MD80 responds to TCAS RA prior to glide slope intercept while on visual approach to runway 22R at or...

Attributes
ACN	736611
Time
Date	200704
Local Time Of Day	0601 To 1200
Place
Locale Reference	intersection : nolen
State Reference	IL
Altitude	msl single value : 3000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tower : ord.tower
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : ord.tower
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	descent : approach
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	736611
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	736612
Events
Anomaly	conflict : nmac
Resolutory Action	flight crew : took evasive action
Miss Distance	horizontal : 0 vertical : 300
Supplementary
Problem Areas	Flight Crew Human Performance Airspace Structure ATC Human Performance
Primary Problem	Airspace Structure

Narrative:

During arrival we were turned towards final and then cleared for the visual approach to runway 22R. Our last assigned altitude was 3000 ft and I leveled off there using the autoplt. We were below the GS; however; my intent was to capture from below and use the ILS and GPS as a backup to an autoplt flown visual approach. A target appeared on the TCAS 300 ft below and touching the airplane symbol. I went from white to yellow to red in about 5 seconds. I clicked off the autoplt; responded to the advisory and started a climb to the vsi-directed 1500 FPM climb. When 'clear of conflict' was announced; I decreased the climb and re-established myself on GS from above.

Original NASA ASRS Text

Title: MD80 RESPONDS TO TCAS RA PRIOR TO GLIDE SLOPE INTERCEPT WHILE ON VISUAL APCH TO RWY 22R AT ORD.

Narrative: DURING ARR WE WERE TURNED TOWARDS FINAL AND THEN CLRED FOR THE VISUAL APCH TO RWY 22R. OUR LAST ASSIGNED ALT WAS 3000 FT AND I LEVELED OFF THERE USING THE AUTOPLT. WE WERE BELOW THE GS; HOWEVER; MY INTENT WAS TO CAPTURE FROM BELOW AND USE THE ILS AND GPS AS A BACKUP TO AN AUTOPLT FLOWN VISUAL APCH. A TARGET APPEARED ON THE TCAS 300 FT BELOW AND TOUCHING THE AIRPLANE SYMBOL. I WENT FROM WHITE TO YELLOW TO RED IN ABOUT 5 SECONDS. I CLICKED OFF THE AUTOPLT; RESPONDED TO THE ADVISORY AND STARTED A CLB TO THE VSI-DIRECTED 1500 FPM CLB. WHEN 'CLR OF CONFLICT' WAS ANNOUNCED; I DECREASED THE CLB AND RE-ESTABLISHED MYSELF ON GS FROM ABOVE.

Data retrieved from NASA's ASRS site as of January 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.

MD80 responds to TCAS RA prior to glide slope intercept while on visual approach to runway 22R at ord.