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Air carrier Y flew through the parallel ILS final approach course and had less than standard separation from air carrier X. Pilot deviation.
| Attributes | |
| ACN | 144995 |
| Time | |
| Date | 199005 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : ord |
| State Reference | IL |
| Altitude | msl bound lower : 3000 msl bound upper : 4000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : ord |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent : approach |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 80 flight time total : 11000 flight time type : 80 |
| ASRS Report | 144999 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 130 |
| ASRS Report | 145424 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : clearance non adherence : required legal separation other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 6000 vertical : 0 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Parallel approachs being conducted to runway 27L & right at ord in heavy rain (moderate turbulence reported by an air carrier flight ahead of us on downwind for 27R). Air carrier X ordered by ord approach monitor to 'descend immediately to 3000',' followed shortly thereafter by the statement, 'you are now clear of conflicting traffic.' observed air carrier Y medium large transport in and out of clouds correcting back to runway 27L localizer (appeared to have overshot localizer on runway 27L) approximately at our altitude, closer than normal sep for parallel ILS approachs. Supplemental information from acn 145424: air carrier aircraft reported moderate turbulence and a loss of 300' on downwind leg for 27R. Controller said, 'I know you've got moderate turbulence, but you have to answer my calls. Air carrier vectored to intercept 27R. Air carrier X on course approaching ebens when ordered to descend to 3000' as flew through 27L ILS course. Complied. Broke out and sighted air carrier Y medium large transport at about 1/2 normal spacing. Air carrier Y was gong away from our position. Air carrier X continued to a normal landing via 27R ILS. I question simultaneous approachs with moderate turbulence in the approach area. I think a normal turn on in strong wind conditions could have caused air carrier Y to overshoot the ILS course. Air carrier X experienced a rough ride heavy rain, but less than moderate turbulence.
Original NASA ASRS Text
Title: ACR Y FLEW THROUGH THE PARALLEL ILS FINAL APCH COURSE AND HAD LESS THAN STANDARD SEPARATION FROM ACR X. PLT DEVIATION.
Narrative: PARALLEL APCHS BEING CONDUCTED TO RWY 27L & R AT ORD IN HEAVY RAIN (MODERATE TURB RPTED BY AN ACR FLT AHEAD OF US ON DOWNWIND FOR 27R). ACR X ORDERED BY ORD APCH MONITOR TO 'DSND IMMEDIATELY TO 3000',' FOLLOWED SHORTLY THEREAFTER BY THE STATEMENT, 'YOU ARE NOW CLR OF CONFLICTING TFC.' OBSERVED ACR Y MLG IN AND OUT OF CLOUDS CORRECTING BACK TO RWY 27L LOC (APPEARED TO HAVE OVERSHOT LOC ON RWY 27L) APPROX AT OUR ALT, CLOSER THAN NORMAL SEP FOR PARALLEL ILS APCHS. SUPPLEMENTAL INFO FROM ACN 145424: ACR ACFT RPTED MODERATE TURB AND A LOSS OF 300' ON DOWNWIND LEG FOR 27R. CTLR SAID, 'I KNOW YOU'VE GOT MODERATE TURB, BUT YOU HAVE TO ANSWER MY CALLS. ACR VECTORED TO INTERCEPT 27R. ACR X ON COURSE APCHING EBENS WHEN ORDERED TO DSND TO 3000' AS FLEW THROUGH 27L ILS COURSE. COMPLIED. BROKE OUT AND SIGHTED ACR Y MLG AT ABOUT 1/2 NORMAL SPACING. ACR Y WAS GONG AWAY FROM OUR POS. ACR X CONTINUED TO A NORMAL LNDG VIA 27R ILS. I QUESTION SIMULTANEOUS APCHS WITH MODERATE TURB IN THE APCH AREA. I THINK A NORMAL TURN ON IN STRONG WIND CONDITIONS COULD HAVE CAUSED ACR Y TO OVERSHOOT THE ILS COURSE. ACR X EXPERIENCED A ROUGH RIDE HEAVY RAIN, BUT LESS THAN MODERATE TURB.
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.