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A widebody transport cargo transport experienced captain's main pitot static probe icing on test flight.
| Attributes | |
| ACN | 364788 |
| Time | |
| Date | 199703 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : bem |
| State Reference | AL |
| Altitude | msl bound lower : 29000 msl bound upper : 24000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : cfi pilot : atp |
| ASRS Report | 364788 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
Aircraft was to receive a functional test flight after heavy maintenance which lasted 30 days prior to this flight. Aircraft had returned to ramp previously due to a probe heat fail light illumination. The maintenance staff replaced a part with no success. Personnel reported that the probe was hot and that we had an 'indication' problem. The flight departed normally and climbed to high altitude to perform some tests. With the autoplt engaged and 'IAS hold' selected the aircraft entered a heavy rain shower. Very soon thereafter the captain's indicated airspeed started to increase quickly. The captain and first officer noted a speed differential of 60 KTS between instruments. We both realized that the probe heater was indeed failed and had frozen closed in the icy rain.
Original NASA ASRS Text
Title: A WDB CARGO TRANSPORT EXPERIENCED CAPT'S MAIN PITOT STATIC PROBE ICING ON TEST FLT.
Narrative: ACFT WAS TO RECEIVE A FUNCTIONAL TEST FLT AFTER HVY MAINT WHICH LASTED 30 DAYS PRIOR TO THIS FLT. ACFT HAD RETURNED TO RAMP PREVIOUSLY DUE TO A PROBE HEAT FAIL LIGHT ILLUMINATION. THE MAINT STAFF REPLACED A PART WITH NO SUCCESS. PERSONNEL RPTED THAT THE PROBE WAS HOT AND THAT WE HAD AN 'INDICATION' PROB. THE FLT DEPARTED NORMALLY AND CLBED TO HIGH ALT TO PERFORM SOME TESTS. WITH THE AUTOPLT ENGAGED AND 'IAS HOLD' SELECTED THE ACFT ENTERED A HVY RAIN SHOWER. VERY SOON THEREAFTER THE CAPT'S INDICATED AIRSPD STARTED TO INCREASE QUICKLY. THE CAPT AND FO NOTED A SPD DIFFERENTIAL OF 60 KTS BTWN INSTS. WE BOTH REALIZED THAT THE PROBE HEATER WAS INDEED FAILED AND HAD FROZEN CLOSED IN THE ICY RAIN.
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.