Course knobs adjustment
RESTRICTED
J. Course
Knobs
Fig. 31
рд. 64
ADDITIONAL
MAINTENANCE
A.
Changes In
Order to
Render A.E.S.
Inoperative.
C. L.I.
B-43-20
See also
P. 177.
A.
Adjust backlash between turn
worm and Stab.
sector gear with
Always place
between worm housing and sight, than will be nect
essary to obtann
clearance; then remove . 001" at
a time to obtain
minimum clearance without bind-
The same
number of shims
should be placed
the course shaft bracket and the
case as there are
between the trun worm housing
and the sight case.
This will prevent warping and
binding of the course shaft. Turn the knob through
limits of Stab. sector each time sight is mounted.
This keeps wear even on stabilized sector gear.
Loosen set screw in drift worm
housing and
rotate housing
toward or away from drift gear to
obtain. 002" to .003" clearance.
Check by rotating
drift gear and
note movement of P.D.l. brush;
tighten set screw. Drag should be equal on each
knob.
Because of the
additional
maintenance requir-
ed, and the unfavorable
conditions
under which the
bombsight equipment must very often operate, it
is directed that
"service personnel" make the A.
E.S. inoperative
until the bombsight is
sent to
a depot for overhauling. When
the bombsight is
sent to a depot for overhauling, the A.E.S. will
be removed from the sight gyro,
and the
assembly
time be
re-balanced.
it is because
the static balance of the gyro would be seriously
effected, should the removal of the A.E.S.
be aff-
ected by
the "service personnel", that this order
directs the removal of the sight to the depot for
such a
purpose.
The A.E.S. will be secured or
locked in an in-
operative position as
follows:
Remove the red lead which connects the
auto-manual switch to the front contact of the ter-
minal block in the bombsight housing end cap.
Remove the small green lead which connects
the movable contact bracket to the A.E.S. relay
magnet assemhly.
Secure the inverted pendulum in
the ver-
tical by screwing in the
pendulum adjustable con-
tacts an
equal
amount until all motion of the pen-
is completely stopped.
shims.
more
shims
ing.
between
sight
B.
will
at
this
2.
3.
dulum
169