Flight crew of an medium large transport air carrier aircraft descended below final approach altitude prior to final approach fix due to a malfunctioning DME.

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Attributes
ACN	259215
Time
Date	199312
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : clt
State Reference	NC
Altitude	msl bound lower : 2000 msl bound upper : 2000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : clt
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : cfi pilot : atp
Experience	flight time last 90 days : 180 flight time total : 13500 flight time type : 3000
ASRS Report	259215
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance non adherence : published procedure
Independent Detector	other controllera
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	Other Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

#1 DME malfunctioned. Distance from fix displayed different than ATC radar showed. No flag displayed. ATC cleared us for a back course approach. Departed final altitude on approach after calling fix inbound. Started normal rate of descent. When going through 2100 ft, ATC called 1 mi from fix. We leveled off. At all times we had visual contact with ground and airport environment. DME was replaced by maintenance.

Original NASA ASRS Text

Title: FLC OF AN MLG ACR ACFT DSNDED BELOW FINAL APCH ALT PRIOR TO FINAL APCH FIX DUE TO A MALFUNCTIONING DME.

Narrative: #1 DME MALFUNCTIONED. DISTANCE FROM FIX DISPLAYED DIFFERENT THAN ATC RADAR SHOWED. NO FLAG DISPLAYED. ATC CLRED US FOR A BACK COURSE APCH. DEPARTED FINAL ALT ON APCH AFTER CALLING FIX INBOUND. STARTED NORMAL RATE OF DSCNT. WHEN GOING THROUGH 2100 FT, ATC CALLED 1 MI FROM FIX. WE LEVELED OFF. AT ALL TIMES WE HAD VISUAL CONTACT WITH GND AND ARPT ENVIRONMENT. DME WAS REPLACED BY MAINT.

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.