<< >> NASA ASRS Report 203068, February 1992

Air carrier aircraft conducting an ILS approach in IMC conditions has encounter with uncontrolled crossing traffic.

Attributes
ACN	203068
Time
Date	199202
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : iah
State Reference	TX
Altitude	agl bound lower : 2000 agl bound upper : 2000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : iah
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 225 flight time total : 14000 flight time type : 5000
ASRS Report	203068
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe other anomaly other
Independent Detector	other controllera
Resolutory Action	other
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 1500 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While flying the ILS to runway 4 at houston hobby airport, we experienced a near miss with an unidented aircraft. We were in the clouds under IFR conditions, and our TCASII was inoperative. We were 5-6 mi from the airport when the aircraft, flying in a northwest direction crossed our approach path from right to left. The controller advised us of the traffic when he was 1/2 to 1 mi away. ATC had no radio contact with the other aircraft, but mode C readout indicated he was at our altitude of 2000 ft AGL. The controller gave us an immediate right turn to avoid the traffic. ATC said he came within 1/4 mi of our position. When the traffic cleared we continued the ILS. The controller said he would try and track down the other aircraft for identify and possible violation.

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Original NASA ASRS Text

Title: ACR ACFT CONDUCTING AN ILS APCH IN IMC CONDITIONS HAS ENCOUNTER WITH UNCTLED XING TFC.

Narrative: WHILE FLYING THE ILS TO RWY 4 AT HOUSTON HOBBY ARPT, WE EXPERIENCED A NEAR MISS WITH AN UNIDENTED ACFT. WE WERE IN THE CLOUDS UNDER IFR CONDITIONS, AND OUR TCASII WAS INOP. WE WERE 5-6 MI FROM THE ARPT WHEN THE ACFT, FLYING IN A NW DIRECTION CROSSED OUR APCH PATH FROM R TO L. THE CTLR ADVISED US OF THE TFC WHEN HE WAS 1/2 TO 1 MI AWAY. ATC HAD NO RADIO CONTACT WITH THE OTHER ACFT, BUT MODE C READOUT INDICATED HE WAS AT OUR ALT OF 2000 FT AGL. THE CTLR GAVE US AN IMMEDIATE R TURN TO AVOID THE TFC. ATC SAID HE CAME WITHIN 1/4 MI OF OUR POS. WHEN THE TFC CLRED WE CONTINUED THE ILS. THE CTLR SAID HE WOULD TRY AND TRACK DOWN THE OTHER ACFT FOR IDENT AND POSSIBLE VIOLATION.

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.