IAP ILS approach problem. Vertical navigation problem in small aircraft. Altitude deviation altitude overshot in descent.

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Attributes
ACN	292894
Time
Date	199412
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : pdk
State Reference	GA
Altitude	msl bound lower : 1900 msl bound upper : 2900
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	tower : pdk tower : mci
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	approach : straight in
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : cfi pilot : commercial
Experience	flight time last 90 days : 55 flight time total : 2200 flight time type : 440
ASRS Report	292894
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : crossing restriction not met non adherence : far non adherence : clearance non adherence : published procedure other spatial deviation
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : exited adverse environment other
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was having difficulty receiving the ILS GS (radio now under repair), so I decided to fly the localizer approach and I descended below the GS without notifying ATC. The tower called me 1000 ft low at the OM (that is correct). I was intimidated by how busy the controllers were, and I was tired. I should have 'confessed.' I distracted and alarmed ATC.

Original NASA ASRS Text

Title: IAP ILS APCH PROB. VERT NAV PROB IN SMA. ALTDEV ALT OVERSHOT IN DSCNT.

Narrative: I WAS HAVING DIFFICULTY RECEIVING THE ILS GS (RADIO NOW UNDER REPAIR), SO I DECIDED TO FLY THE LOC APCH AND I DSNDED BELOW THE GS WITHOUT NOTIFYING ATC. THE TWR CALLED ME 1000 FT LOW AT THE OM (THAT IS CORRECT). I WAS INTIMIDATED BY HOW BUSY THE CTLRS WERE, AND I WAS TIRED. I SHOULD HAVE 'CONFESSED.' I DISTRACTED AND ALARMED ATC.

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.