Boeing F4B-1 - Fuselage

7. ALIGNMENT: a. See that the fuselage is level longitudinally and later-
ally. Place a level along the rear stabilizer beam and a level or plumb-bob on
the rear fin beam. Bring both into alignment by adjusting the brace wires and
struts. Do not tighten the brace wires more than necessary and be careful not
to distort either the fin or stabilizer.
b. If necessary, the stabilizer struts may be adjusted by disconnecting the
lower end, loosening the locknut, and screwing the terminal to the desired position.
Do not tighten the locknut any more than is necessary to preserve the adjustment
when the strut is removed.
c. The stabilizer may be set to any desired position from +2° to -4° by
turning the crank on the right hand side of the cockpit. The range of motion is
determined by the setting of the nuts on the stabilizer screw (A, Fig. 6). The
markings on the fuselage near the stabilizer leading edge indicate the limits of
motion and these limits should not be exceeded. If for any reason the marks have
been removed, they may be located as follows:
Level the fuselage. Place a block¾ inch high on the center of the rear stabilizer
beam 3-i\ inch outboard from the inner hinge and, directly forward of this, place
another block H- inch high on the front beam. Be sure the blocks do not rest on
rivets and are placed between the corrugations. Now place a level across the
blocks and adjust the stabilizer until horizontal. This is the zero setting. The
+2° setting will be 1.22 inch above this and the -4° setting 2.44 inch below.
d. Note that fairing socks are to be installed on the lower ends of the stabilizer
struts.
FIG. 6-STABILIZER ADJUSTMENT
8. MAINTENANCE: At regular intervals inspect all cotter pins, lockwire,
locknuts and all moving parts of the whole tail assembly. Clean and paint wherever
required. Drain holes must be kept open.
9. LUBRICATION: Lubricate the following points at least twice a week
on airplanes in regular service:
a. Rudder hinges ..
b. Elevator hinges ..
c. Stabilizer bearing.
SECTION IV
FUSELAGE
Paragraph
10. Line-up
11. Testing Alignment
12. Maintenance . .. .. .
13. Repairs . ... .. .................... .
10
.. ... Oil
. .. ... ... .. . ... .... .. Oil
. ... . Oil
Pag·e
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