Air carrier medium large transport noted localizer fluctuation near localizer intercept for runway 14R at ord. Approach controller vectored aircraft away from localizer for second approach.

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Attributes
ACN	106352
Time
Date	198903
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	msl bound lower : 2400 msl bound upper : 2400
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Controlling Facilities	tracon : ord artcc : zla
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	ils localizer & glide slope : ord
Flight Phase	descent : approach
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 210
ASRS Report	106352
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	non adherence : clearance non adherence : published procedure other spatial deviation
Independent Detector	other controllera other flight crewa
Resolutory Action	controller : issued new clearance other
Consequence	Other
Supplementary
Primary Problem	Navigational Facility
Air Traffic Incident	Pilot Deviation

Narrative:

Flight was given an intercept heading and cleared for ILS approach 14R (ord). At point of intercept captain's and first officer's HSI display of localizer oscillated plus or minus 1 1/2 dots and displayed full offset behind. Only seconds later to displayed full offset ahead. No flags in view. Frequency and course selected were verified correct. ATC gave a heading of 270 degree and climb 4000'. We were vectored for another approach and it was completed uneventfully. In trying to determine what had happened we were slow in instigating the go around.

Original NASA ASRS Text

Title: ACR MLG NOTED LOC FLUCTUATION NEAR LOC INTERCEPT FOR RWY 14R AT ORD. APCH CTLR VECTORED ACFT AWAY FROM LOC FOR SECOND APCH.

Narrative: FLT WAS GIVEN AN INTERCEPT HDG AND CLRED FOR ILS APCH 14R (ORD). AT POINT OF INTERCEPT CAPT'S AND F/O'S HSI DISPLAY OF LOC OSCILLATED PLUS OR MINUS 1 1/2 DOTS AND DISPLAYED FULL OFFSET BEHIND. ONLY SECONDS LATER TO DISPLAYED FULL OFFSET AHEAD. NO FLAGS IN VIEW. FREQ AND COURSE SELECTED WERE VERIFIED CORRECT. ATC GAVE A HDG OF 270 DEG AND CLIMB 4000'. WE WERE VECTORED FOR ANOTHER APCH AND IT WAS COMPLETED UNEVENTFULLY. IN TRYING TO DETERMINE WHAT HAD HAPPENED WE WERE SLOW IN INSTIGATING THE GO AROUND.

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.