Air carrier mdt lost electric trim during climb. System corrected itself 15 min later.

Attributes
ACN	155051
Time
Date	199008
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : bae
State Reference	WI
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mke tower : sna
Operator	common carrier : air carrier
Make Model Name	Medium Transport, High Wing, 2 Turboprop Eng
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 220 flight time total : 10000 flight time type : 800
ASRS Report	155051
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	aircraft : equipment problem dissipated
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Captain's air data computer failed simultaneously with a pitch trim asymmetry failure, no pitch trim or stand by pitch trim was available. Problem corrected itself 13 mins later. We suspect a #26 vacuum inverter failed temporarily. Why is there no back up power supply to the electric trim with this inverter failure.

Original NASA ASRS Text

Title: ACR MDT LOST ELECTRIC TRIM DURING CLIMB. SYSTEM CORRECTED ITSELF 15 MIN LATER.

Narrative: CAPT'S AIR DATA COMPUTER FAILED SIMULTANEOUSLY WITH A PITCH TRIM ASYMMETRY FAILURE, NO PITCH TRIM OR STAND BY PITCH TRIM WAS AVAILABLE. PROB CORRECTED ITSELF 13 MINS LATER. WE SUSPECT A #26 VACUUM INVERTER FAILED TEMPORARILY. WHY IS THERE NO BACK UP PWR SUPPLY TO THE ELECTRIC TRIM WITH THIS INVERTER 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.