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Sigma-Tek Vacuum Attitude Indicator 5000B-54. The Sigma Tek air-operated artificial horizon indicator 1U149-010-4 is selected as standard equipment by aircraft manufacturers worldwide. The Sigma-Tek Vacuum Attitude Indicator 5000B-54 artificial horizon displays aircraft attitude through 360 degrees in pitch. Its pictorial presentation gives faster interpretation of airplane attitude with blue for sky and brown for ground. Pictorial airplane remains fixed during gyro operation, adjustable to compensate for changing conditions. Also available with warning flag to alert pilot to loss of pneumatic power.