Flight crew of air carrier turboprop arriving cle relies on the localizer for runway alignment during a visual approach only to discover that their navigation is indicating improperly, causing them to be off the extended runway centerline by 3 mi.

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Attributes
ACN	138133
Time
Date	199002
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cle
State Reference	OH
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : cle
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Navigation In Use	ils localizer & glide slope : cle Other
Flight Phase	cruise other descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 231 flight time total : 13075 flight time type : 428
ASRS Report	138133
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe non adherence : clearance other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

During approach to cleveland we were given a right base visual entry for a landing to 5R cleveland hopkins. While on the base leg the CDI showed a normal movement towards centerline. I maneuvered the aircraft to a turn to final as per the localizer CDI. Our actual position was 3 mi right of centerline. I wrote up the navigation as being inoperative.

Original NASA ASRS Text

Title: FLT CREW OF ACR TURBOPROP ARRIVING CLE RELIES ON THE LOCALIZER FOR RWY ALIGNMENT DURING A VISUAL APCH ONLY TO DISCOVER THAT THEIR NAVIGATION IS INDICATING IMPROPERLY, CAUSING THEM TO BE OFF THE EXTENDED RWY CENTERLINE BY 3 MI.

Narrative: DURING APCH TO CLEVELAND WE WERE GIVEN A RIGHT BASE VISUAL ENTRY FOR A LNDG TO 5R CLEVELAND HOPKINS. WHILE ON THE BASE LEG THE CDI SHOWED A NORMAL MOVEMENT TOWARDS CENTERLINE. I MANEUVERED THE ACFT TO A TURN TO FINAL AS PER THE LOC CDI. OUR ACTUAL POSITION WAS 3 MI RIGHT OF CENTERLINE. I WROTE UP THE NAV AS BEING INOP.

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.