B727-200 first officer had a localizer failure at ILS intercept point.

Attributes
ACN	531591
Time
Date	200111
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lit.airport
State Reference	AR
Altitude	msl single value : 2000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lit.tracon tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	B727-200
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 22l
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : flight engineer pilot : multi engine pilot : cfi pilot : instrument
Experience	flight time last 90 days : 30 flight time total : 7500 flight time type : 500
ASRS Report	531591
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	altitude deviation : excursion from assigned altitude other anomaly other other spatial deviation
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : anomaly accepted other
Consequence	other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

Operating B727 dfw to lit, nov/fri/01. As the PF, being radar vectored for ILS runway 22L lit, an off navigation flag was observed on my side on base turn approaching final approach course. As the course was alive on the captain's side, my side remained navigation off. I tried to intercept the course looking over at the captain's instruments but proved to be very difficult. Eventually, the captain took over the controls and established us on course. In the process, we descended slightly below assigned 2000 ft -- I would guess to about 1800 ft. I feel in the future, a better decision is to give the aircraft over to the captain sooner.

Original NASA ASRS Text

Title: B727-200 FO HAD A LOC FAILURE AT ILS INTERCEPT POINT.

Narrative: OPERATING B727 DFW TO LIT, NOV/FRI/01. AS THE PF, BEING RADAR VECTORED FOR ILS RWY 22L LIT, AN OFF NAV FLAG WAS OBSERVED ON MY SIDE ON BASE TURN APCHING FINAL APCH COURSE. AS THE COURSE WAS ALIVE ON THE CAPT'S SIDE, MY SIDE REMAINED NAV OFF. I TRIED TO INTERCEPT THE COURSE LOOKING OVER AT THE CAPT'S INSTS BUT PROVED TO BE VERY DIFFICULT. EVENTUALLY, THE CAPT TOOK OVER THE CTLS AND ESTABLISHED US ON COURSE. IN THE PROCESS, WE DSNDED SLIGHTLY BELOW ASSIGNED 2000 FT -- I WOULD GUESS TO ABOUT 1800 FT. I FEEL IN THE FUTURE, A BETTER DECISION IS TO GIVE THE ACFT OVER TO THE CAPT SOONER.

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.