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Cpr jet given a descent that they knew would take them through occupied altitude. Traffic was detected on their tcasi ahead and they never questioned the altitude assignment until controller asked what altitude they were going to.
| Attributes | |
| ACN | 363579 |
| Time | |
| Date | 199703 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : abe |
| State Reference | PA |
| Altitude | msl bound lower : 20000 msl bound upper : 22000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny |
| Operator | general aviation : corporate |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 90 flight time total : 9000 flight time type : 90 |
| ASRS Report | 363579 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 75 flight time total : 9300 flight time type : 1100 |
| ASRS Report | 363580 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation non adherence : far other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Miss Distance | horizontal : 24000 vertical : 0 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Operational Error Pilot Deviation |
Narrative:
Traffic was issued to our aircraft while we were descending to FL220. Traffic was at 1 O'clock and FL210. While passing through FL230 the controller said 'traffic 1 O'clock (so many mi) FL210. Maintain FL204.' I responded 'roger descend and maintain FL200.' I assumed we had lateral separation. After passing through FL220 I picked up the traffic visually and then began to notice it to start to rise above the horizon, realizing we were going through his altitude. At FL210 the controller asked us to verify we were descending to FL220 and I responded 'negative we were given FL200.' at about that time our tcasi sounded 'traffic, traffic.' no evasive action was needed as we were well separated visually. Supplemental information from acn 363580: passing through about FL210, the controller asked us to confirm our descent to FL220. Copilot replied -- 'negative, we were cleared to FL200.' controller advised us of traffic which we had in sight and had been watching for several mi. No further comments were made. Obviously the controller did not intend to clear us to FL200, but both myself and the copilot clearly heard her say descend to FL200. I would normally have caught the controller's mistake except I was preoccupied with loading an approach in the navigation management system and wasn't watching the tcasi (tcasi system).
Original NASA ASRS Text
Title: CPR JET GIVEN A DSCNT THAT THEY KNEW WOULD TAKE THEM THROUGH OCCUPIED ALT. TFC WAS DETECTED ON THEIR TCASI AHEAD AND THEY NEVER QUESTIONED THE ALT ASSIGNMENT UNTIL CTLR ASKED WHAT ALT THEY WERE GOING TO.
Narrative: TFC WAS ISSUED TO OUR ACFT WHILE WE WERE DSNDING TO FL220. TFC WAS AT 1 O'CLOCK AND FL210. WHILE PASSING THROUGH FL230 THE CTLR SAID 'TFC 1 O'CLOCK (SO MANY MI) FL210. MAINTAIN FL204.' I RESPONDED 'ROGER DSND AND MAINTAIN FL200.' I ASSUMED WE HAD LATERAL SEPARATION. AFTER PASSING THROUGH FL220 I PICKED UP THE TFC VISUALLY AND THEN BEGAN TO NOTICE IT TO START TO RISE ABOVE THE HORIZON, REALIZING WE WERE GOING THROUGH HIS ALT. AT FL210 THE CTLR ASKED US TO VERIFY WE WERE DSNDING TO FL220 AND I RESPONDED 'NEGATIVE WE WERE GIVEN FL200.' AT ABOUT THAT TIME OUR TCASI SOUNDED 'TFC, TFC.' NO EVASIVE ACTION WAS NEEDED AS WE WERE WELL SEPARATED VISUALLY. SUPPLEMENTAL INFO FROM ACN 363580: PASSING THROUGH ABOUT FL210, THE CTLR ASKED US TO CONFIRM OUR DSCNT TO FL220. COPLT REPLIED -- 'NEGATIVE, WE WERE CLRED TO FL200.' CTLR ADVISED US OF TFC WHICH WE HAD IN SIGHT AND HAD BEEN WATCHING FOR SEVERAL MI. NO FURTHER COMMENTS WERE MADE. OBVIOUSLY THE CTLR DID NOT INTEND TO CLR US TO FL200, BUT BOTH MYSELF AND THE COPLT CLRLY HEARD HER SAY DSND TO FL200. I WOULD NORMALLY HAVE CAUGHT THE CTLR'S MISTAKE EXCEPT I WAS PREOCCUPIED WITH LOADING AN APCH IN THE NAV MGMNT SYS AND WASN'T WATCHING THE TCASI (TCASI SYS).
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.