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Less than standard separation between air carrier X and aircraft Y. System error. Flight crew descended through assigned altitude. Pilot deviation.
| Attributes | |
| ACN | 125589 |
| Time | |
| Date | 198910 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : mem |
| State Reference | TN |
| Altitude | msl bound lower : 10600 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zme |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| 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 | cruise other |
| 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 : 17790 flight time type : 12580 |
| ASRS Report | 125589 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 143 flight time total : 10211 flight time type : 6593 |
| ASRS Report | 125600 |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe non adherence : clearance non adherence : required legal separation non adherence : published procedure |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 3000 vertical : 600 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Operational Error Pilot Deviation |
Narrative:
Air carrier X on descent into mem on middy 7 arrival with vectors we acknowledged a clearance descend to 19,000, pilot discretion to cross middy at 10,000. 10,000 was set in altitude alerters and both pilots verified 10,000. At approximately 37 DME mem at 10,600 ZME (135.37) asked if we were level at 11,000. We replied we were at 10,600 for 10,000. He responded you were cleared to 11,000, turn right and climb to 11,000, you have (aircraft Y was light twin) at position and 10,000. We responded we had traffic in sight and were climbing to 11,000 in right turn. Light twin passed to our rear and below. Communication problem. Need for all of us to listen, but believe ATC controllers are too busy to really listen to readbacks.
Original NASA ASRS Text
Title: LESS THAN STANDARD SEPARATION BETWEEN ACR X AND ACFT Y. SYSTEM ERROR. FLT CREW DESCENDED THROUGH ASSIGNED ALT. PLT DEVIATION.
Narrative: ACR X ON DSCNT INTO MEM ON MIDDY 7 ARR WITH VECTORS WE ACKNOWLEDGED A CLRNC DSND TO 19,000, PLT DISCRETION TO CROSS MIDDY AT 10,000. 10,000 WAS SET IN ALT ALERTERS AND BOTH PLTS VERIFIED 10,000. AT APPROX 37 DME MEM AT 10,600 ZME (135.37) ASKED IF WE WERE LEVEL AT 11,000. WE REPLIED WE WERE AT 10,600 FOR 10,000. HE RESPONDED YOU WERE CLRED TO 11,000, TURN RIGHT AND CLIMB TO 11,000, YOU HAVE (ACFT Y WAS LIGHT TWIN) AT POSITION AND 10,000. WE RESPONDED WE HAD TFC IN SIGHT AND WERE CLIMBING TO 11,000 IN RIGHT TURN. LIGHT TWIN PASSED TO OUR REAR AND BELOW. COM PROBLEM. NEED FOR ALL OF US TO LISTEN, BUT BELIEVE ATC CTLRS ARE TOO BUSY TO REALLY LISTEN TO READBACKS.
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.