1. The P-40 travels 50 to 60 mph faster than the AT-6, so you have to check your time intervals more closely and carefully. Bear in mind that your IAS increases 270 every 1000 feet. If your airspeed indicator shows 200 mph at 15,000 feet, you are actually traveling at a groundspeed of 260 mph (with no wind).. 2. When you are planning to make a cross country flight, draw a penciled line along your proposed route and follow it as closely as possible. Mark cheek points on the penciled line at approximately 15-minute intervals. For check points, choose large, easily identified landmarks, because your speed makes it necessary to recognize landmarks in a hurry. Rivers, railroad tracks and towns make good check points. 3. Do not fly in bad weather over unfamiliar terrain unless it is absolutely necessary. 4. Know the capacity of each fuel tank and how long it takes

to consume the fuel in each tank at the 50-60 gallon per hour normal rate with a constant power setting. Remember that information flying, when your power setting constantly changes, your fuel consumption is considerably greater than during normal level flight. Plan no flight longer than 2 hours unless you carry a belly tank. If you are flying with a belly tank, use it first. The 75- gallon belly tank normally lasts about 1 hour and 10 minutes. Check the proper functioning of all fuel tanks on the ground; immediately after the takeoff fly I minute on each tank to make sure it is working right. 5. Learn to use radio navigation aids; they may save your life someday. The Technical Order 30-100 series, which you have, deals in great detail with radio navigational aids. It pays to spend some time studying these Technical Orders. The more you know about navigation, the better your chances of getting there and back.