61-21-02 DOUGLAS: Amdt. 350 Part 507 Federal Register October 20, 1961. Applies to All DC-8 Aircraft. \n\n\tCompliance required within the next 10 hours' time in service. \n\n\tAs an interim safety measure pending development of modifications to the throttle control system and reversing mechanism the following procedures shall be followed: \n\n\tReverse thrust after landing shall not be used until: \n\n\t(a)\tThe main and nose gear of the aircraft are firmly on the ground, \n\n\t(b)\tthe blue ejector lights are on steady, \n\n\t(c)\tthe reverse power lever is positioned to reverse detent, and \n\n\t(d)\tthe amber reverser lights are on steady. \n\n\tIf the amber reverser lights are on steady, additional symmetrical reverse may be used on the inboard engines and thereafter reverse power may be used on the outboard engines if required. \n\n\tThis directive effective for all persons except those to whom it was made effective immediately by telegram dated October 6, 1961.