GE90 Engine Overview

GE90 Engine Overview (B777)

1. Overview

The B777 is powered by two GE90 (or PW/RR depending on the exact variant) high-bypass turbofan engines. A Severe Damage condition implies catastrophic internal failure or separation, severely affecting aerodynamics and hydraulic/electrical systems on the affected side.

2. Components Affected by Severe Damage

• Hydraulic System: Engine-driven pump (EDP) is lost. Backup systems (Demand Pumps) must operate.
• Electrical System: Backup Generator and Main Generator on the affected engine will drop offline. APU or Cross-tie required.
• Pneumatics/Bleed Air: Loss of bleed air from the affected engine. Asymmetry in anti-ice capabilities.

3. Controls and Indicators

• Panel: Forward Aisle Stand (Fuel Control), Glare Shield (Fire Switches)
• EICAS Messages:
  • ENG FAIL L/R
  • ENG THRUST L/R
  • [Related Hydraulic / Electrical faults]

4. Limitations

• FCOM Ref: FCOM Vol 1, L.10
• Max Altitude limits with Single Engine: Check Max Altitudes
• Asymmetric thrust limits on landing.

5. Related Procedures

• Separation
• HYD PRESS SYS C — Center hydraulic loss (EDP failure cascade)
• Engine Inoperative Flight
• Engine Failure Recognition Training