Runway conditions on landing result in loss of aircraft control and runway excursion.

Attributes
ACN	139720
Time
Date	199003
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : pdk
State Reference	GA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	IMC
Light	Dusk
Aircraft 1
Operator	general aviation : instructional
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	landing other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 34 flight time total : 8500 flight time type : 1600
ASRS Report	139720
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Events
Anomaly	inflight encounter : weather other anomaly other anomaly other other anomaly other other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	Other
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	other

Narrative:

I was cleared for an ILS approach, 20L, with a sidestep to 20R, disabled aircraft on 20L. Thunderstorms reported with light rain, light wind from northeast. Upon commencing approach, tower reported dark area north of airport with visibility approximately 3/4 mi. After breaking out, the sidestep was made with a severe wind from the west, T/D was made in center of runway. Aircraft then hydroplaned to the left onto the grassy midfield area. Brought to a stop and taxied to taxiway F with no problem. It was discovered by ground crew witnesses at runway during T/D that this runway was flooded with several inches of water and had been like this for several hours prior. The runway condition and the severe wind shift were not reported to me at the approach. No damage was done to the aircraft or any runway fixtures. Airport manager consulted.

Original NASA ASRS Text

Title: RWY CONDITIONS ON LNDG RESULT IN LOSS OF ACFT CONTROL AND RWY EXCURSION.

Narrative: I WAS CLRED FOR AN ILS APCH, 20L, WITH A SIDESTEP TO 20R, DISABLED ACFT ON 20L. TSTMS RPTED WITH LIGHT RAIN, LIGHT WIND FROM NE. UPON COMMENCING APCH, TWR RPTED DARK AREA N OF ARPT WITH VISIBILITY APPROX 3/4 MI. AFTER BREAKING OUT, THE SIDESTEP WAS MADE WITH A SEVERE WIND FROM THE W, T/D WAS MADE IN CENTER OF RWY. ACFT THEN HYDROPLANED TO THE LEFT ONTO THE GRASSY MIDFIELD AREA. BROUGHT TO A STOP AND TAXIED TO TXWY F WITH NO PROB. IT WAS DISCOVERED BY GND CREW WITNESSES AT RWY DURING T/D THAT THIS RWY WAS FLOODED WITH SEVERAL INCHES OF WATER AND HAD BEEN LIKE THIS FOR SEVERAL HRS PRIOR. THE RWY CONDITION AND THE SEVERE WIND SHIFT WERE NOT RPTED TO ME AT THE APCH. NO DAMAGE WAS DONE TO THE ACFT OR ANY RWY FIXTURES. ARPT MGR CONSULTED.

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.