The 360-degree diffuser on the pneumatic starter exhausts air from the starter to which location?

The 360-degree diffuser on the pneumatic starter exhausts air from the starter to which location?

• A. The exhaust stack.
• B. Engine enclosure.
• C. The compressor inlet.
• D. The atmosphere.

Answer: (B)

The starting air is hot and high-velocity, so its exhaust is kept inside the engine area to manage heat, noise, and flow safely. A 360-degree diffuser spreads that exhaust evenly around the starter and directs it into the engine enclosure, where the aircraft’s ventilation paths can carry it away and dissipate the energy. Venting to the outside or into the compressor inlet would either expose components and personnel to hot air or contaminate the intake, and sending it to an exhaust stack would simply dump the energy outside without leveraging the engine’s enclosure to cool and remove it. So, the exhaust is directed into the engine enclosure to be safely absorbed and vented by the surrounding enclosure.

The starting air is hot and high-velocity, so its exhaust is kept inside the engine area to manage heat, noise, and flow safely. A 360-degree diffuser spreads that exhaust evenly around the starter and directs it into the engine enclosure, where the aircraft’s ventilation paths can carry it away and dissipate the energy. Venting to the outside or into the compressor inlet would either expose components and personnel to hot air or contaminate the intake, and sending it to an exhaust stack would simply dump the energy outside without leveraging the engine’s enclosure to cool and remove it. So, the exhaust is directed into the engine enclosure to be safely absorbed and vented by the surrounding enclosure.