Final answer:
Brake fans are used on aircraft to cool down the brakes after a flight, especially when parking with a quick turn of less than 30 minutes to ensure brake temperatures are safe for the next flight. The decision to use brake fans is based on brake temperature readings and aircraft operating procedures, considering factors like ambient temperature and the aircraft's previous use.
Step-by-step explanation:
The question asked about the procedure for using the brake fans on an aircraft when parking for a short duration, specifically a turn of less than 30 minutes. In aviation, particularly in terms of aircraft operations and maintenance, managing brake temperatures is crucial for safety reasons. The brake fans are used to cool down the brakes after a flight to ensure that the temperatures are within safe levels before the next takeoff. If an aircraft is scheduled to park for a short period, which is less than 30 minutes (quick turn), and the brakes have been used extensively during the last landing, it would be necessary to activate the brake fans to expedite the cooling process.
It is important to note that the decision to use brake fans is often determined by the brake temperature indicators and procedures outlined in the aircraft's operating manual. Typically, pilots or ground engineers would consult these instruments and documents to decide whether brake cooling is necessary. Additionally, ambient temperature, the weight of the aircraft during the last landing, and the taxiing time are also factors that might influence this decision. One should also ensure that the operation of brake fans does not conflict with any maintenance procedures or safety checks being conducted after landing. Turning on the brake fans helps prevent potential brake overheating issues, which could lead to brake fires or compromised brake performance for subsequent flights.