Maintenance Manual LS8-st
Instructions
Edition: June 2016
Rev. 6 TN 8024
4-11
4.5 Installation of Control Surfaces
(continued)
Disassembly of Rudder
(1) disconnect rudder cables.
Attention:
Don’t loose spacing casings.
Attention:
Rudder cables may be drilled. If this is changed
unintentionally, neutral positions of rudder and pedals do no longer
correspond and must be realigned as detailed below.
(2) loosen nut at lower bearing (6mm thread, M6 LN 9348 or DIN 985-8zn,
width over flats 10mm) using a socket wrench, remember sequence and
position of washers.
(3) lift rudder upward from bearings.
Assembly of Rudder
(1) grease bearings according to lubrication schedule, see section 3.3.
(2) If need be, install new V-type internal seal, see section 4.6.
(3) lower rudder into bearings, do not use force !
(4) check radial play of upper bearing: maximum permissible radial play 0.5
mm <0.02 in>. If necessary renew brass bushing. Make sure, that non-
concentric position of bearing keeps relative position to direction of flight.
Bond bushing with for instance Loctite 72 b (672).
(5) connect rudder cables provisionally, do not forget to insert spacing casings
into thimbles.
(6) check rudder pedal alignment: with pedals in neutral position check if
rudder is neutral.
If rudder is deflected to one side, twist
opposite
cable
counter-clockwise
(
maximum 5 turns
) until properly aligned.
Should more than 5 turns be necessary for alignment, exchange cables.
Caution:
Never turn cables
clockwise
!
(7) place washers on cable connection bolts and tighten nuts M6 LN 9348 or
DIN 985-8zn, width over flats 10 mm, with maximum torque 6.4 Nm
(0.65 mkg, 4.623 ft lbs).
(8) set up washers at lower bearing as found during disassembly (normally:
recessed washer first, then large washer). Tighten nut (6 mm thread, LN
9348 or DIN 985-8zn, width over flats 10 mm) with maximum torque 6.4
Nm, (0.64 mkg, 4.623 ft lbs). After assembly the rudder should have
audible axial play, maximum axial play 1 mm (0.04 in), see section 1.5.
(9) if necessary, restore gap seals (convex plastic strip) on both sides, see
section 4.6.