Aircraft Alternator
Maintenance Manual
24-30-01
ES1031
Page: 3-6 Rev.
B: 20 Apr. 2022
© 2022 - Hartzell Engine Technologies - All rights reserved
3.2 Continued
Table 3.5
Brush arcing:
Remove and examine brush material, spring, and leads. If spring in broken or the lead is coming
out of brush, or if brush is chipped or worn past 50% replace brush. Examine slip ring surface for condition.
Rough or damaged slip ring surface:
If the slip rings show minor surface roughness they may be polished. If
the slip rings are worn or damaged beyond limits, replace or overhaul alternator (see section 6).
Loose field or aux terminal connections:
Check terminal connections for damage. Provide adequate strain
relief to the wiring and tighten terminals properly.
Loose ground or battery connections:
Check ground and battery connections for damage. Provide adequate
strain relief to the cables and tighten properly. (See engine or aircraft service manuals.)
Resistive or arcing circuit breaker:
Make a resistance check of the circuit breaker, essentially, there should be
no resistance. Check breaker function. Old circuit breakers should be replaced.
Failed voltage regulator or connector:
Check to see if the regulator connector is attached properly. Remove
and examine connector. Look for arcing or overheating. Check wiring harness and replace the voltage regulator
if failed.
Dirty or oxidized regulator contacts:
Inspect both the male and female connector contacts. Clean using an
aviation quality contact cleaner. For circuit board edge contacts, first us a pencil eraser on the edge followed by
contact spray cleaner.
Loose connections in charging system or damaged wiring harness:
Inspect the terminals, if they will tighten,
do so. Also observe the wire terminal ends to assure they are crimped properly on the wire and no corrosion or
burns are present. Check harness from end to end and repair any damaged wiring.
