Planet ES-10024B-1 Maintenance Manual page 37

Aircraft Alternator
Maintenance Manual
3.2 Continued
Damaged alternator or voltage regulator wiring harness: Check wiring harness for damage and repair. If
damage is found, check voltage regulator for function and replace if necessary.
Dirty or rough rotor slip rings: If dirty, the slip rings may be cleaned. Take care not to scratch the surface. If
the slip rings are worn beyond limits, replace or overhaul alternator (see section 6).
Partially shorted rectifier: Perform the tests for rectifiers as found in section 6. Disassembly may be required
to verify symptom. Replace or overhaul alternator.
Insufficient output filtering: Check the RFI filter by performing a capacitance check. Replace RFI filter if
failed (external filter only). If an internal PCB type filter, replace or overhaul alternator if failed. In some cases,
additional RFI filters may be installed, be sure that a check is performed on each. If only one RFI filter is
installed, additional filters may be required to reduce noise.
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.
Loose electrical bus connections: Check aircraft electrical bus for loose wire connections. Tighten or repair as
required.
ES1031
Rev. A: 11 Aug. 2021
Table 3.6
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24-30-01
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