Starter/Generator - Generator System - THRUSH S2R – G10 Maintenance Manual

AIRCRAFT MAINTENANCE MANUAL

STARTER/GENERATOR - GENERATOR SYSTEM

TROUBLE
Zero or low voltage
indicated
No generator output
Volt-ammeter does not
indicate
Starter inoperative
10-8
Page
THRUSH AIRCRAFT, INC - MODEL S2R-G10
PROBABLE CAUSE
Loose connection
Open or shorted field circuit in
generator or defective
armature
Brushes not contacting
commutator
Brushes worn
Dirty commutator
Defective voltage regulator
circuit
Generator circuit breaker
tripped or 130 amp buss limit
fuse blown
Improper connections
Defective generator controls
switch Continuity.
Defective Reverse Current
Relay
Defective generator
Defective wiring
Defective meter
Circuit breaker tripped
Low battery
Starter relay inoperative
REMARKS
Check connections throughout
system
Test resistance of field. Check
field circuit connections.
Replace starter-generator if
defective.
Clean brushes and holders
with a clean, dry, lint-free cloth.
Replace weak springs.
Replace brushes
Clean commutator
Adjust or replace regulator
Check for short circuit and
reset circuit breaker and / or
replace buss limit fuse
Check connections against
wiring diagram
Check switch for proper
operation and replace if
necessary.
With engine running, check for
27.5vdc at both GEN and
BATT terminals. If 27.5vdc at
GEN and 24vdc at BATT,
reverse current relay is faulty.
Check generator with an
ohmmeter and replace starter-
generator if necessary
Continuity. Check wiring and
repair as necessary
Replace meter
Check for short circuit and
reset circuit breaker
Check battery. Service and
recharge as necessary
Check relay for operation and
replace if necessary
Effective: 03/26/2010