Pilot of C172 continues practice ILS approach despite difficulty in getting an appropriate HSI display due to not switching from GPS to radio mode.

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Attributes
ACN	692163
Time
Date	200603
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mqj.airport
State Reference	IN
Altitude	msl single value : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ind.tracon tower : las.tower
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Navigation In Use	ils localizer & glide slope : 25
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 30 flight time total : 254 flight time type : 60
ASRS Report	692163
Events
Anomaly	aircraft equipment problem : less severe non adherence : far non adherence : published procedure other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : vor receiver other flight crewa
Resolutory Action	none taken : anomaly accepted
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance Weather
Primary Problem	Flight Crew Human Performance

Narrative:

I was on radar vectors for the ILS runway 25 approach at mqj and was cleared for the approach. I was not getting a reading on the HSI for the localizer because I had not switched it over to navigation from GPS. I was over the outer marker so I descended to VFR. Still confused as to why I had not picked up the localizer; I tuned navigation 2 into the ILS. This showed full scale deflection to the right of course; which confirmed my position (the HSI on GPS indicated I was to the left of course). As I was in VFR; I continued visually to the airport; executed a miss and continued my flight. As I was on the ILS I should have gone missed as soon as I realized I was full deflection. The reason for this error was primarily the fact that I had not flown in IMC for four months. This led to a rookie mistake in not putting navigation input into the HSI. Also; my lack of recent experience and a desire to not look bad in front of the controllers led me to continue visually to the airport rather than immediately executing a missed approach after I had discovered my error.

Original NASA ASRS Text

Title: PLT OF C172 CONTINUES PRACTICE ILS APCH DESPITE DIFFICULTY IN GETTING AN APPROPRIATE HSI DISPLAY DUE TO NOT SWITCHING FROM GPS TO RADIO MODE.

Narrative: I WAS ON RADAR VECTORS FOR THE ILS RWY 25 APCH AT MQJ AND WAS CLRED FOR THE APCH. I WAS NOT GETTING A READING ON THE HSI FOR THE LOCALIZER BECAUSE I HAD NOT SWITCHED IT OVER TO NAV FROM GPS. I WAS OVER THE OUTER MARKER SO I DSNDED TO VFR. STILL CONFUSED AS TO WHY I HAD NOT PICKED UP THE LOC; I TUNED NAV 2 INTO THE ILS. THIS SHOWED FULL SCALE DEFLECTION TO THE R OF COURSE; WHICH CONFIRMED MY POSITION (THE HSI ON GPS INDICATED I WAS TO THE L OF COURSE). AS I WAS IN VFR; I CONTINUED VISUALLY TO THE ARPT; EXECUTED A MISS AND CONTINUED MY FLT. AS I WAS ON THE ILS I SHOULD HAVE GONE MISSED AS SOON AS I REALIZED I WAS FULL DEFLECTION. THE REASON FOR THIS ERROR WAS PRIMARILY THE FACT THAT I HAD NOT FLOWN IN IMC FOR FOUR MONTHS. THIS LED TO A ROOKIE MISTAKE IN NOT PUTTING NAV INPUT INTO THE HSI. ALSO; MY LACK OF RECENT EXPERIENCE AND A DESIRE TO NOT LOOK BAD IN FRONT OF THE CTLRS LED ME TO CONTINUE VISUALLY TO THE ARPT RATHER THAN IMMEDIATELY EXECUTING A MISSED APCH AFTER I HAD DISCOVERED MY ERROR.

Data retrieved from NASA's ASRS site as of January 2009 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.