Final answer:
To compute the ETER to an alternate airfield on the DD Form 175, use the formula ETE = Distance / Groundspeed. Consider the distance to the alternate airfield and the speed of the aircraft.
Step-by-step explanation:
To compute the Est. Time Enroute (ETE) to an alternate airfield on the DD Form 175, you need to consider the distance to the alternate airfield and the speed of the aircraft. The ETE can be calculated using the formula: ETE = Distance / Groundspeed. First, determine the distance to the alternate airfield using navigation tools or charts. Next, determine the groundspeeds of the aircraft, which is the speed of the aircraft relative to the ground. Finally, divide the distance by the groundspeed to get the ETE. For example, if the distance is 100 miles and the groundspeed is 200 knots, the ETE would be 0.5 hours (30 minutes).