How does the instrument handle a probe failure? Will it give erroneous indications?
The Graphic Engine Monitor continuously checks for faults in the entire measurement system and will instantly detect a faulty or marginal temperature probe or lead wire. Should a CHT probe fail, the black bar will disappear from the display and the EGT column will remain unaffected. When an EGT probe fails, the corresponding EGT column will read full scale and then go blank. The CHT display will revert to a bright bar and remain fully functional. The failure of one probe will not affect the readings from the other cylinders. However, the failure of any EGT probe will affect Lean Mode and reliable leaning indications will be unlikely.
