 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
An small transport came in close proximity to a previously departed mlt due to erroneous altitude readout information.
| Attributes | |
| ACN | 116048 |
| Time | |
| Date | 198907 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : mgm |
| State Reference | AL |
| Altitude | msl bound lower : 3800 msl bound upper : 4000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : mgm |
| Operator | other |
| Make Model Name | Helicopter |
| Flight Phase | cruise other |
| Route In Use | departure other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : corporate |
| Make Model Name | Small Transport, Low Wing, 2 Recip Eng |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : departure |
| Qualification | controller : radar |
| ASRS Report | 116048 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : departure |
| Qualification | controller : developmental |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | Other |
| Miss Distance | horizontal : 12000 vertical : 200 |
| Supplementary | |
| Air Traffic Incident | Operational Error |
| Situations | |
| ATC Facility | other physical facility |
Narrative:
I was working south departure radar with a developmental in position. An mlt copter departed mgm and was vectored and climbed to 4000'. An small transport departed behind the copter and was vectored to parallel the copter by 3 mi and told to expect 'on course' leaving 5000'. When the small transport altitude readout was 5600' he was told by the developmental to 'turn right on course'. The altitude readout on the small transport then read 3800'. After verifying the altitude, the developmental took corrective action. Separation decreased to 2 mi. This erroneous mode C problem is a recurring one. The controller workforce has documented discrepancies and brought it to the attention of management. This occurrence was reported to first level supervision.
Original NASA ASRS Text
Title: AN SMT CAME IN CLOSE PROX TO A PREVIOUSLY DEPARTED MLT DUE TO ERRONEOUS ALT READOUT INFORMATION.
Narrative: I WAS WORKING S DEP RADAR WITH A DEVELOPMENTAL IN POSITION. AN MLT COPTER DEPARTED MGM AND WAS VECTORED AND CLIMBED TO 4000'. AN SMT DEPARTED BEHIND THE COPTER AND WAS VECTORED TO PARALLEL THE COPTER BY 3 MI AND TOLD TO EXPECT 'ON COURSE' LEAVING 5000'. WHEN THE SMT ALT READOUT WAS 5600' HE WAS TOLD BY THE DEVELOPMENTAL TO 'TURN RIGHT ON COURSE'. THE ALT READOUT ON THE SMT THEN READ 3800'. AFTER VERIFYING THE ALT, THE DEVELOPMENTAL TOOK CORRECTIVE ACTION. SEPARATION DECREASED TO 2 MI. THIS ERRONEOUS MODE C PROBLEM IS A RECURRING ONE. THE CTLR WORKFORCE HAS DOCUMENTED DISCREPANCIES AND BROUGHT IT TO THE ATTN OF MGMNT. THIS OCCURRENCE WAS REPORTED TO FIRST LEVEL SUPERVISION.
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.