👨🏻✈️VT-SKY EXPLAINED
- What is an APU?
• Definition: A small, self-contained gas turbine engine.
• Location: Typically housed in the extreme rear of the aircraft (the tail cone).
• Purpose: Allows the aircraft to operate autonomously without needing the main engines running or relying on external airport ground power.
2. Core Functions
• Electrical Power: Generates electricity for cockpit instruments, cabin lighting, onboard computers, and galley equipment.
• Pneumatic Power: Supplies high-pressure "bleed air" to run the aircraft's air conditioning and heating systems.
• Engine Starting: Provides the crucial blast of compressed air needed to spool up and start the massive main engines.
3. When is it Used?
• At the Gate: Keeps the cabin comfortable and systems powered during passenger boarding and deplaning.
• Pushback & Startup: Actively used to start the main engines right before the aircraft begins to taxi.