Cpr aircraft lost 500' when autoplt failed.

Attributes
ACN	148029
Time
Date	199006
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : dal
State Reference	TX
Altitude	msl bound lower : 36500 msl bound upper : 37000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zfw
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 : instrument pilot : atp
Experience	flight time last 90 days : 60 flight time total : 9000 flight time type : 1500
ASRS Report	148029
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Inverter failure caused temperature loss of autoplt, flight directors, and gyro. During reorientation and inverter fail down aircraft loss 500'. Immediately return to FL370 and notified ATC, controller remarked there was no traffic conflict.

Original NASA ASRS Text

Title: CPR ACFT LOST 500' WHEN AUTOPLT FAILED.

Narrative: INVERTER FAILURE CAUSED TEMP LOSS OF AUTOPLT, FLT DIRECTORS, AND GYRO. DURING REORIENTATION AND INVERTER FAIL DOWN ACFT LOSS 500'. IMMEDIATELY RETURN TO FL370 AND NOTIFIED ATC, CTLR REMARKED THERE WAS NO TFC CONFLICT.

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.