 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Aircraft X was given a clearance to 11000 ft and read back 10000 ft. Radar controller did not correct readback. Aircraft X descended below 11000 ft and separation was lost with aircraft Y at 10000 ft.
| Attributes | |
| ACN | 446415 |
| Time | |
| Date | 199908 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : flm.vor |
| State Reference | KY |
| Altitude | msl single value : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Beechjet 400 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller military : 6 controller radar : 12 controller time certified in position1 : 5 |
| ASRS Report | 446415 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : supervisor |
| Qualification | controller : radar |
| Experience | controller radar : 16 controller supervisory : 14 |
| ASRS Report | 446645 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : required legal separation other anomaly other |
| Independent Detector | atc equipment : conflict alert atc equipment other atc equipment : error detection printer other controllera other controllerb |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 20820 vertical : 300 |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Operational Error Pilot Deviation |
Narrative:
B727 was issued 11000 ft. He acknowledged 11000 ft. Later B727 was issued speed to maintain 250 KTS. He read that back and added 10000 ft. I heard the speed read back. He went below 11000 ft and conflict alert activated with BE40 at 10000 ft. When questioned B727 said he was assigned 10000 ft. Callback conversation with reporter revealed the following information: reporter stated that the facility filed this incident as both a operational error and a pilot deviation.
Original NASA ASRS Text
Title: ACFT X WAS GIVEN A CLRNC TO 11000 FT AND READ BACK 10000 FT. RADAR CTLR DID NOT CORRECT READBACK. ACFT X DSNDED BELOW 11000 FT AND SEPARATION WAS LOST WITH ACFT Y AT 10000 FT.
Narrative: B727 WAS ISSUED 11000 FT. HE ACKNOWLEDGED 11000 FT. LATER B727 WAS ISSUED SPD TO MAINTAIN 250 KTS. HE READ THAT BACK AND ADDED 10000 FT. I HEARD THE SPD READ BACK. HE WENT BELOW 11000 FT AND CONFLICT ALERT ACTIVATED WITH BE40 AT 10000 FT. WHEN QUESTIONED B727 SAID HE WAS ASSIGNED 10000 FT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT THE FACILITY FILED THIS INCIDENT AS BOTH A OPERROR AND A PLTDEV.
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.