TM 55-1520-240-T
CHAPTER 13
ENVIRONMENTAL CONTROL SYSTEM TROUBLESHOOTING
CHAPTER OVERVIEW
Chapter 13 contains procedures for Environmental Control System Troubleshooting. Each environmental control system failure symptom is listed below. Included
in this Chapter are locations and views of all electrical connectors, receptacles, relays, and ground connections for the Environmental Control System. Refer to
TM 55-1520-240-23 for required Environmental Control System maintenance procedures.
SYSTEM
PARA
HEATING AND VENTILATION
13-1
FAILURE SYMPTOM LIST
HEATING AND VENTILATION
SYMPTOM
TASK
AIR FLOW NOT FELT AT CABIN VENTS
13-1.4
AIR FLOW NOT FELT AT JETTISONABLE DOOR DEFROSTER
DUCTS OR NOSE BUBBLE VENTS
13-1.4
AIR FLOW NOT FELT AT PILOT OR COPILOT AIR OUTLET
13-1.4
CABIN HEATER BLOWER CIRCUIT BREAKER WILL NOT
STAY CLOSED
13-1.4
CABIN HEATER CONT CIRCUIT BREAKER WILL NOT STAY
CLOSED
13-1.4
SYMPTOM
TASK
HEATER DOES NOT PROVIDE WARM AIR
13-1.4
HEATER FAN CANNOT BE HEARD RUNNING
13-1.4
HEATER FAN CANNOT BE HEARD RUNNING AFTER HEATER
START SWITCH PRESSED AND RELEASED
13-1.4
HEATER FAN STOPS RUNNING IMMEDIATELY AFTER
HEATER FAN SWITCH SET TO OFF
13-1.4
HEATER HOT (WITHOUT 74) HTR HOT (WITH 74) LIGHT
COMES ON
13-1.4
SYSTEM DOES NOT RESPOND TO CHANGES IN CABIN
TEMP SELECTOR SETTING
13-1.4
Change 23 13-2.1
