Light transport jet freighter at FL310 had instrument failure affecting autoplt. Attempting to regain control by hand flying. Excursioned 500 up and 500 down. Returned to VFR fld at lower altitude.

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Attributes
ACN	196413
Time
Date	199112
Day	Sun
Local Time Of Day	0001 To 0600
Place
Locale Reference	atc facility : psb airport : teb
State Reference	PA
Altitude	msl bound lower : 30500 msl bound upper : 31500
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zob
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi pilot : commercial pilot : instrument
Experience	flight time last 90 days : 110 flight time total : 5000 flight time type : 110
ASRS Report	196413
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : regained aircraft control other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

En route from teb to mdw at cruise altitude of 31000 ft level and autoplt engaged using VLF navigation. Captain's primary instrument vg, dg, flight director and autoplt failed and all flagged. I immediately tried to regain control of aircraft but a high pitch up attitude was created and I was unable to stop the climb prior to going through 31500 and then through 30500 before leveling the aircraft at 31000. After using our checklist we were unable to regain my dg and vg therefore we called center and return to teb which was VFR. We descended to a lower altitude and went into holding to burn down fuel to get to authorized landing weight. Landed at teb uneventfully.

Original NASA ASRS Text

Title: LTT JET FREIGHTER AT FL310 HAD INST FAILURE AFFECTING AUTOPLT. ATTEMPTING TO REGAIN CTL BY HAND FLYING. EXCURSIONED 500 UP AND 500 DOWN. RETURNED TO VFR FLD AT LOWER ALT.

Narrative: ENRTE FROM TEB TO MDW AT CRUISE ALT OF 31000 FT LEVEL AND AUTOPLT ENGAGED USING VLF NAV. CAPT'S PRIMARY INST VG, DG, FLT DIRECTOR AND AUTOPLT FAILED AND ALL FLAGGED. I IMMEDIATELY TRIED TO REGAIN CTL OF ACFT BUT A HIGH PITCH UP ATTITUDE WAS CREATED AND I WAS UNABLE TO STOP THE CLB PRIOR TO GOING THROUGH 31500 AND THEN THROUGH 30500 BEFORE LEVELING THE ACFT AT 31000. AFTER USING OUR CHKLIST WE WERE UNABLE TO REGAIN MY DG AND VG THEREFORE WE CALLED CENTER AND RETURN TO TEB WHICH WAS VFR. WE DSNDED TO A LOWER ALT AND WENT INTO HOLDING TO BURN DOWN FUEL TO GET TO AUTHORIZED LNDG WEIGHT. LANDED AT TEB UNEVENTFULLY.

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.