64-02-02 BOEING: Amdt 673 Part 507 Federal Register January 17, 1964. Applies to All Models 707 and 720 Series Aircraft With Boosted Rudder and Extended Vertical Fin Configuration.\n \n\tCompliance required within the next 100 hours' time in service after the effective date of this AD, unless already accomplished. \n\n\tTo eliminate a possible hazard to operational safety during autopilot coupled approaches accomplish either (1) or (2) of the following or an equivalent approved by the Chief, Engineering and Manufacturing Branch, FAA Western Region: \n\n\t(1)\tEliminate autopilot rudder crossfeed by the following circuit modification. In the RJ3 junction box disconnect wire C144A22 from terminal E18 and connect to terminal E17. In the autopilot adapter unit, Boeing P/N 10-3056-2 or Eclipse-Pioneer P/N 15236-2A1 loosen the locking nut and turn shaft of R5 potentiometer to zero setting. Conduct a continuity check between pins D and E. A reading which indicates 5 ohms or less must be obtained.\n \n\t(Boeing Service Bulletin 1797 covers this same subject.) \n\n\t(2)\tLimit rudder crossfeed by the following circuit modification. Insert a 5600 ohm, one half watt 5 percent resistor sleeved in No. 4 plastic tubing in the circuit from terminal E18 of junction box RJ3 to terminal (E) of connector RD921 by connecting one end of the resistor to terminal E18 and the other end to a new standoff terminal and moving wires C144B22 from terminal E18 to the new standoff terminal. Insert two Transitron No. SG22 diodes paralleled in opposite polarity and sleeved in No. 11 plastic tubing between terminals E17 and E18 of junction box RJ3. In the autopilot adapter unit, Boeing P/N 10-3056-2 or Eclipse-Pioneer P/N 15236-2A1 loosen the locking nut and turn shaft of R5 potentiometer to a setting of 10. \n\n\t(Boeing Figure 1, CDP-150, page 3, revised September 9, 1963, covers this same subject.) \n\n\tThis supersedes AD 63-05-01. \n\n\tThis directive effective January 17, 1964.