Medium large transport descends below normal glide path on a coupled approach due to a malfunctioning navigation radio receiver. Laas (low altitude alert system) catches aircraft deviation.

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Attributes
ACN	234820
Time
Date	199302
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : mem
State Reference	TN
Altitude	msl bound lower : 1200 msl bound upper : 1500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : mem
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	descent : approach
Route In Use	approach : straight in
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 225 flight time total : 6900 flight time type : 3900
ASRS Report	234820
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 17450 flight time type : 9000
ASRS Report	234767
Events
Anomaly	aircraft equipment problem : critical altitude deviation : overshoot other anomaly other other spatial deviation
Independent Detector	atc equipment other atc equipment : unspecified
Resolutory Action	flight crew : exited adverse environment other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

Autoplt captured and tracked an erroneous signal caused by a malfunctioning navigation receiver. All aircraft indications were normal. This incident proved once again that crews cannot drop their vigilance while operating automated aircraft -- this aircraft being an medium large transport. Aircraft was repaired and I was reminded of the old 'fly the aircraft first' saying. Many thanks to the memphis tower and approach folks for their valued assistance!

Original NASA ASRS Text

Title: MLG DSNDS BELOW NORMAL GLIDE PATH ON A COUPLED APCH DUE TO A MALFUNCTIONING NAV RADIO RECEIVER. LAAS (LOW ALT ALERT SYS) CATCHES ACFT DEV.

Narrative: AUTOPLT CAPTURED AND TRACKED AN ERRONEOUS SIGNAL CAUSED BY A MALFUNCTIONING NAV RECEIVER. ALL ACFT INDICATIONS WERE NORMAL. THIS INCIDENT PROVED ONCE AGAIN THAT CREWS CANNOT DROP THEIR VIGILANCE WHILE OPERATING AUTOMATED ACFT -- THIS ACFT BEING AN MLG. ACFT WAS REPAIRED AND I WAS REMINDED OF THE OLD 'FLY THE ACFT FIRST' SAYING. MANY THANKS TO THE MEMPHIS TWR AND APCH FOLKS FOR THEIR VALUED ASSISTANCE!

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.