Medium large transport overshoots ILS due faulty equipment. ATC calls for turn to re-intercept.

Attributes
ACN	219034
Time
Date	199208
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : atl
State Reference	GA
Altitude	msl bound lower : 5000 msl bound upper : 5000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : atl
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : private
Experience	flight time last 90 days : 225 flight time total : 4000 flight time type : 700
ASRS Report	219034
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Cleared for approach to runway 8L in atl with ILS tuned and idented at 5000 ft MSL. Captain had ILS selected and I was on the VOR for DME information until we were established on final. Approach called us to turn left and re-intercept localizer, we had gone through localizer. Captain's instruments never indicated localizer crossing but instead still showed us north of localizer on a good intercept heading. I immediately selected the ILS and approach was completed uneventfully. Captain's instruments were unusable throughout approach. We wrote up captain's ILS receiver and maintenance found the up-left test button stuck in test position. No off flags were visible and it was impossible for cockpit crew to tell that captain's ILS was in a test mode.

Original NASA ASRS Text

Title: MLG OVERSHOOTS ILS DUE FAULTY EQUIP. ATC CALLS FOR TURN TO RE-INTERCEPT.

Narrative: CLRED FOR APCH TO RWY 8L IN ATL WITH ILS TUNED AND IDENTED AT 5000 FT MSL. CAPT HAD ILS SELECTED AND I WAS ON THE VOR FOR DME INFO UNTIL WE WERE ESTABLISHED ON FINAL. APCH CALLED US TO TURN L AND RE-INTERCEPT LOC, WE HAD GONE THROUGH LOC. CAPT'S INSTS NEVER INDICATED LOC XING BUT INSTEAD STILL SHOWED US N OF LOC ON A GOOD INTERCEPT HDG. I IMMEDIATELY SELECTED THE ILS AND APCH WAS COMPLETED UNEVENTFULLY. CAPT'S INSTS WERE UNUSABLE THROUGHOUT APCH. WE WROTE UP CAPT'S ILS RECEIVER AND MAINT FOUND THE UP-L TEST BUTTON STUCK IN TEST POS. NO OFF FLAGS WERE VISIBLE AND IT WAS IMPOSSIBLE FOR COCKPIT CREW TO TELL THAT CAPT'S ILS WAS IN A TEST MODE.

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.