Pilot of small aircraft aircraft returning to land for an aircraft equipment problem inadvertently landed below approach minimum.

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Attributes
ACN	232935
Time
Date	199302
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dsm
State Reference	IA
Altitude	agl bound lower : 0 agl bound upper : 2000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dsm
Operator	general aviation : personal
Make Model Name	Small Aircraft
Flight Phase	landing other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : atp
Experience	flight time last 90 days : 30 flight time total : 9000 flight time type : 200
ASRS Report	232935
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	aircraft equipment problem : less severe inflight encounter : weather non adherence : published procedure non adherence : far other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was starting a flight to rap. Right after liftoff I observed a bad tac and requested to return to dsm. Right outside OM I was cleared for the approach and told the RVR was 2600. The RVR went to 2000 then 1300 just before touchdown. I had the rabbit in sight well outside of the MM.

Original NASA ASRS Text

Title: PLT OF SMA ACFT RETURNING TO LAND FOR AN ACFT EQUIP PROB INADVERTENTLY LANDED BELOW APCH MINIMUM.

Narrative: I WAS STARTING A FLT TO RAP. RIGHT AFTER LIFTOFF I OBSERVED A BAD TAC AND REQUESTED TO RETURN TO DSM. RIGHT OUTSIDE OM I WAS CLRED FOR THE APCH AND TOLD THE RVR WAS 2600. THE RVR WENT TO 2000 THEN 1300 JUST BEFORE TOUCHDOWN. I HAD THE RABBIT IN SIGHT WELL OUTSIDE OF THE MM.

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.