Figure 3-30.—Aircraft leveling.
CAUTION
Leveling Aircraft
Use extreme care to raise wing jacks in
coordinated, small, equal amounts. Reload
on the tiedown chain is too high when
tensioning grip cannot be rotated manually.
Screw the leek collar down as each jack is being
extended. Jack the aircraft until its wheels clear the deck,
and set the lock collar handtight. Set each tiedown chain
to preload by manually rotating and tightening
tensioning grip.
An aircraft leveling technique is shown in figure
3-30. Jack aircraft at wing and nose jack point as
described earlier. Attach plumb bob and string to eye
bolt at FS 259 (fuselage station). Position the plumb bob
directly over the leveling plate on floor of aircraft. Level
aircraft laterally (left to right) by adjusting wing jacks
until plumb bob tip is directly above the center line in
the leveling plate. Level the aircraft longitudinaly
(forward and aft) by adjusting the nose jack until plumb
bob tip is directly above FS 259 line on the leveling
3-43
