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ZID controller witnessed operational error at FL320 when receiving controller failed to note incorrect readback from pilot.
| Attributes | |
| ACN | 781792 |
| Time | |
| Date | 200804 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | navaid : hyk.vortac |
| State Reference | KY |
| Altitude | msl single value : 22000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Regional Jet 200 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | EMB ERJ 145 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure sid : n/s |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 17 controller time certified in position1 : 17 |
| ASRS Report | 781792 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne critical non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued alert controller : issued new clearance flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 7550 vertical : 500 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft #1 issued descent to FL330. Pilot read back FL330. Aircraft #1 switched to next frequency. Aircraft #1 calls on 'leaving FL339 for FL320.' controller heard other controller issue FL330 and FL330 in data block erred by not catching FL320 on check-on. Aircraft #1 was sebound; aircraft #2 swbound level at FL320. Traffic was called to both aircraft. When aircraft #1 data block read FL329 controller told aircraft #1 to maintain 'FL330' and told aircraft #2 to expedite descent to FL240. Aircraft #1 stopped descent at FL325 and back to FL330 within 15 seconds. Aircraft #1 said they got an RA but did not say what it was. Both aircraft reported other in sight upon traffic call.
Original NASA ASRS Text
Title: ZID CTLR WITNESSED OPERROR AT FL320 WHEN RECEIVING CTLR FAILED TO NOTE INCORRECT READBACK FROM PLT.
Narrative: ACFT #1 ISSUED DSCNT TO FL330. PLT READ BACK FL330. ACFT #1 SWITCHED TO NEXT FREQ. ACFT #1 CALLS ON 'LEAVING FL339 FOR FL320.' CTLR HEARD OTHER CTLR ISSUE FL330 AND FL330 IN DATA BLOCK ERRED BY NOT CATCHING FL320 ON CHK-ON. ACFT #1 WAS SEBOUND; ACFT #2 SWBOUND LEVEL AT FL320. TFC WAS CALLED TO BOTH ACFT. WHEN ACFT #1 DATA BLOCK READ FL329 CTLR TOLD ACFT #1 TO MAINTAIN 'FL330' AND TOLD ACFT #2 TO EXPEDITE DSCNT TO FL240. ACFT #1 STOPPED DSCNT AT FL325 AND BACK TO FL330 WITHIN 15 SECONDS. ACFT #1 SAID THEY GOT AN RA BUT DID NOT SAY WHAT IT WAS. BOTH ACFT RPTED OTHER IN SIGHT UPON TFC CALL.
Data retrieved from NASA's ASRS site as of May 2009 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.