Service difficulty reports (SDR)Components 17 January – 25 March 2014 By staff writers - May 2, 2014 2331 Distributor cracked. SDR 510018733 Magneto distributor block cracked. Suspect due to over torquing. Investigation also found timing out of limits. Kelly Aerospace 103492901R housing incorrect part. SDR 510018732 Magneto had incorrect housing fitted.