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Symptom: *CMTC BUTTONS INOPERATIVE POSSIBLE CAUSES CMTC - BUTTONS STUCK ON CMTC - BUTTONS INOPERATIVE TEST ACTION APPLICABILITY 1 Using the DRBIII t in Compass/Mini Trip, Inputs/Outputs, read the Button state. Does the DRBIII t display either button pressed? All Yes → Replace the CMTC Push Button Module assembly in accordance No → 2 Using the DRBIII t in Compass/Mini Trip, Inputs/Outputs, read the Button state. While observing the DRB press the STEP button, then the US/M button. t display PRESSED after pressing each button? All No → Replace the CMTC Push Button Module assembly in accordance Yes → Test Complete. 92 OVERHEAD CONSOLE |