | IN |
| Altitude | msl bound lower : 11000 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | common carrier : air carrier |
| Make Model Name | Challenger CL604 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | enroute airway : zid |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 8800 flight time type : 800 |
| ASRS Report | 409085 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : cfi |
| Experience | flight time last 90 days : 150 flight time total : 2300 flight time type : 400 |
| ASRS Report | 408790 |
| Events | |
| Anomaly | altitude deviation : undershoot altitude deviation : crossing restriction not met non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
FMS DME jumped from 20 mi to 10 mi in a matter of seconds. We responded by increasing our descent rate to approximately 4000 FPM. Crossed sargo 2 mi late. Clearance was to cross sargo at 11000 ft, we crossed at 12000 ft. Additionally, the FMS led the autoplt 2 mi south of course (approaching sargo) before the crew returned to the proper course. No ATC queries were received. Callback conversation with reporter revealed the following information: the reporter stated the aircraft was a canadair CL65 and the DME performed normally after the 20 mi to 10 mi jump and no write-up was necessary. The reporter suspects the anomaly in the DME was caused by passenger personal electronic units.
Original NASA ASRS Text
Title: A CANADAIR CL65 ON DSCNT AT 11000 FT HAD THE DME JUMP FROM 20 MI TO 10 MI RESULTING IN MISSING AN INTXN 2 MI LATE. CREW SUSPECTS CABIN PAX ELECTRONICS AND NOT THE AUTOPLT AS RPTED.
Narrative: FMS DME JUMPED FROM 20 MI TO 10 MI IN A MATTER OF SECONDS. WE RESPONDED BY INCREASING OUR DSCNT RATE TO APPROX 4000 FPM. CROSSED SARGO 2 MI LATE. CLRNC WAS TO CROSS SARGO AT 11000 FT, WE CROSSED AT 12000 FT. ADDITIONALLY, THE FMS LED THE AUTOPLT 2 MI S OF COURSE (APCHING SARGO) BEFORE THE CREW RETURNED TO THE PROPER COURSE. NO ATC QUERIES WERE RECEIVED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT WAS A CANADAIR CL65 AND THE DME PERFORMED NORMALLY AFTER THE 20 MI TO 10 MI JUMP AND NO WRITE-UP WAS NECESSARY. THE RPTR SUSPECTS THE ANOMALY IN THE DME WAS CAUSED BY PAX PERSONAL ELECTRONIC UNITS.
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.