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PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
A. Aileron and Tab (continued)
7. Removal of Control Column Sprockets
(a) Remove access panels located on forward side of control column approximately 6.00 inches
below control wheels on pilot and copilot control columns.
(b) Remove cover assembly from top of both control columns.
(c) Install rigging pins in lower portion of pilot control column ensuring bellcrank is captured
between two pins.
(d) Insert two pieces of 0.032 inch safety wire down copilot control column and one piece down
pilot control column. Wrap one end of each wire to a link in chain below turnbuckles. Tie
opposite ends of wires to holes which forward access panels are mounted to columns.
NOTE: Keep the wires tight so chain does not fall off sprockets under floorboards.
8. Installation of Control Column Sprockets
(a) Place alignment mark on new sprocket in same place as old sprocket.
(b) Mount new sprocket on shaft with sprocket hub facing away from control wheel. Line ream
hole in sprocket and shaft assembly to 0.1635 - 0.1640 inch diameter. Install Hy-Lok HL 18-5-
16 pin in hole for drive fit. Install Hy-Lok HL-70-5 collar on pin and tighten it until hex position
shears off. Hold pin head with an Allen wrench if necessary.
(c) Reassembly control wheel assemblies into control columns by securing bearing blocks to each
column with ten AN3-3A bolts previously removed.
(d) Install chains on sprockets so previously installed ty-raps align with sprocket alignment marks.
(e) Reconnect turnbuckles ensuring proper placement. Remove safety wire used to retain chains.
Level pilot control wheel by adjusting turnbuckles A and B and taking up slack with turnbuckle
C (Figure 402). Level copilot control wheel by adjusting turnbuckles B and C. Tension chain
enough to remove slack, but not enough to increase friction. Through access hole in copilot
column, deflect chain with finger applying approximately 5 pounds of pressure. Deflection must
be between 1/4 - 1/2 inch.
(f) Remove rigging pins and ty-raps. Check aileron system friction per 27-10-00 page ??. Move
controls through full travel range and check for free movement.
(g) Install turnbuckle safety pins and access covers.
9. Removal of Aileron Control Section (Figure 401)
(a) Disconnect cables and aileron control pushrod from sector.
NOTE: Both aileron and elevator sectors are located at Station 93.3. Though not integrally
connected, a hinge bolt maintains their axial position. If is necessary, therefore, to
remove aileron cables from their sector and loosen elevator cables so hinge bolt can
be pulled out. The forward elevator sector will not be unhinged due to removal of
aileron sector.
(b) Remove AN6-60A pivot bolt.
(c) Rotate sector so grooves are facing fore and aft. Slide sector to left of aircraft and out from
between bracket supports.
EFFECTIVITY:
040-999
PAGE
9
Jan
10/90
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