476a51dda08c5c83e73791877c3d7e99f194231408c62eeeee65035bfa4aad27 Section "Vacuum System Failure" item count differs between passes (3 vs 2); verify nothing was dropped.

Procedures in the Emergency Procedures Checklist portion of this section shown in bold faced type are immediate action items which should be committed to memory.

Turn Pitot heat Switch ON Turn back or change altitude to obtain an outside air temperature that is less conducive to icing. Pull cabin heat control full out & open defroster outlets to obtain maximum windshield defroster airflow. Adjust cabin air control to get maximum defroster heat & airflow. Watch for signs of engine-related icing conditions. An unexplained loss in engine speed could be caused by ice blocking the air intake filter or, in extremely rare instances, ice completely blocking the fuel injection air reference tubes. Change the throttle position to obtain maximum RPM. This may require either advancing or retarding the throttle, dependent on where ice has accumulated in the system. Adjust mixture, as required, for maximum RPM. Plan a landing at the nearest airport. With an extremely rapid ice build up, select a suitable “off airport” landing site. With an ice accumulation of ¼ inch or more on the wing leading edges, be prepared for significantly higher stall speed and a longer landing roll. Leave wing flaps retracted. With a severe ice build up on the horizontal tail, the change in wing wake airflow direction caused by wing flap extension could result in a loss of elevator effectiveness. Open left window and, if practical, scrape ice from the portion of the windshield for visibility in the landing approach. Perform a landing approach using a forward slip, if necessary, for improved visibility. Approach at 65 to 75 KIAS depending upon the amount of the accumulation. Perform a landing in level attitude.

Static Pressure Alternate Source Valve PULL ON Airspeed CONSULT APPROPRIATE CALIBRATED TABLES IN SECTION 5 POH

Approach NORMAL Wing Flaps 30 Touchdown GOOD MAIN TYRE FIRST Hold airplane off flat as long as possible, with aileron control Directional Control MAINTAIN using brake on good wheel as required

Approach NORMAL Wing Flaps AS REQUIRED Touchdown ON MAINS Hold nose wheel off the ground as long as possible When nose wheel touches down, maintain full up elevator as aircraft slows to stop.

Alternator OFF With the alternator side of the master switch off, Compass deviations of as much as 25 may occur. Non essential Electrical Equipment OFF Flight TERMINATE AS SOON AS PRACTICAL

Illumination of “VOLTS” on the annunciator panel may occur during low RPM conditions with an electrical load on the system such as during a low RPM taxi. Under theses conditions, the annunciator will go out at higher RPM. The master switch need not be recycled since an overvoltage condition has not occurred to deactivate the alternator system. Avionics Master Switch OFF Alternator Circuit Breaker (ALT FLD) CHECKED IN Master Switch OFF (BOTH SIDES) Master Switch ON Low Voltage Annunciator (VOLTS) CHECK OFF Avionics Master Switch ON If low voltage annunciator (VOLTS) illuminates again: Alternator OFF Non essential Radio & Electrical Equipment OFF Flight TERMINATE AS SOON AS PRACTICAL

If Vacuum is not within normal operating limits, a failure has occurred in the vacuum system and partial panel procedures may be required for continued flight. Vacuum Gauge CHECK to ensure vacuum within normal operating limits