<< >> NASA ASRS Report 108312, April 1989

Updrafts and severe turbulence encountered which carried aircraft 1200' above assigned altitude. SIGMET issued just prior to incident regarding icing.

Attributes
ACN	108312
Time
Date	198904
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : dqn
State Reference	OH
Altitude	msl bound lower : 11000 msl bound upper : 12500
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	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 : 120 flight time total : 10000
ASRS Report	108312
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : clearance other anomaly
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	Other
Supplementary
Primary Problem	Weather
Air Traffic Incident	Pilot Deviation

Narrative:

Before the flight I received WX briefing. I was told light icing south of route. Pilot reports indicated 'trace of ice'. Leaving effingham, il, and climbing to 11,000', total instruments -- no sign of ice. Between dayton and columbus I met severe turbulence and severe icing. I entered an updraft shaft that took my aircraft 1200' above assigned altitude. Pulling the manifold pressure to 15' and lowering my nose I still continued going up the shaft. Minutes prior to incident center issued a SIGMET 1 regarding icing. After incident center asked my assigned altitude. I replied '11,000' but I was doing all I could to hold aircraft under control.'

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Original NASA ASRS Text

Title: UPDRAFTS AND SEVERE TURBULENCE ENCOUNTERED WHICH CARRIED ACFT 1200' ABOVE ASSIGNED ALT. SIGMET ISSUED JUST PRIOR TO INCIDENT REGARDING ICING.

Narrative: BEFORE THE FLT I RECEIVED WX BRIEFING. I WAS TOLD LIGHT ICING SOUTH OF ROUTE. PLT REPORTS INDICATED 'TRACE OF ICE'. LEAVING EFFINGHAM, IL, AND CLIMBING TO 11,000', TOTAL INSTRUMENTS -- NO SIGN OF ICE. BETWEEN DAYTON AND COLUMBUS I MET SEVERE TURB AND SEVERE ICING. I ENTERED AN UPDRAFT SHAFT THAT TOOK MY ACFT 1200' ABOVE ASSIGNED ALT. PULLING THE MANIFOLD PRESSURE TO 15' AND LOWERING MY NOSE I STILL CONTINUED GOING UP THE SHAFT. MINUTES PRIOR TO INCIDENT CENTER ISSUED A SIGMET 1 REGARDING ICING. AFTER INCIDENT CENTER ASKED MY ASSIGNED ALT. I REPLIED '11,000' BUT I WAS DOING ALL I COULD TO HOLD ACFT UNDER CONTROL.'

Data retrieved from NASA's ASRS site as of August 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.