## Usable Frequencies 

When planning your flight, study the VFR charts for the frequen› cies and locations to use for making position reports and getting weather updates. In many mountainous areas, Flight Watch will not be usable; so you will need alternatives. In most places, you will be able to reach a flight service station through an RCO or VOR site. Have these frequencies written on your flight log for ready reference when you need them. 

## Winter Operations 

Winter operations at mountain airports may present some things that you aren’t normally faced with in the flatlands. Check the NOTAMs carefully for any unusual runway conditions due to snow, ice, or other hazards. If you will need engine preheat ser› vices or de-ice services, call ahead since some smaller airports do not have these available. Finally, if your destination is a popular ski country airport, you may find parking space limited or simply not available. Again, a call ahead may save a change in plans. 

## Operations During A Cross-country Flight Starting, Taxi, and Run-up 

Starting and taxi at high altitudes are performed as you would at sea level, except you must lean the mixture significantly to avoid fouling the spark plugs. Run-up is also normal except a full power run-up of non turbocharged engines should be used to set mixture for takeoff power. The POH should be followed strictly for tur› bocharged engine operation. 

## Takeoff 

For takeoff, the minimum flap setting recommended by the POH is usually recommended for best performance. A full power check should be performed on the runway. adjusting mixture for best power if necessary, and checking for proper engine RPM, manifold pressure, and fuel flow. As discussed earlier, rotation and liftoff should be at normal indicated airspeeds. It is important not to over rotate to avoid high drag and poor takeoff performance. 

## Climb 

A normal climb profile is usually sufficient for most mountain air› ports you will visit. Your POH should be the guide for selecting the proper speeds for the conditions. For most light aircraft, the 

