: Manages cabin air conditioning, heating, and oxygen systems to maintain a safe environment at high altitudes.
| Light | Meaning | Immediate Action | |-------|---------|------------------| | MASTER CAUTION / WARNING | System alert | Press to recall | | FIRE (Engine/APU/Cargo) | Fire detected | Fire handle – pull | | OVHT (Engine) | Engine overheat | Thrust lever idle | | ELEC (GEN OFF BUS, TR UNIT) | Electrical fault | Reset or shed load | | HYD (LOW PRESSURE, OVERHEAT) | Pump failure | Switch off, PTU check | | AIR DUCT LEAK | Bleed leak | Isolate bleed | | PRESSURIZATION AUTO FAIL | Auto controller fail | Switch to STBY | boeing 737800 overhead panel pdf new
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