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.
Performance 747-100 - Max speed 967km/h (522kt), economical cruising speed 907km/h (490kt). Range with 385 pax and reserves 9045km (4880nm). 747-200B-Max speed 981km/h (530kt) (with RR engines), economical cruising speed 907km/h (490kt).