While established on the localizer conducting an ILS approach reporter aircraft had a near midair collision with another air carrier act.

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Attributes
ACN	106051
Time
Date	198903
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : iah
State Reference	TX
Altitude	msl bound lower : 2200 msl bound upper : 2200
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : iah
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 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
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 9900 flight time type : 6000
ASRS Report	106051
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : nmac non adherence : required legal separation
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : investigated
Miss Distance	horizontal : 300 vertical : 200
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier a flight xx (medium large transport) on approach to iah, we were vectored and subsequently cleared for the ILS 9 approach. While descending on G/south and tracking ILS localizer inbound (automatic/coupled approach) encountered a near miss with air carrier B. Flight xy (medium large transport) we were just breaking out of a ragged overcast when captain spotted medium large transport at our 2 O'clock position. He took evasive action after disconnecting autoplt. Flight xy passed below and behind. We continued ILS approach and landed no injuries. Callback conversation with reporter revealed following information. The reporter states that he has no idea where the other aircraft was going and had not heard any radio conversation referring to the other aircraft. He states that a formal investigation is underway and includes the FAA and the NTSB although he is unsure what if any conclusions have been reached. His opinion is that the other aircraft was on a vector and either was given erroneous heading information or responded incorrectly to heading information.

Original NASA ASRS Text

Title: WHILE ESTABLISHED ON THE LOCALIZER CONDUCTING AN ILS APCH REPORTER ACFT HAD A NMAC WITH ANOTHER AIR CARRIER ACT.

Narrative: ACR A FLT XX (MLG) ON APCH TO IAH, WE WERE VECTORED AND SUBSEQUENTLY CLRED FOR THE ILS 9 APCH. WHILE DSNDING ON G/S AND TRACKING ILS LOC INBND (AUTO/COUPLED APCH) ENCOUNTERED A NEAR MISS WITH ACR B. FLT XY (MLG) WE WERE JUST BREAKING OUT OF A RAGGED OVERCAST WHEN CAPT SPOTTED MLG AT OUR 2 O'CLOCK POS. HE TOOK EVASIVE ACTION AFTER DISCONNECTING AUTOPLT. FLT XY PASSED BELOW AND BEHIND. WE CONTINUED ILS APCH AND LANDED NO INJURIES. CALLBACK CONVERSATION WITH RPTR REVEALED FOLLOWING INFO. THE RPTR STATES THAT HE HAS NO IDEA WHERE THE OTHER ACFT WAS GOING AND HAD NOT HEARD ANY RADIO CONVERSATION REFERRING TO THE OTHER ACFT. HE STATES THAT A FORMAL INVESTIGATION IS UNDERWAY AND INCLUDES THE FAA AND THE NTSB ALTHOUGH HE IS UNSURE WHAT IF ANY CONCLUSIONS HAVE BEEN REACHED. HIS OPINION IS THAT THE OTHER ACFT WAS ON A VECTOR AND EITHER WAS GIVEN ERRONEOUS HEADING INFO OR RESPONDED INCORRECTLY TO HEADING INFO.

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