Airspeed indicator problem on takeoff.

Attributes
ACN	265166
Time
Date	199402
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : cdc
State Reference	UT
Altitude	agl bound lower : 0 agl bound upper : 500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	climbout : initial climbout : takeoff ground other : taxi
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 100 flight time total : 4200 flight time type : 400
ASRS Report	265166
Events
Anomaly	aircraft equipment problem : critical non adherence : published procedure
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

Aircraft parked overnight. There had been snow flurries but both pitot tube covers were on. Before takeoff checklist has a pitot heat -- as required -- line, but even though temperature was below freezing, since there was no visible moisture, I decided to leave it off. During the takeoff roll, airspeed increased normally and then stagnated around 60. I turned on the pitot heat and continued the takeoff, rotating to a normal takeoff attitude, and once in the climb, maintaining climb altitude using the attitude indicator. Once in the climb I started xchking airspeed with indicator on right side of panel. My airspeed readout returned to normal within 30 seconds of turning of pitot heat.

Original NASA ASRS Text

Title: AIRSPD INDICATOR PROB ON TKOF.

Narrative: ACFT PARKED OVERNIGHT. THERE HAD BEEN SNOW FLURRIES BUT BOTH PITOT TUBE COVERS WERE ON. BEFORE TKOF CHKLIST HAS A PITOT HEAT -- AS REQUIRED -- LINE, BUT EVEN THOUGH TEMP WAS BELOW FREEZING, SINCE THERE WAS NO VISIBLE MOISTURE, I DECIDED TO LEAVE IT OFF. DURING THE TKOF ROLL, AIRSPD INCREASED NORMALLY AND THEN STAGNATED AROUND 60. I TURNED ON THE PITOT HEAT AND CONTINUED THE TKOF, ROTATING TO A NORMAL TKOF ATTITUDE, AND ONCE IN THE CLB, MAINTAINING CLB ALT USING THE ATTITUDE INDICATOR. ONCE IN THE CLB I STARTED XCHKING AIRSPD WITH INDICATOR ON R SIDE OF PANEL. MY AIRSPD READOUT RETURNED TO NORMAL WITHIN 30 SECONDS OF TURNING OF PITOT HEAT.

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.