During an instrument training flight, student loses control of the aircraft due to lack of the attitude instruments resulting from a clogged static source.

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Attributes
ACN	320066
Time
Date	199511
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : drk airport : prc
State Reference	AZ
Altitude	msl bound lower : 11000 msl bound upper : 11000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Operator	general aviation : instructional
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	cruise other other
Route In Use	enroute airway : zab
Flight Plan	IFR
Person 1
Affiliation	Other
Function	instruction : instructor
Qualification	other other : other pilot : cfi pilot : commercial pilot : instrument
Experience	flight time last 90 days : 150 flight time total : 380 flight time type : 300
ASRS Report	320066
Person 2
Affiliation	Other
Function	instruction : trainee
Qualification	pilot : private
Events
Anomaly	aircraft equipment problem : critical inflight encounter : weather other anomaly other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	controller : provided flight assist flight crew : declared emergency flight crew : overcame equipment problem flight crew : regained aircraft control other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

IFR from prc to inw, level at 11000 ft. Center was talking to us and I replied for the student. I was checking for icing and the student got into an unusual attitude. (I saw no ice.) I took the controls and found we had an instrument failure. My first assumption was vacuum failure, ended up being static clog due to water. I asked center for no gyro vectors back to prc and declared an emergency. The unusual attitude was caused by turbulence, static failure and misinterp of instrument. I took control and recovered partial panel. Instrument failure training always consists of vacuum/gyroscope failure. I will now emphasize static failure.

Original NASA ASRS Text

Title: DURING AN INST TRAINING FLT, STUDENT LOSES CTL OF THE ACFT DUE TO LACK OF THE ATTITUDE INSTS RESULTING FROM A CLOGGED STATIC SOURCE.

Narrative: IFR FROM PRC TO INW, LEVEL AT 11000 FT. CTR WAS TALKING TO US AND I REPLIED FOR THE STUDENT. I WAS CHKING FOR ICING AND THE STUDENT GOT INTO AN UNUSUAL ATTITUDE. (I SAW NO ICE.) I TOOK THE CTLS AND FOUND WE HAD AN INST FAILURE. MY FIRST ASSUMPTION WAS VACUUM FAILURE, ENDED UP BEING STATIC CLOG DUE TO WATER. I ASKED CTR FOR NO GYRO VECTORS BACK TO PRC AND DECLARED AN EMER. THE UNUSUAL ATTITUDE WAS CAUSED BY TURB, STATIC FAILURE AND MISINTERP OF INST. I TOOK CTL AND RECOVERED PARTIAL PANEL. INST FAILURE TRAINING ALWAYS CONSISTS OF VACUUM/GYROSCOPE FAILURE. I WILL NOW EMPHASIZE STATIC FAILURE.

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.