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Air carrier X descent through occupied altitude clearance issued in error had less than standard separation from Y. System error.
| Attributes | |
| ACN | 227360 |
| Time | |
| Date | 199211 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : sea |
| State Reference | WA |
| Altitude | msl bound lower : 9000 msl bound upper : 9600 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : sea |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 11000 flight time type : 150 |
| ASRS Report | 227360 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : investigated faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 12000 vertical : 600 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X cleared to 7000 on descent. We used the company finger pointing method for all altitude clrncs. While descending through 9600 ft traffic Y was called at 12 O'clock, opposite direction climbing to 9000. We climbed back to 10000. Telephone call to approach control indicated we were cleared to 7000, acknowledged 7000. Clearance issued in error. Dispatched that day with TCASII inoperative per MEL; wish we had it that day!
Original NASA ASRS Text
Title: ACR X DSCNT THROUGH OCCUPIED ALT CLRNC ISSUED IN ERROR HAD LTSS FROM Y. SYS ERROR.
Narrative: ACR X CLRED TO 7000 ON DSCNT. WE USED THE COMPANY FINGER POINTING METHOD FOR ALL ALT CLRNCS. WHILE DSNDING THROUGH 9600 FT TFC Y WAS CALLED AT 12 O'CLOCK, OPPOSITE DIRECTION CLBING TO 9000. WE CLBED BACK TO 10000. TELEPHONE CALL TO APCH CTL INDICATED WE WERE CLRED TO 7000, ACKNOWLEDGED 7000. CLRNC ISSUED IN ERROR. DISPATCHED THAT DAY WITH TCASII INOP PER MEL; WISH WE HAD IT THAT DAY!
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.