18
❏ ❏ 16. Connect the inboard pushrod to the other
end of the plywood lever. Use medium CA to glue
the horn to the inboard door. In the top-view photo,
note how the horn is slightly ahead of the lever so the
pushrods will not interfere when the door closes.
❏ ❏ 17. Temporarily disconnect the outboard pushrod
from the bellcrank lever. Retract the gear by hand
and close the door. With the door closed, lock the
pushrod to the screw-lock connector with a 4-40 x 1/8"
[3mm] SHCS.
❏ ❏ 18. Extend the gear and open the door by
hand. Reconnect the outboard pushrod and cycle
the gear with compressed air—both with the nacelle
upside-down and upright. Make sure both doors
open and close and that the retract locks in both the
retracted and extend positions. Make any necessary
adjustments as described below to get the gear and
doors operating correctly.
❏ 19. Mount and hook up the doors on the right
inboard wing panel the same way. Keep the left panel
nearby so it can be used as a reference.
❏ 20. Once you get both doors operating correctly
and reliably, snap a nylon retainer onto both screw-
lock connectors on the horns on the inboard doors.
Retract and Door Adjustments:
If the retracts don’t retract or extend all the way or
if the doors don’t fully close, following is a list of
possible problems and solutions:
❏ A. One or both pushrods may be too long.
Shorten the pushrods in small increments.
❏ B. One or both pushrods may be too short
not allowing the gear to retract fully. Lengthen
the pushrods.
❏ C. There may be too much or not enough
tension in the spring. Move the spring to a different
setting on the lever mount.
❏ D. There may be too much friction in the retract
unit, not allowing it to operate freely and all the
way. Lightly oil moving parts in the retract unit.
❏ E. Some of the parts in the door mechanism
may be binding. Isolate moving parts and fi nd
out if any are too tight (ball links on ball link balls,
clevises, screw-lock pushrod connector in inboard
door, screw holding in bellcrank lever.)
❏ F. The clevis on the inboard pushrod that is
connected to the lever may be interfering with the
inboard pushrod. Bend the inboard pushrod as
necessary to clear the clevis on the other side of
the lever.
❏ G. There may not be enough air pressure to fully
retract the gear—compressed air cans advertised
as “dusters” typically put out approximately 90-
100psi, but your can may be too low. 60-80psi
should be adequate for fully retracting the gear—
less for extending gear.
❏ H. You may be extending or retracting the gear
too slowly. A little momentum and a mild “slam”
will help the strut and doors extend and retract all
the way.
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