ELEC GEN OFF L, R

📚 Sources: QRH 6.5 (R53), FCOM 6.30.1

1. QRH Reference & Condition

• QRH Section: 6.5
• EICAS Level: Advisory
• Condition: The generator control breaker is open.
• Objective: To reset the generator or use the APU to supply another source of power.

2. Non-Normal Checklist

CAUTION

Attempt only one reset per flight.

Step 1 — Generator Reset

Step	Action
1	GEN CTRL switch (affected side) … … Off, then ON

graph TD
    A["ELEC GEN OFF L or R<br/>Advisory"] --> B{"GEN CTRL sw<br/>Off → ON"}
    B -->|"Message blanks"| DONE["■ ■ ■ ■<br/>Checklist Complete"]
    B -->|"Message stays"| C["APU selector<br/>START → ON<br/>(if APU available)"]
    C --> DONE2["■ ■ ■ ■<br/>Checklist Complete"]

If Reset Fails

• Start APU for redundant power source
• The opposite IDG (if available) will power the affected bus via bus tie

3. System Explanation

Generator OFF light illuminates when the generator breaker is open. This can be caused by: (FCOM 6.10.2)

• GEN CTRL switch selected OFF
• Electrical fault detected (auto-trip)

GEN CTRL switch OFF → ON resets fault trip circuitry and recloses the generator breaker if the fault has cleared.

4. Cross-References

• Electrical System — Generator control system
• ELEC AC BUS L, R — Bus unpowered
• ELEC GEN DRIVE L, R — IDG mechanical fault
• ELEC GEN OFF APU — APU generator off