Final answer:
Bleed air from the APU does not typically reach the 10th or 14th-stage ducts of jet engines, as these stages belong to the main engines' high-pressure compressors, and the APU operates independently.
Step-by-step explanation:
The question asks whether bleed air from the Auxiliary Power Unit (APU) can reach the 10th-stage duct, the 14th-stage duct, or neither. The APU is an engine used on aircraft to provide energy for functions other than propulsion. It supplies pneumatic power for air-conditioning, main engine starting, and electrical power when the main engines are not running. It is important to understand that in the context of aerospace engineering, the term 'stage' typically refers to the compressor stages in a jet engine. However, bleed air systems and their path can vary by aircraft model.
In general, the APU is not associated with the high-pressure compressor stages identified as '10th stage' or '14th stage'. These stages are within the main engines and are different from the areas where APU bleed air is extracted. Therefore, the correct answer here would typically be (d) Neither duct as the APU bleed air system is independent of the high-pressure compressor stages in the main engines where the 10th and 14th stages would be located.