DC10-30 cites fatigue and WX for 2 altdevs on gars in severe turbulence.

Attributes
ACN	439156
Time
Date	199905
Day	Wed
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : mem.airport
State Reference	TN
Altitude	msl bound lower : 7000 msl bound upper : 7600
Environment
Flight Conditions	IMC
Weather Elements	Thunderstorm Turbulence
Light	Night
Aircraft 1
Controlling Facilities	tracon : mem.tracon
Operator	common carrier : air carrier
Make Model Name	DC-10 30F
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : flight engineer pilot : instrument pilot : multi engine pilot : atp pilot : commercial
Experience	flight time total : 2500
ASRS Report	439156
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : turbulence inflight encounter : weather non adherence : clearance non adherence : far
Independent Detector	aircraft equipment : altitude alert other flight crewa
Resolutory Action	controller : issued new clearance flight crew : returned to assigned airspace
Supplementary
Problem Areas	Flight Crew Human Performance Weather Environmental Factor
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

At the final portion of a long international flight, we were recovering at nighttime with poor WX (severe thunderstorms in area) and minimum fuel. The approach was discontinued on final due to the report of microbursts at the airfield. On the missed approach, the flight encountered severe turbulence and severe WX. During this missed approach, 2 altitude excursions occurred in attempts to level off. Each occurred while given an assigned altitude and the aircraft was flown through the assigned altitude by approximately 500-600 ft. Fatigue was most likely to be a causal factor while operating in a demanding situation with extreme WX conditions.

Original NASA ASRS Text

Title: DC10-30 CITES FATIGUE AND WX FOR 2 ALTDEVS ON GARS IN SEVERE TURB.

Narrative: AT THE FINAL PORTION OF A LONG INTL FLT, WE WERE RECOVERING AT NIGHTTIME WITH POOR WX (SEVERE TSTMS IN AREA) AND MINIMUM FUEL. THE APCH WAS DISCONTINUED ON FINAL DUE TO THE RPT OF MICROBURSTS AT THE AIRFIELD. ON THE MISSED APCH, THE FLT ENCOUNTERED SEVERE TURB AND SEVERE WX. DURING THIS MISSED APCH, 2 ALT EXCURSIONS OCCURRED IN ATTEMPTS TO LEVEL OFF. EACH OCCURRED WHILE GIVEN AN ASSIGNED ALT AND THE ACFT WAS FLOWN THROUGH THE ASSIGNED ALT BY APPROX 500-600 FT. FATIGUE WAS MOST LIKELY TO BE A CAUSAL FACTOR WHILE OPERATING IN A DEMANDING SIT WITH EXTREME WX CONDITIONS.

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.