Aircraft Systems

Alternator / Generator Failure in Night VFR

FAA Ref: FAA-S-ACS-6C Area IX Task C (Systems and Equipment Malfunctions)

Scenario & Physics Summary

Immediate electrical load shedding protocol when the ammeter shows negative charge or the ALT WARN light illuminates during night flight.

Interactive 3D Visual Plates & Scenario Media

Alternator / Generator Failure in Night VFR Plate 1

Plate 1: Alternator / Generator Failure in Night VFR

Alternator / Generator Failure in Night VFR Plate 2

Plate 2: Alternator / Generator Failure in Night VFR

Alternator / Generator Failure in Night VFR Plate 3

Plate 3: Alternator / Generator Failure in Night VFR

Alternator / Generator Failure in Night VFR Plate 4

Plate 4: Alternator / Generator Failure in Night VFR

Aerodynamic & Operational Physics

The battery alone provides only 30-45 minutes of reserve power once the alternator drops offline.
Night VFR requires avionics, nav lights, landing light, pitot heat, and instrument backlights—drawing over 20-30 Amps continuously.
Load shed non-essential bus equipment (landing lights until final, secondary radios, interior cabin lighting) immediately to preserve battery for flaps, radio, and transponder.

FAA Exam Gotcha Alert

FAA Exam Trap: Do not re-engage a tripped alternator circuit breaker more than once if it pops immediately, as it indicates a primary short circuit and fire hazard.

Frequently Asked Questions & Exam Explanations

What is the first action when an alternator fails at night?

Check voltage/ammeter, cycle ALT switch once. If it remains offline, immediately load-shed non-essential electrical equipment to preserve battery power for landing.

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