Cessna SKYMASTER 336 1964 Service Manual page 231

15-26. TROUBLE SHOOTING THE LIGHTING SYSTEM.
PROBABLE CAUSE
ISOLATION PROCEDURE
LANDING OR TAXI LIGHT OUT.
Circuit breaker open.
Lamp burned out.
Defective wiring.
Defective switch.
Defective circuit breaker.
Inspect.
Test with voltmeter or new
lamp.
Test circuit for continuity.
Check for continuity.
Test with voltmeter.
Reset.
Replace lamp.
Repair wiring.
Replace.
Replace.
ONE NAVIGATION LIGHT OUT.
Lamp burned out.
ALL NAVIGATION LIGHTS OUT.
Circuit breaker open.
Faulty switch.
Defective wiring between
circuit breaker and switch.
Test with new lamp.
Inspect.
Test for continuity.
Test for continuity.
ROTATING BEACON ROTATES BUT DOES NOT LIGHT.
Lamp burned out.
Test with new lamp.
Faulty light assembly.
Remove and test.
ROTATING BEACON LIGHTS BUT WILL NOT ROTATE.
Faulty motor or internal
Remove and test.
connections.
ROTATING BEACON DOES NOT LIGHT OR ROTATE.
Circuit breaker open.
Inspect.
Faulty switch or wiring.
Test for continuity.
Faulty circuit breaker.
Test with voltmeter.
Faulty rotating beacon.
Test voltage to beacon. Re-
move beacon and test internal
wiring.
Replace lamp.
Repair or replace.
Repair or replace.
Reset.
Replace or repair.
Replace.
Repair or replace.
Continued on next page.
15-8
REMEDY
Replace.
Reset.
Replace.
Repair.