C49. Ventilation blower draws excessive current.
Misaligned or preloaded bearings.
C50. Ventilation blower runs at reduced speed.
Brushes not seated properly
Switch set to low
C51. Ventilation blower draws excessive current and
runs at high speed.
Shorted turns in field windings.
C52. Ventilation blower draws excessive current and
Shorted turns in armature.
C53. Ventilation blower has excessive vibration.
Armature out of balance
Squirrel cage fan damaged
Squirrel cage fan out of balance
C54. Propeller deice inoperative.
Circuit breaker tripped.
Propeller deice switch defective.
Defective propeller deice timer