F100 aircraft on approach to runway 4R, ord, ILS on course at 4000 ft localizer deflection 1 DOT to either side of center. Eventually settled down to good signal.

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Attributes
ACN	394469
Time
Date	199802
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	msl bound lower : 4000 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ord
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	394469
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	none taken : unable
Consequence	Other
Supplementary
Primary Problem	Airport
Air Traffic Incident	other
Situations
Airport	other physical facility

Narrative:

Location: ILS runway 4R ord. WX reported 360 degrees, 11 KTS, 6-RA broken 8 overcast, altimeter 29.61. On ILS runway 4R, 1.2 mi outside naper at 4000 ft, experienced 1 DOT localizer deflection either side center. Inside rekks, localizer deflected 1/2 DOT each side centerline, but we had visual with runway. Followed heavy jet 5 mi ahead. Callback conversation with reporter revealed the following information: reporter captain didn't know what caused the deflection but surmised it was caused by the heavy jet 5 mi in front on the same ILS. Reporter didn't question the tower or carry it any further than a company report. She said she has heard from other pilots that it is a recurring event at ord.

Original NASA ASRS Text

Title: F100 ACFT ON APCH TO RWY 4R, ORD, ILS ON COURSE AT 4000 FT LOC DEFLECTION 1 DOT TO EITHER SIDE OF CTR. EVENTUALLY SETTLED DOWN TO GOOD SIGNAL.

Narrative: LOCATION: ILS RWY 4R ORD. WX RPTED 360 DEGS, 11 KTS, 6-RA BROKEN 8 OVCST, ALTIMETER 29.61. ON ILS RWY 4R, 1.2 MI OUTSIDE NAPER AT 4000 FT, EXPERIENCED 1 DOT LOC DEFLECTION EITHER SIDE CTR. INSIDE REKKS, LOC DEFLECTED 1/2 DOT EACH SIDE CTRLINE, BUT WE HAD VISUAL WITH RWY. FOLLOWED HVY JET 5 MI AHEAD. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR CAPT DIDN'T KNOW WHAT CAUSED THE DEFLECTION BUT SURMISED IT WAS CAUSED BY THE HVY JET 5 MI IN FRONT ON THE SAME ILS. RPTR DIDN'T QUESTION THE TWR OR CARRY IT ANY FURTHER THAN A COMPANY RPT. SHE SAID SHE HAS HEARD FROM OTHER PLTS THAT IT IS A RECURRING EVENT AT ORD.

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.