Text in force at CS29-12: from CS29-0, effective 14 Nov 2003.
(a) Each detail of each control system must be designed to prevent j amming, chafing, and interference from cargo, passengers, loose objects, or the freezing of moisture.
(b) There must be means in the cockpit to prevent the entry of foreign objects into places where they would jam the system.
(c) There must be means to prevent the slapping of cables or tubes against other parts.
(d) Cable systems must be designed as follows:
(1) Cables, cable fittings, turnbuckles, splices, and pulleys must be of an acceptable kind.
(2) The design of cable sy stems m ust prevent any hazardous change in cable tension throughout the range of travel under any operating conditions and temperature variations.
(3) No cable sm aller than 3.2 mm (1/8 inch) diam eter m ay be used in any primary control system.
(4) Pulley kinds and sizes m ust correspond to the cables with which they are used.
(5) Pulleys must have close fitting guards to prevent the cables from being displaced or fouled.
(6) Pulleys must lie close enough to the plane passing through the cable to prevent the cable from rubbing against the pulley flange.
(7) No fairlead m ay cause a change in cable direction of more than 3°.
(8) No clevis pin subj ect to load or motion and retained only by cotter pins m ay be used in the control system.
(9) Turnbuckles attached to parts having angular m otion m ust be installed to prevent binding throughout the range of travel.
(10) There must be m eans for visual inspection at each fairlead, pulley , terminal, and turnbuckle.
(e) Control system j oints subj ect to angular motion must incorporate the following special factors with respect to the ultim ate bearing strength of the softest material used as a bearing:
(1) 3.33 for push-pull sy stems other than ball and roller bearing systems.
(2) 2.0 for cable systems.
(f) For control s ystem joints , the manufacturer’s static, non-Brinell rating of ball and roller bearings may not be exceeded.
ED Decision 2003/016/RM · Source