Air Conditioning / Pressurization / Ventilation

• System Overview — Air Conditioning, Pressurisation & Ventilation
• Main Airflow — Single-Line Walk-Through
• Pack Working Principles — The Air Cycle
• Pressurisation Principles — Cabin Altitude Schedule & Differential Pressure
• Ventilation Principles — Six Objects, Two Controllers
• Cargo Environmental Control — 21-40 / 21-45 + Fire Interlock
• Pack Flow Control Valve — Engineering Deep Dive
• Air Cycle Machine — Engineering Deep Dive
• Pack Controller — Engineering Details
• Zone Controller / Trim Air / Hot Air — Engineering Details
• Mixer Unit / Recirculation Fans / Filters — Engineering Details
• Cabin Pressure Controller — The Brain of Pressurisation
• Outflow Valves — Engineering Details
• Safety Valves, Negative-Relief Valve & RPCU — The Mechanical Backstop
• Avionics Equipment Ventilation — AEVC, Blowing & Extraction
• Cabin, Pack-Bay, Battery & Lav/Galley Ventilation — The Other Objects
• Cargo Ventilation — The Three Lower-Deck Compartments
• Cross-System Interfaces — ATA 21 as a Central Node
• Physical Layout — Where the Parts Live
• ECAM COND & BLEED Pages — Reading the Fields
• ECAM CAB PRESS Page & the ATA 21 Warning Matrix
• Single Pack Failure — The Full Spectrum
• Dual Pack Failure — RAM AIR & Emergency Descent
• Automatic Pressurisation Failure — CPC & Manual Mode
• Excess Cabin Altitude & Emergency Descent
• ΔP Faults — Residual Pressure, Negative ΔP & Profile Anomalies
• Smoke & Fumes — SMOKE/FUMES & AVNCS SMOKE
• Ventilation Faults & Cargo-Fire Interaction
• Ditching — The DITCHING Pushbutton & Special Scenarios
• MEL & Dispatch — Flying with an ATA 21 Defect
• A Typical Day — ATA 21 Through a Flight
• The Pilot's Maintenance View