Airbus Flight Instructor
Airbus · Knowledge Base
APU
- APU Overview — GTCP 331-350C Single-Shaft Gas Turbine, ECB Full Authority
- Power Section — Single Shaft, Two-Stage Compressor, Reverse-Flow Combustor, Three-Stage Turbine
- Load Compressor — Single-Stage Centrifugal, Variable IGV Bleed Source
- Bleed & Surge Air — APU Bleed Valve, Surge Control Valve, 25000 ft Logic
- Fuel System — FCU, Atomizers, Ecology Drain, the IGV/SCV Fuel Supply
- Ignition — High-Energy Dual System, Start 7–50 %, Flameout-Relight 95–50 %
- Starting — Altitude-Dependent Target Speed, Clutch Auto-Disengage, the Start Envelope
- ECB — Full-Authority Digital Control, the Two OBRMs, and Life-Time Data
- Air Intake — Flap Closed When Off, Diverter Ram Recovery, the 15-Minute Open
- Exhaust — Combustion Gas Plus Surge Air, Thermal Management, the FR101 Firewall Seal
- Oil System — Three Sumps, the De-Oil Valve, and Oil-Triggered Auto Shutdowns
- Indicating — Speed in Percent, EGT Rake Averaging, the Self-Erasing APU Page
- Emergency Shutdown — Immediate, No Cooling, and Why It Is Crew-Commanded in Flight
- Automatic Shutdown — The Phase-Dependent Table and the Backup-Source Logic
- Fire, Limits and Interfaces — the Bleed Ceilings, ETOPS Role, and the Fire Zone