Had the air conditioner compressor replaced under warranty and just purchased a new compressor in 2014. That's three compressors in 16 years. Also replaced the blower motor and capacitor along with the TXV valve and filter dryer in 2014. The Puron has escape over the winter of 2014 and again in 2015.
The cruising altitude of a 747 depends on weather conditions,  weight of the aircraft, and the amount of traffic on the other  flight levels. Its average cruising altitude i â¦ s around 33,000 feet.
On a Boeing 747-400, the maximum ceiling is 45,000 feet and on the Airbus A320, it is 39,800 feet. So, it varies with the different type of planes concerned. Generally, most airliners could fly at higher altitudes, but they are usually certified to an altitude that gives them a good safety margin.