Air carrier X TCASII TA had near midair collision with Y. Evasive action taken. Air carrier X flew t...

Attributes
ACN	207402
Time
Date	199204
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : cmh
State Reference	OH
Altitude	msl bound lower : 4000 msl bound upper : 4300
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : cmh tower : roa
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Experience	flight time last 90 days : 180 flight time total : 2000 flight time type : 400
ASRS Report	207402
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 12000 flight time type : 4000
ASRS Report	207251
Events
Anomaly	conflict : nmac non adherence : clearance other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 500 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

We were on a 180 degree heading for a base leg to the ILS 10R at cmh and cleared to 4000 ft MSL. A scattered to broken layer of clouds was between 4000 ft to 5000 ft MSL. As we went into the clouds, we received a 'traffic, traffic' warning from the TCASII. The yellow target did not show any altitude or descending ascending arrow. The traffic was shown being 5 mi on our nose. Shortly after the TCASII alert. Cmh approach called out the traffic but also did not have any altitude information. As we broke out of the clouds (approximately 4300 ft MSL) I saw the aircraft on our nose and because we were descending we were on a collision course. I directed the captain to pull up to avoid the other aircraft. The other aircraft was operating VFR and not in contact with ATC, however, it appeared the aircraft was very close to our level off altitude of 4000 ft MSL. During this period, approach gave us a vector to intercept the localizer to 10R. We missed this call due to our preoccupation with avoiding the other aircraft. As we were flying through the centerline of the localizer (on our 180 degree vector) we realized something wasn't right but were unable to query approach due to other radio transmissions. We eventually were vectored back to the localizer and landed uneventfully. Supplemental information from acn 207551: while being radar vectored to the cmh airport, our clearance was to fly 180 degree heading and descend to 4000 ft. While descending we flew through a cloud deck. Shortly after breaking out of the clouds, while still descending, our TCASII system gave us a TA. I then reset our TCASII system to readout on the most sensitive, 5 mi range. A yellow DOT (no altitude readout) appeared at 12 O'clock and about 3 mi. Both captain and first officer looked out the window for traffic. I began my level off at 4000 ft when the first officer abruptly yelled, 'pull up.' I immediately looked out the windshield, pulled up and banked right, narrowly missing the traffic.

Original NASA ASRS Text

Title: ACR X TCASII TA HAD NMAC WITH Y. EVASIVE ACTION TAKEN. ACR X FLEW THROUGH THE LOC NON ADHERENCE TO ATC INSTRUCTIONS. PLTDEV.

Narrative: WE WERE ON A 180 DEG HDG FOR A BASE LEG TO THE ILS 10R AT CMH AND CLRED TO 4000 FT MSL. A SCATTERED TO BROKEN LAYER OF CLOUDS WAS BTWN 4000 FT TO 5000 FT MSL. AS WE WENT INTO THE CLOUDS, WE RECEIVED A 'TFC, TFC' WARNING FROM THE TCASII. THE YELLOW TARGET DID NOT SHOW ANY ALT OR DSNDING ASCENDING ARROW. THE TFC WAS SHOWN BEING 5 MI ON OUR NOSE. SHORTLY AFTER THE TCASII ALERT. CMH APCH CALLED OUT THE TFC BUT ALSO DID NOT HAVE ANY ALT INFO. AS WE BROKE OUT OF THE CLOUDS (APPROX 4300 FT MSL) I SAW THE ACFT ON OUR NOSE AND BECAUSE WE WERE DSNDING WE WERE ON A COLLISION COURSE. I DIRECTED THE CAPT TO PULL UP TO AVOID THE OTHER ACFT. THE OTHER ACFT WAS OPERATING VFR AND NOT IN CONTACT WITH ATC, HOWEVER, IT APPEARED THE ACFT WAS VERY CLOSE TO OUR LEVEL OFF ALT OF 4000 FT MSL. DURING THIS PERIOD, APCH GAVE US A VECTOR TO INTERCEPT THE LOC TO 10R. WE MISSED THIS CALL DUE TO OUR PREOCCUPATION WITH AVOIDING THE OTHER ACFT. AS WE WERE FLYING THROUGH THE CTRLINE OF THE LOC (ON OUR 180 DEG VECTOR) WE REALIZED SOMETHING WASN'T RIGHT BUT WERE UNABLE TO QUERY APCH DUE TO OTHER RADIO TRANSMISSIONS. WE EVENTUALLY WERE VECTORED BACK TO THE LOC AND LANDED UNEVENTFULLY. SUPPLEMENTAL INFO FROM ACN 207551: WHILE BEING RADAR VECTORED TO THE CMH ARPT, OUR CLRNC WAS TO FLY 180 DEG HDG AND DSND TO 4000 FT. WHILE DSNDING WE FLEW THROUGH A CLOUD DECK. SHORTLY AFTER BREAKING OUT OF THE CLOUDS, WHILE STILL DSNDING, OUR TCASII SYS GAVE US A TA. I THEN RESET OUR TCASII SYS TO READOUT ON THE MOST SENSITIVE, 5 MI RANGE. A YELLOW DOT (NO ALT READOUT) APPEARED AT 12 O'CLOCK AND ABOUT 3 MI. BOTH CAPT AND FO LOOKED OUT THE WINDOW FOR TFC. I BEGAN MY LEVEL OFF AT 4000 FT WHEN THE FO ABRUPTLY YELLED, 'PULL UP.' I IMMEDIATELY LOOKED OUT THE WINDSHIELD, PULLED UP AND BANKED R, NARROWLY MISSING THE TFC.

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.

Air carrier X TCASII TA had near midair collision with Y. Evasive action taken. Air carrier X flew through the localizer non adherence to ATC instructions. Pilot deviation.