|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||1201 To 1800|
|Locale Reference||atc facility : cle|
|Altitude||msl bound lower : 4000|
msl bound upper : 4000
|Controlling Facilities||tracon : cle|
|Operator||general aviation : personal|
|Make Model Name||Small Aircraft, Low Wing, 1 Eng, Retractable Gear|
|Flight Phase||cruise other|
|Function||flight crew : single pilot|
|Qualification||pilot : cfi|
pilot : atp
|Experience||flight time last 90 days : 50|
flight time total : 8500
flight time type : 75
|Anomaly||aircraft equipment problem : critical|
|Independent Detector||other flight crewa|
|Resolutory Action||flight crew : overcame equipment problem|
|Air Traffic Incident||other|
After level-off at 4000', assigned IFR altitude and IMC pitot heat had been placed on. Approximately 5 mins had passed and signs of airframe ice were noted. The altimeter/airspeed and vertical speed indicator started to fluctuate. Assuming the pitot heat system to be inoperative, I selected the alternate static source. At that time both the altimeter and vertical speed stabilized and I confirmed my altitude with radar mode C. The airspeed indicator seemed to be in error. I continued the flight to destination and landed west/O incident. A request was made to inspect the pitot static system and the heat element.
Original NASA ASRS Text
Title: GA SMA SUSPECTED PITOT STATIC SYSTEM ICE.
Narrative: AFTER LEVEL-OFF AT 4000', ASSIGNED IFR ALT AND IMC PITOT HEAT HAD BEEN PLACED ON. APPROX 5 MINS HAD PASSED AND SIGNS OF AIRFRAME ICE WERE NOTED. THE ALTIMETER/AIRSPD AND VERTICAL SPD INDICATOR STARTED TO FLUCTUATE. ASSUMING THE PITOT HEAT SYS TO BE INOPERATIVE, I SELECTED THE ALTERNATE STATIC SOURCE. AT THAT TIME BOTH THE ALTIMETER AND VERT SPD STABILIZED AND I CONFIRMED MY ALT WITH RADAR MODE C. THE AIRSPD INDICATOR SEEMED TO BE IN ERROR. I CONTINUED THE FLT TO DEST AND LANDED W/O INCIDENT. A REQUEST WAS MADE TO INSPECT THE PITOT STATIC SYS AND THE HEAT ELEMENT.
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.