D/N RMI Heading Card Calibration on a Model 242

The pilot’s D/N RMI heading card is normally slaved to the copilot’s HSI heading card.  The copilot’s D/N RMI heading card is normally slaved to the pilot’s HSI heading card (if installed).  Make sure that the HSI heading cards are calibrated prior to calibrating the (slaved) D/N RMI heading card.

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HSI Heading Card Calibration on a Model 242

Adjustment of the HSI heading card is performed on the Servo Boards.  The pilot’s HSI heading card is adjusted on Servo Board #1; the copilot’s HSI heading card is adjusted on Servo Board #2.  The card should indicate accurately to within 3 degrees of aircraft magnetic heading as indicated on the instructor’s station monitor.

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