Heading track deviation creates a potential conflict with other aircraft. IAP ILS approach.

Attributes
ACN	254105
Time
Date	199310
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : lga
State Reference	NY
Altitude	msl bound lower : 5000 msl bound upper : 5500
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : n90
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent : approach 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 : captain oversight : pic
Qualification	pilot : flight engineer pilot : commercial pilot : atp pilot : instrument
Experience	flight time last 90 days : 200 flight time total : 15000 flight time type : 2000
ASRS Report	254105
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 6000 flight time type : 1000
ASRS Report	254103
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : published procedure other anomaly other other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : became reoriented flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Had tuned and idented lga runway 04 ILS. Approach control vectored us on 070 degree heading to intercept ILS localizer and proceed inbound to runway 04 at lga. Localizer CDI did not appear on HSI or ADI -- overshot localizer, got TA on TCASII, turned to 350 degree heading to re-intercept, got clearance to descend to 3000 ft from approach, then got RA on TCASII with steep climb command. We complied. Traffic passed 4 or 5 mi to our right through our altitude. TCASII stated 'conflict resolved' (or whatever the wording is). We reported to lga tower that ILS was apparently not working properly. Then, I realized the approach course we had in ILS receiver was 173 degrees instead of the required 044 degrees. I set ILS course to 044 degrees. ILS indications became normal. Lga tower asked if ILS was operating normally. We replied that it was. Cause of all this was ILS course set incorrectly. I knew it made a difference, but first officer and jumpseat captain both were surprised. All other aircraft we had flown (large transport, medium large transport, widebody transport), the incorrect course would not affect intercept, but large transport/widebody transport (2 engine) definitely does require exactly correct course.

Original NASA ASRS Text

Title: HDG TRACK DEV CREATES A POTENTIAL CONFLICT WITH OTHER ACFT. IAP ILS APCH.

Narrative: HAD TUNED AND IDENTED LGA RWY 04 ILS. APCH CTL VECTORED US ON 070 DEG HDG TO INTERCEPT ILS LOC AND PROCEED INBOUND TO RWY 04 AT LGA. LOC CDI DID NOT APPEAR ON HSI OR ADI -- OVERSHOT LOC, GOT TA ON TCASII, TURNED TO 350 DEG HDG TO RE-INTERCEPT, GOT CLRNC TO DSND TO 3000 FT FROM APCH, THEN GOT RA ON TCASII WITH STEEP CLB COMMAND. WE COMPLIED. TFC PASSED 4 OR 5 MI TO OUR R THROUGH OUR ALT. TCASII STATED 'CONFLICT RESOLVED' (OR WHATEVER THE WORDING IS). WE RPTED TO LGA TWR THAT ILS WAS APPARENTLY NOT WORKING PROPERLY. THEN, I REALIZED THE APCH COURSE WE HAD IN ILS RECEIVER WAS 173 DEGS INSTEAD OF THE REQUIRED 044 DEGS. I SET ILS COURSE TO 044 DEGS. ILS INDICATIONS BECAME NORMAL. LGA TWR ASKED IF ILS WAS OPERATING NORMALLY. WE REPLIED THAT IT WAS. CAUSE OF ALL THIS WAS ILS COURSE SET INCORRECTLY. I KNEW IT MADE A DIFFERENCE, BUT FO AND JUMPSEAT CAPT BOTH WERE SURPRISED. ALL OTHER ACFT WE HAD FLOWN (LGT, MLG, WDB), THE INCORRECT COURSE WOULD NOT AFFECT INTERCEPT, BUT LGT/WDB (2 ENG) DEFINITELY DOES REQUIRE EXACTLY CORRECT COURSE.

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.