To add the optional flap servos, a reversing Y harness will be needed, or purchase 1 standard ST47 servo and 1 reversed ST47 servo. The required radio equipment to install the optional flaps would be as listed:
2 - JSP20050 SERVO, STANDARD, ST47
1 - EXRA320 Y HARNESS 6"/REVERSER STANDARD
1 - JSP20050 SERVO, STANDARD, ST47
1 - JSP20050R REVERSE SERVO JP20050 (ST47)
1 - JSP98020 Y-HARNESS, STANDARD 6"
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