 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
A ZID controller at the previous sector missed a pilot readback error resulting in a loss of separation in the next sector.
| Attributes | |
| ACN | 476501 |
| Time | |
| Date | 200006 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : iiu.vortac |
| State Reference | KY |
| Altitude | msl single value : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | general aviation : personal |
| Make Model Name | Learjet 60 |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other vortac |
| Flight Phase | descent : vacating altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : lex.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | EMB ERJ 145 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 8 |
| ASRS Report | 476501 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : handoff position |
| Qualification | controller : radar |
| Experience | controller military : 4 controller radar : 16 controller time certified in position1 : 7 |
| ASRS Report | 477253 |
| Events | |
| Anomaly | conflict : airborne critical |
| Independent Detector | atc equipment : conflict alert aircraft equipment : tcas other controllera other controllerb other flight crewa other flight crewb other other : 3 |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action none taken : insufficient time |
| Miss Distance | horizontal : 0 vertical : 200 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I accepted the handoff on aircraft X descending to 14000 ft. Air carrier Y was handed off to lex approach at 11000 ft. When conflict alert activated, I broadcasted for aircraft X to see if he was on frequency since he had not checked in. Aircraft X acknowledged and I asked him to say altitude. He stated he was out of 12000 ft for 11000 ft. I cleared aircraft X to climb and maintain 13000 ft in an attempt to maintain separation. Separation was lost. The controller who originally cleared aircraft Y to descend and maintain 14000 ft had missed a readback error. Aircraft X acknowledged a clearance to 11000 ft. I am not certain but I believe the possible underlying cause of this error to be mental fatigue. Supplemental information from acn 477253: aircraft X was issued descent to 14000 ft. Aircraft X read back 11000 ft. I failed to catch readback error.
Original NASA ASRS Text
Title: A ZID CTLR AT THE PREVIOUS SECTOR MISSED A PLT READBACK ERROR RESULTING IN A LOSS OF SEPARATION IN THE NEXT SECTOR.
Narrative: I ACCEPTED THE HDOF ON ACFT X DSNDING TO 14000 FT. ACR Y WAS HANDED OFF TO LEX APCH AT 11000 FT. WHEN CONFLICT ALERT ACTIVATED, I BROADCASTED FOR ACFT X TO SEE IF HE WAS ON FREQ SINCE HE HAD NOT CHKED IN. ACFT X ACKNOWLEDGED AND I ASKED HIM TO SAY ALT. HE STATED HE WAS OUT OF 12000 FT FOR 11000 FT. I CLRED ACFT X TO CLB AND MAINTAIN 13000 FT IN AN ATTEMPT TO MAINTAIN SEPARATION. SEPARATION WAS LOST. THE CTLR WHO ORIGINALLY CLRED ACFT Y TO DSND AND MAINTAIN 14000 FT HAD MISSED A READBACK ERROR. ACFT X ACKNOWLEDGED A CLRNC TO 11000 FT. I AM NOT CERTAIN BUT I BELIEVE THE POSSIBLE UNDERLYING CAUSE OF THIS ERROR TO BE MENTAL FATIGUE. SUPPLEMENTAL INFO FROM ACN 477253: ACFT X WAS ISSUED DSCNT TO 14000 FT. ACFT X READ BACK 11000 FT. I FAILED TO CATCH READBACK ERROR.
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.