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Less than standard separation between C172 and C310 when one of the pilots miscopied and read back the wrong altitude. Reporter restated wrong altitude back to pilot.
| Attributes | |
| ACN | 335606 |
| Time | |
| Date | 199605 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : abr |
| State Reference | SD |
| Environment | |
| Flight Conditions | IMC |
| Light | Dawn |
| Aircraft 1 | |
| Controlling Facilities | artcc : zmp |
| Operator | general aviation : personal |
| Make Model Name | Skyhawk 172/Cutlass 172 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Cessna 310/T310C |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : approach descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 5 |
| ASRS Report | 335606 |
| Person 2 | |
| Affiliation | government : faa |
| Function | oversight : supervisor |
| Qualification | controller : radar |
| Events | |
| Anomaly | non adherence : published procedure non adherence : required legal separation other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Pilot Deviation Operational Error |
Narrative:
WX was poor. Frequency congestion was very bad. (This sector has 6 paired frequencys.) the aircraft was informed what to expect for his planning purposes and concurrence. He stated it back as a clearance. I did not recognize the bad altitude in the readback and restated it to him, confirming the wrong altitude. I had just asked for a d-side due to complexity, not volume. The supervisor arrived to look at things as the separation was lost. Supervisor, not controllers (who are preoccupied by their situation) should be responsible for monitoring better. Pilots need to be more responsible for the information they restate when they are uncertain, rather than just guessing.
Original NASA ASRS Text
Title: LTSS BTWN C172 AND C310 WHEN ONE OF THE PLTS MISCOPIED AND READ BACK THE WRONG ALT. RPTR RESTATED WRONG ALT BACK TO PLT.
Narrative: WX WAS POOR. FREQ CONGESTION WAS VERY BAD. (THIS SECTOR HAS 6 PAIRED FREQS.) THE ACFT WAS INFORMED WHAT TO EXPECT FOR HIS PLANNING PURPOSES AND CONCURRENCE. HE STATED IT BACK AS A CLRNC. I DID NOT RECOGNIZE THE BAD ALT IN THE READBACK AND RESTATED IT TO HIM, CONFIRMING THE WRONG ALT. I HAD JUST ASKED FOR A D-SIDE DUE TO COMPLEXITY, NOT VOLUME. THE SUPVR ARRIVED TO LOOK AT THINGS AS THE SEPARATION WAS LOST. SUPVR, NOT CTLRS (WHO ARE PREOCCUPIED BY THEIR SIT) SHOULD BE RESPONSIBLE FOR MONITORING BETTER. PLTS NEED TO BE MORE RESPONSIBLE FOR THE INFO THEY RESTATE WHEN THEY ARE UNCERTAIN, RATHER THAN JUST GUESSING.
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.