Piper Cheyenne IIIA Airplane Maintenance Manual page 201

PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
A. Heating and Cooling (continued)
1. Fault Isolation (Environmental Control System) (continued)
CHART 1
FAULT ISOLATION (ENVIRONMENTAL CONTROL SYSTEM) (Sheet 2 of 2)
Fault
Cause
Remedy
Check wiring.
Insufficient conditioned airflow. Bleed air ON/OFF valve
not full open.
Leaks in joints or connections.
Cooling turbine rotating
torque unsatisfactory.
(See Note.)
Heat exchanger leaking.
Malfunctioning Variable
Ejector Mixing Valve
Repair leaking joints and
connections.
Replace cooling turbine.
Replace heat exchanger.
Remove and replace valve.
NOTE: Refer to label on cooling turbine for maximum acceptable torque value.
EFFECTIVITY:
040-999
21-40-00
Jan 10/90