Final answer:
The sources of 10th-stage and 14th-stage bleed air are the corresponding compressor stages of an aircraft's engines, which provide pressurized air for various aircraft systems.
Step-by-step explanation:
The student’s question refers to the sources of bleed air in aircraft systems, specifically the 10th-stage and 14th-stage bleed air. This question falls within the field of aerospace engineering, as it involves the understanding of pneumatic systems in aircraft. Bleed air in an aircraft is typically sourced from the engines' compressor stages. The 10th and 14th stages correspond to different pressure levels where air can be extracted for use in cabin pressurization, air conditioning, de-icing, and other pneumatic requirements of the aircraft. Each stage represents a point in the engine's compression process where air may be tapped according to its pressure and temperature characteristics suitable for the specific on-board system needs.