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PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
A. Aileron and Tab (continued)
15. Removal of Aileron Trim (Wing) (Figure 401)
(a) Remove access plates located under bottom trailing edge of wing at Stations 92.5,117.5,
128.0,151.5,171.0, and 176.0.
(b) Disconnect trim control link located between trim screw and tab push-pull tube.
(c) Block both sets of trim cables to prevent unwrapping from their drums and ease removal.
Block fuselage cable system at pedestal drum and wing system at tab screw assembly Wing
Station 171.0.
(d) Mark one set of cable ends at Wing Station 90.0 to facilitate installation and disconnect cables
at tumbuckles.
NOTE: Note specific routing and hookup of each cable to ensure proper operation after
installation.
(e) Remove fairleads in rib at Station 121.5 by reaching through access openings at Wing Stations
117.5 and 128.0.
(f) Through access opening at Wing Station 150.0, remove appropriate guide pin.
(g) With screw drum disconnect from tab link assembly, remove bolts securing drum assembly to
rear spar.
(h) Carefully pull screw drum assembly and cables from wing.
16. Installation of Aileron Trim (Wing) (Figure 401)
(a) Ensure appropriate cable assembly is centered and evenly wrapped on drum (see paragraph
titled Wrapping of Trim Drums). Center drum between stops on trim screw and block cables to
prevent unwrapping.
(b) Feed cables back through wing so screw drum is fed up into wing as cable slack becomes less.
(c) Position screw drum assembly inside wing, install attachment bolts, and torque.
(d) Finish drawing cables through wing. Connect to appropriate tumbuckles at Wing Station 90.0.
If fuselage cable system is not installed, block cables at rib Wing Station 121.5 by reaching
through access opening at Station 117.5.
(e) With cables retained, remove cable blocks.
(f) Connect trim link to screw drum shaft.
(g) Install cable guard pin at Wing Station 150.0.
(h) Install snap bushings at Station 121.5
(i) If both fuselage and wing cable system are installed and engaged, set cable tension with
turnbuckles at Wing Station 90 (Figure 502). Check rigging and adjustment.
(j) Install all access plates.
17. Rigging of Aileron Controls (Figures 401,402, 501 through 504))
NOTE: The following procedure assumes system to be far enough in rig to allow all rigging
pins to fit in their individual holes at same time.
(a) Remove access plate to each aileron bellcrank at Wing Station 178.
(b) Position bellcranks in neutral positions using rigging pins. (AN-3-20 bolts with ribbons
attached.) Figure 503)
(c) Remove access plates under pilot seat and insert rigging pin through the sectors. If pins will
not line up in both bellcranks and sectors under pilot seat, proceed as follows:
(1.) Align sectors and install rigging pin.
(2.) Clamp cables near sectors to prevent any load on rigging pin.
(3.) Adjust cables with tumbuckles at Fuselage Station 142 until both aileron bellcrank
pinholes align.
(4.) Insert rigging pins and unclamp cables.
(d) Install rigging pins in bottom of pilot control column. Adjust pushrod to sector if necessary.
Adjust length of vertical pushrod in column as follows (refer to Figure 501).
EFFECTIVITY:
PAGE
12
040-999
Jan
10/90 27-10-00
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