Localizer on ILS runway 8 at phx allegedly erratic.

Attributes
ACN	198103
Time
Date	199112
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : phx
State Reference	AZ
Altitude	msl bound lower : 1500 msl bound upper : 1500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : phx tower : ord
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent : approach descent other landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : instrument pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 8500 flight time type : 500
ASRS Report	198103
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : atp pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : became reoriented
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation
Situations
Navigational Aid	Unspecified

Narrative:

On ILS approach to runway 8R at phx, localizer became unreliable with localizer light on instrument comparator. Since we had ground contact and airport in sight, continued approach. Checked identify on 108.3 and heard FM radio station. Mechanic said this is normal on rainy days. Mechanic said at least 5 aircraft had same problem in past 2 days. Interference from local FM station should be investigated.

Original NASA ASRS Text

Title: LOC ON ILS RWY 8 AT PHX ALLEGEDLY ERRATIC.

Narrative: ON ILS APCH TO RWY 8R AT PHX, LOC BECAME UNRELIABLE WITH LOC LIGHT ON INST COMPARATOR. SINCE WE HAD GND CONTACT AND ARPT IN SIGHT, CONTINUED APCH. CHKED IDENT ON 108.3 AND HEARD FM RADIO STATION. MECH SAID THIS IS NORMAL ON RAINY DAYS. MECH SAID AT LEAST 5 ACFT HAD SAME PROBLEM IN PAST 2 DAYS. INTERFERENCE FROM LCL FM STATION SHOULD BE INVESTIGATED.

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.