TM 1-1520-240-109-1-29/(9-1-30 blank)9-1-76. Dual AFCS Failure.AFCSSYSTEMSELswitch —OFF.If IMC;Land as soon as practicable.9-1-77. Vertical Gyro (VGI) Malfunction.A vertical gyro malfunction will be indicated by an attitudeindicator failure, an AFCS OFF caution, and attitudetransients. If a vertical gyro failure occurs, proceed asfollows:CAUTIONFailure of the No. 1 vertical gyro with altitudehold engaged may result in an altituderunaway. If this occurs, disengage ALTHOLD.NOTEFailure of a vertical gyro results in loss of itsassociated AFCS and should be treated as asingle AFCS failure.1. Airspeed—100KIASorVne,whicheverisslower.2. Affected VGI switch — EMER.3. AFCS — Select remaining system.9-1-78. Differential Airspeed Hold Failure (DASH).Differential airspeed hold failure will be recognized bypitch attitude deviations. If DASH failure occurs, avoidnose high attitudes.9-1-79. Cockpit-Control Driver Actuator (CCDA)Failure.1. THRUST CONT lever — Slip as required.2. RADALT/BARO ALT switch—DISEN-GAGED.
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