Air carrier X received erroneous signals from ILS. ATC equipment problem navigation.

Attributes
ACN	294857
Time
Date	199501
Day	Sun
Local Time Of Day	0001 To 0600
Place
Locale Reference	atc facility : lax
State Reference	CA
Altitude	msl bound lower : 2500 msl bound upper : 2500
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : lax
Operator	common carrier : air carrier
Make Model Name	DC-10 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : lax
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 170 flight time total : 20000 flight time type : 929
ASRS Report	294857
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	Other
Supplementary
Primary Problem	Navigational Facility
Air Traffic Incident	other

Narrative:

Air carrier X vector received for arrival for ILS approach. ILS indications determined to be erroneous by 2 aircraft despite monitoring indications of normal. Reported to approach, tower and ground control. Following inquiry indicated reports not logged by tower.

Original NASA ASRS Text

Title: ACR X RECEIVED ERRONEOUS SIGNALS FROM ILS. ATC EQUIP PROB NAV.

Narrative: ACR X VECTOR RECEIVED FOR ARR FOR ILS APCH. ILS INDICATIONS DETERMINED TO BE ERRONEOUS BY 2 ACFT DESPITE MONITORING INDICATIONS OF NORMAL. RPTED TO APCH, TWR AND GND CTL. FOLLOWING INQUIRY INDICATED RPTS NOT LOGGED BY TWR.

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.