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Private pilot of small aircraft single engine land engine aircraft overshot climb altitude assignment due to erroneous altitude and airspeed indications resulting from an iced-over pitot tube.
| Attributes | |
| ACN | 231787 |
| Time | |
| Date | 199301 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : mke |
| State Reference | WI |
| Altitude | msl bound lower : 14000 msl bound upper : 16000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau tower : iah |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft, Low Wing, 1 Eng, Retractable Gear |
| Flight Phase | climbout : intermediate altitude cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : private pilot : instrument |
| Experience | flight time last 90 days : 30 flight time total : 480 flight time type : 230 |
| ASRS Report | 231787 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : overshoot inflight encounter other other anomaly other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
Plane outside for 2 weeks in wi -- snow covered day prior to departure. Had plane deiced and placed in heated hangar by FBO. Plane preflted without noticing of problem. Departure unremarkable. Autoplt on and climb rate 500-600 FPM. About 12-15 min into flight, nearing milwaukee, noted low airspeed. Broke altitude 15000 ft. Pitot heat on at takeoff and in flight. Required 2-3 mins to get things sorted out -- some significant altitude variations. Alternate air selected -- no further problem. Landed milwaukee, kept plane in heated hangar. 'Drained' checked line in am, all ok. Departed for remainder of flight to detroit area without further incident. No plane or property damage. Personal performance problem of not early recognition (did not expect in view of heated hangar, preflight, etc). Most perplexing part was that I did not fly plane well during that few mins -- outcome ok.
Original NASA ASRS Text
Title: PVT PLT OF SMA SINGLE ENG LAND ENG ACFT OVERSHOT CLB ALT ASSIGNMENT DUE TO ERRONEOUS ALT AND AIRSPD INDICATIONS RESULTING FROM AN ICED-OVER PITOT TUBE.
Narrative: PLANE OUTSIDE FOR 2 WKS IN WI -- SNOW COVERED DAY PRIOR TO DEP. HAD PLANE DEICED AND PLACED IN HEATED HANGAR BY FBO. PLANE PREFLTED WITHOUT NOTICING OF PROB. DEP UNREMARKABLE. AUTOPLT ON AND CLB RATE 500-600 FPM. ABOUT 12-15 MIN INTO FLT, NEARING MILWAUKEE, NOTED LOW AIRSPD. BROKE ALT 15000 FT. PITOT HEAT ON AT TKOF AND IN FLT. REQUIRED 2-3 MINS TO GET THINGS SORTED OUT -- SOME SIGNIFICANT ALT VARIATIONS. ALTERNATE AIR SELECTED -- NO FURTHER PROB. LANDED MILWAUKEE, KEPT PLANE IN HEATED HANGAR. 'DRAINED' CHKED LINE IN AM, ALL OK. DEPARTED FOR REMAINDER OF FLT TO DETROIT AREA WITHOUT FURTHER INCIDENT. NO PLANE OR PROPERTY DAMAGE. PERSONAL PERFORMANCE PROB OF NOT EARLY RECOGNITION (DID NOT EXPECT IN VIEW OF HEATED HANGAR, PREFLT, ETC). MOST PERPLEXING PART WAS THAT I DID NOT FLY PLANE WELL DURING THAT FEW MINS -- OUTCOME OK.
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.