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Air carrier came in close proximity to another air carrier resulting in less than standard separation.
| Attributes | |
| ACN | 134467 |
| Time | |
| Date | 199001 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : pmm |
| State Reference | MI |
| Altitude | msl bound lower : 29500 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 2 controller radar : 7 |
| ASRS Report | 134467 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | non adherence : clearance other anomaly other other spatial deviation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | Other |
| Miss Distance | horizontal : 15000 vertical : 1800 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Air carrier X on 180 degree vectors for sequencing with ord inbound traffic and air carrier Y at FL310. Air carrier X was cleared from FL310 to descend to FL280. He correctly read back descent clearance. Air carrier X was then turned direct pmm, from approximately 18 NM northeast of pmm. Pilot read back clearance, then a short time later questioned 'still maintaining heading 180?' air carrier X was cleared direct pmm a second time and correctly read clearance back again. Air carrier Y was turned 15 degrees left to pass south of pmm. Air carrier X still not turning. He was assigned a 270 degree heading and told to expedite turn. Air carrier Y was turned further 30 degrees left and told to expedite. Sep was lost approximately 10 southeast of pmm, air carrier X FL295, air carrier Y at FL310. Air carrier X accepted and read back 2 clrncs for direct pmm but did not comply. His rate of descent averaged only 600 FPM (not a normal descent).
Original NASA ASRS Text
Title: ACR CAME IN CLOSE PROX TO ANOTHER ACR RESULTING IN LESS THAN STANDARD SEPARATION.
Narrative: ACR X ON 180 DEG VECTORS FOR SEQUENCING WITH ORD INBND TFC AND ACR Y AT FL310. ACR X WAS CLRED FROM FL310 TO DSND TO FL280. HE CORRECTLY READ BACK DSCNT CLRNC. ACR X WAS THEN TURNED DIRECT PMM, FROM APPROX 18 NM NE OF PMM. PLT READ BACK CLRNC, THEN A SHORT TIME LATER QUESTIONED 'STILL MAINTAINING HDG 180?' ACR X WAS CLRED DIRECT PMM A SECOND TIME AND CORRECTLY READ CLRNC BACK AGAIN. ACR Y WAS TURNED 15 DEGS LEFT TO PASS S OF PMM. ACR X STILL NOT TURNING. HE WAS ASSIGNED A 270 DEG HDG AND TOLD TO EXPEDITE TURN. ACR Y WAS TURNED FURTHER 30 DEGS LEFT AND TOLD TO EXPEDITE. SEP WAS LOST APPROX 10 SE OF PMM, ACR X FL295, ACR Y AT FL310. ACR X ACCEPTED AND READ BACK 2 CLRNCS FOR DIRECT PMM BUT DID NOT COMPLY. HIS RATE OF DSCNT AVERAGED ONLY 600 FPM (NOT A NORMAL DSCNT).
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.