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.
Boeing's tech specs list the 747-200 variant's typical cruise speed at 555 mph and top speed at 594 mph. Wiki lists those numbers specifically for the VC-25A (the actual Air Force designator for the aircraft; Air Force One should only be used when the President is aboard) at 575 and 630 mph, respectively...but they do not cite those numbers.