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Similar numbers cpr Y took cpr X clearance descent through occupied altitude had less than standard separation from X. System error.
| Attributes | |
| ACN | 286545 |
| Time | |
| Date | 199410 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : rdu |
| State Reference | NC |
| Altitude | msl bound lower : 22000 msl bound upper : 22000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc |
| Operator | general aviation : corporate |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : corporate |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 9 |
| ASRS Report | 286545 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 19500 vertical : 800 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation Operational Error |
Narrative:
Cpr X was on frequency level at FL220. Cpr Y checked on frequency at FL240 and given clearance to FL230. Cpr Y was then advised of the similar call signs. Both aircraft were landing at clt and needed to cross the ZDC/ZTL boundary at 16000 ft. Cpr X was given a turn for spacing. He was later cleared to descend to 16000 ft. Y took the clearance for descent. I noticed Y altitude readout at 21600 and questioned pilot about his clearance. He stated he'd took the clearance and read back for it.
Original NASA ASRS Text
Title: SIMILAR NUMBERS CPR Y TOOK CPR X CLRNC DSCNT THROUGH OCCUPIED ALT HAD LTSS FROM X. SYS ERROR.
Narrative: CPR X WAS ON FREQ LEVEL AT FL220. CPR Y CHKED ON FREQ AT FL240 AND GIVEN CLRNC TO FL230. CPR Y WAS THEN ADVISED OF THE SIMILAR CALL SIGNS. BOTH ACFT WERE LNDG AT CLT AND NEEDED TO CROSS THE ZDC/ZTL BOUNDARY AT 16000 FT. CPR X WAS GIVEN A TURN FOR SPACING. HE WAS LATER CLRED TO DSND TO 16000 FT. Y TOOK THE CLRNC FOR DSCNT. I NOTICED Y ALT READOUT AT 21600 AND QUESTIONED PLT ABOUT HIS CLRNC. HE STATED HE'D TOOK THE CLRNC AND READ BACK FOR IT.
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.