<< >> NASA ASRS Report 101024, December 1988

ILS indications cause reporter to break out of overcast off course. Reporter believes problem was with ILS signal.

Attributes
ACN	101024
Time
Date	198812
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : jvl
State Reference	IL
Altitude	msl bound lower : 2700 msl bound upper : 2700
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : rfd
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Navigation In Use	ils localizer & glide slope : jvl
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : commercial
Experience	flight time last 90 days : 32 flight time total : 2330 flight time type : 35
ASRS Report	101024
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	aircraft equipment problem : critical other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	other
Situations
Navigational Aid	Unspecified

Narrative:

After being aligned with the ILS the controller had to give me a go around. Aircraft ahead of me was having problems and declared a missed approach. After vectoring I was cleared for the approach and given the tower frequency. After intercepting the G/south the localizer needle began to drift to the right--correcting for the drift did not help. As I was almost to call a missed approach I broke out of IMC much to the right of the normal approach path. I called the tower and was cleared to land. Later I made an ILS approach at another ILS in VFR WX and found my aircraft equipment working normally. I find the jvl ILS is not up to full operating power. Callback conversation with reporter revealed the following: reporter said he did not report the ILS problem to the FAA because he thought it was a problem with his equipment. Later during the day he shot another ILS at another airport in VMC and he said his equipment was fine. He therefore thinks it was a NAVAID problem.

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Original NASA ASRS Text

Title: ILS INDICATIONS CAUSE REPORTER TO BREAK OUT OF OVERCAST OFF COURSE. REPORTER BELIEVES PROBLEM WAS WITH ILS SIGNAL.

Narrative: AFTER BEING ALIGNED WITH THE ILS THE CTLR HAD TO GIVE ME A GAR. ACFT AHEAD OF ME WAS HAVING PROBS AND DECLARED A MISSED APCH. AFTER VECTORING I WAS CLRED FOR THE APCH AND GIVEN THE TWR FREQ. AFTER INTERCEPTING THE G/S THE LOC NEEDLE BEGAN TO DRIFT TO THE RIGHT--CORRECTING FOR THE DRIFT DID NOT HELP. AS I WAS ALMOST TO CALL A MISSED APCH I BROKE OUT OF IMC MUCH TO THE RIGHT OF THE NORMAL APCH PATH. I CALLED THE TWR AND WAS CLRED TO LAND. LATER I MADE AN ILS APCH AT ANOTHER ILS IN VFR WX AND FOUND MY ACFT EQUIP WORKING NORMALLY. I FIND THE JVL ILS IS NOT UP TO FULL OPERATING PWR. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: RPTR SAID HE DID NOT RPT THE ILS PROB TO THE FAA BECAUSE HE THOUGHT IT WAS A PROB WITH HIS EQUIP. LATER DURING THE DAY HE SHOT ANOTHER ILS AT ANOTHER ARPT IN VMC AND HE SAID HIS EQUIP WAS FINE. HE THEREFORE THINKS IT WAS A NAVAID PROB.

Data retrieved from NASA's ASRS site as of August 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.