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Overload protection with paralleled generators

Aviation Mechanic Powerplant (AMP) practice question 2 of 13 on Engine Electrical Systems. ACS element AM.III.F.K8 · difficulty: standard. Want to answer it in a timed quiz? Use the Aviation Mechanic Powerplant (AMP) practice mode.

Question bank updated 2026-09-22

QUESTIONTwo generators are operated in parallel, and the total connected system load can exceed the rated output of one generator. What must be provided for this installation?

  1. AA means of quickly reducing the total load.
  2. BA third generator for standby power.
  3. CA larger battery to carry the excess demand.
Show the answer and explanation

Correct answer: A. A means of quickly reducing the total load.

  • A — correct The handbook requires a way of quickly coping with sudden overloads caused by generator or engine failure, either a quick load-reduction system or a specified procedure that brings the load within the capacity of the remaining generators.
  • B — incorrect No additional generator is called for; the requirement is a way to shed load down to what the remaining generators can carry.
  • C — incorrect The battery is expected to be kept charged in flight rather than to carry the surplus load after a generator failure.

BACKGROUND

When more than one generator is used in parallel, the total rated output is the combined output of the installed generators. If two or more generators are operated in parallel and the total connected system load can exceed the rated output of one generator, a means must be provided for quickly coping with the sudden overloads caused by generator or engine failure. That means can be a quick load-reduction system or a specified procedure that reduces the total load to a quantity within the rated capacity of the remaining operable generators. More generally, loads must be connected to power sources so that the rated limits of the source are not exceeded unless effective monitoring keeps the load within prescribed limits.

STUDY TIP

Think through the failure case: with one generator lost, the remaining capacity is what counts, so the answer is always load shedding.

KEY POINTS

  • Paralleled generators are rated at their combined output.
  • Losing one generator can suddenly overload the rest.
  • A quick load-reduction system or procedure must be provided.

SOURCES

  • amp-powerplant/ch04.txt "Controlling or Monitoring the Electrical Load"
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MORE ON ENGINE ELECTRICAL SYSTEMS

SkyDrill is not affiliated with the FAA. This is an original practice item based on FAA-H-8083-32B Aviation Maintenance Technician Handbook – Powerplant, and 14 CFR part 43. Regulations and handbooks are revised; confirm details against the current edition.