Publicité
Les langues disponibles
Les langues disponibles
78. Remove the covering from the retract well on the bottom
of the wing using a hobby knife with a #11 blade. Use a
covering iron to seal the covering around the opening.
79. Route the brake lead and control lead from the retract into
the wing.
80. Retrieve the leads from the same location as the flap and
aileron leads. Make sure to label the leads so they can be
identified when assembling the model for flight.
81. Prepare the retract mounting screws by sliding a 4mm lock
washer, then a 4mm washer on the M4 x 20 socket head cap
screws. Prepare all four mounting four screws.
82. Secure the retract in the wing using the four screws prepared
in the previous step and a 3mm hex wrench.
Î Use threadlock on the screws to prevent
them from vibrating loose.
Î It may be necessary to use thin spacers under the
retract frame to make sure there is no torsional stress
when tightened into position. Torsional stress can
cause intermittent operation of the retract unit.
Aermacchi MB-339
83. Check the operation of the retract using the retract module.
A test button is located on the module, or the module can be
connected to the receiver to check both the retract operation
and the operation of the brake.
NOSE GEAR RETRACT INSTALLATION
84. Remove the canopy from the forward fuselage. Set the
canopy aside in a safe location.
85. Mount the steering servo in the retract servo opening using
four M3 x 12 button head screws. Apply a drop of threadlock
on each screw, then tighten the screws using a 2mm hex
wrench.
Î Some servos may require the orientation to be
reversed to avoid contacting the retract unit. To
do so may require a different length pushrod.
86. Assemble the steering linkage and attach it to the servo arm
using an M3 x 15 button head screw, M3 washer and M3 lock
nut. Use a 2mm hex wrench and 5.5mm nut driver.
87. Snap the ball on the steering arm of the retract. Center the
steering servo and adjust the length of the linkage to center
the nose gear.
Î Make sure to adjust the servo travel so equal
defection is achieved in each direction. Also make
sure the servo is not over traveling as this may
damage the ball attached to the nose leg.
13
EN
Publicité
