Installation Of Forward Rudder Trim System - Piper Cheyenne IIIA Airplane Maintenance Manual

PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
A. Rudder and Tab (continued)
12. Installation of Forward Rudder Trim System (Figure 401)
(a) Ensure cable is centered and evenly wrapped on trim drum (see paragraph on Wrapping of
Trim Drums). Block cables to prevent drum from unwrapping.
(b) Lay trim drum on floor in front of pedestal and attach leader lines to proper cables.
(c) From rear of cabin, carefully pull cables through fuselage ensuring cables are aligned on
pulleys.
(d) Install cable guide pins and rub blocks.
(e) Install drive shaft from control and mount the drum assembly on channel plate.
(f) Follow cable back down fuselage and align in pulley and rub blocks.
(g) If aft trim system is not installed, pull cables tight and block them on aft side of F.S. 310.0
bulkhead.
(h) If aft trim system is installed, engage cables with proper turnbuckles and rig and tighten cables
to specifications in Figure 501.
(i) Conduct a final check of all cable routing, pulleys, and rub blocks.
(j) Install all access plates, carpeting, and seats.
13. Removal of Aft Rudder Trim System (Figure 401)
(a) Remove right side floor panels between bulkheads F.S. 310.0 to 332.0, two access plates on
right side of tail and tail cone (stinger).
(b) Block aft trim cables (using one method in 27-00-00, Figure 2) on front side of bulkhead F.S.
332.0 to prevent unwrapping from screw drum assembly on aft canted bulkhead.
(c) Block forward cables to rear of F.S. 310.0 bulkhead.
(d) Mark one set of turnbuckle cable ends and remove fairleads in pressure bulkhead F.S. 332.0.
(e) Disconnect cables at turnbuckles and attach 10 foot leader line to two cable terminal ends.
(f) At pulleys on bottom of pressure bulkhead and on aft canted bulkhead, remove cable guide
pins and block cables on aft screw drum.
(g) Remove cable blocks at F.S. 332.0 and bolts retaining screw drum to canted bulkhead.
Carefully remove drum.
(h) Carefully pull cables out tail and disconnect leader lines, noting which lines are attached to
which cables, respective to trim drum in its mounted position.
14. Installation of Aft Rudder Trim System (Figure 401)
(a) Ensure appropriate cable is centered, evenly wrapped on drum (explained on paragraph
entitled Wrapping of Trim Drums), and blocked to prevent unraveling.
(b) Position screw drum assembly on canted bulkhead. Mount with two bolts and required
washers.
(c) Attach cable terminal ends to leader lines and from inside cockpit at F.S. 313.0. Carefully and
slowly pull cables through fuselage. Remove leader lines from cables when cables are in
fuselage.
(d) Ensure cables are properly centered on pulleys.
(e) Attache cable to proper turnbuckles. Tighten and rig system to specifications in Figure 501.
EFFECTIVITY:
27-20-00
Jan 10/90