Fault Isolation (Starter Generator) - Piper Cheyenne IIIA Airplane Maintenance Manual

PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
A. DC Generation (continued)
2. Fault Isolation
CHART 1
FAULT ISOLATION (STARTER - GENERATOR) (Sheet 3 of 3)
Fault
Cause Remedy
D to E paralleling voltage
not within limits.
Insufficient cooling air.
Check for air inlet
temperature.
Air flow obstruction; dirt
accumulation in generator
ducting.
Wrong load applied during
testing.
Check ducting and generator
air inlet.
Check testing procedure
and correct condition.
Starter generator fails
starting test.
Short circuited or open
stator winding.
Replace stator and housing
assembly.
Open circuit in armature.
Replace armature.
Figure 1
EFFECTIVITY:
040-999
PAGE 4 24-30-00
Jan 10/90