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Potential conflict set up when air carrier flight crew thought controller had given descent to 5000'. Actual altitude assignment was 7000, but flight crew read back 5000. Operational deviation.
| Attributes | |
| ACN | 99620 |
| Time | |
| Date | 198812 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : sat |
| State Reference | TX |
| Altitude | msl bound lower : 5000 msl bound upper : 7000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : sat |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : corporate |
| Make Model Name | Small Transport, Low Wing, 2 Recip Eng |
| 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 : 147 flight time total : 10000 flight time type : 295 |
| ASRS Report | 99620 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe other anomaly other |
| Independent Detector | other other : unspecified atc |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Deviation |
Narrative:
On descent into sat being controled by approach at 5100' we were asked our altitude. We responded by '5100' leveling at 5000'.' controller said we were cleared only to 7000'. We understood and read back 5000'. We were not corrected by the controller. We were not directed to climb back to 7000'. Traffic was small transport Y in the vicinity landing sat also. Talking to supervisor of the controller when on the ground, he verified and I heard the replay of tape. Controller did clear us only to 7000' and we did read back 5000'. Many times the controllers do not appear to listen to our readbacks to verify their instructions.
Original NASA ASRS Text
Title: POTENTIAL CONFLICT SET UP WHEN ACR FLT CREW THOUGHT CTLR HAD GIVEN DESCENT TO 5000'. ACTUAL ALT ASSIGNMENT WAS 7000, BUT FLT CREW READ BACK 5000. OPERATIONAL DEVIATION.
Narrative: ON DSCNT INTO SAT BEING CTLED BY APCH AT 5100' WE WERE ASKED OUR ALT. WE RESPONDED BY '5100' LEVELING AT 5000'.' CTLR SAID WE WERE CLRED ONLY TO 7000'. WE UNDERSTOOD AND READ BACK 5000'. WE WERE NOT CORRECTED BY THE CTLR. WE WERE NOT DIRECTED TO CLB BACK TO 7000'. TFC WAS SMT Y IN THE VICINITY LNDG SAT ALSO. TALKING TO SUPVR OF THE CTLR WHEN ON THE GND, HE VERIFIED AND I HEARD THE REPLAY OF TAPE. CTLR DID CLR US ONLY TO 7000' AND WE DID READ BACK 5000'. MANY TIMES THE CTLRS DO NOT APPEAR TO LISTEN TO OUR READBACKS TO VERIFY THEIR INSTRUCTIONS.
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.