Alignment Of Main Landing Gear; Removal Of Main Gear Door Assembly - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTON SERVICE MANUAL
CAUTION
When installing the fork bolt in the actuator rod end be sure that the
forked end is properly aligned with the downlock operating rod or
cable. Install the anti-rotation clip. (See Sketch B of Figure 7-9.)
m.
Extend gear and as side braces approach the locked position, apply a side force to the wheel so
that the hydraulic actuator must force the linkage into the locked position.
n.
Adjust the stroke control stop (59) on the lower end of the actuator to stop the piston travel at
this point. Repeat several times to determine that the stroke control is properly adjusted.
o.
Back off the stroke stop one-half turn and tighten locknut on stop. Place the key locks (70)
between the locknut (60 or 61) and the keyway in the rod. Screw the locknut on the rod and keep the key
lock centered in the keyway while tightening the locknut. With the locknut torqued, install the lock wire
from the key lock (70) to the locknut. Refer toFigure 7-10 which shows the proper installation of the locks
and locknuts on the piston rod end.
CAUTION
Be sure that all rod ends have sufficient gripping thread by
determining that a wire will not go through the check hole in the
rod.
7-26. ALIGNMENT OF MAIN LANDING GEAR.
a.
Place a straightedge no less than fifteen feet long across the front of both main landing gear
wheels. Butt the straightedge against the tires at the hub level of the landing gear. Ascertain that the
straightedge is the same distance from the forward side of the axle hubs. Devise a support to hold the
straightedge in position.
b.
Place a spacer block against the wheel rim at the hub line, with the wide end toward the front of
the wheel to check and/or adjust the landing gear for proper toe-in of .5 degree. (Refer to Figure7-1 L) Set a
square against the straightedge and spacer block and check to see if its outstanding leg bears against the
spacer block. (A spacer block may be fabricated according to Figure 7-37.)
NOTE
A carpenter's square, because of its especially long legs, is
recommended for checking main landing gear wheel alignment.
c.
If a gap appears at the rear, between the block and square, the wheel is toed-out and must be
realigned. If a gap appears at the forward end between the block and square, the wheel has too much toe-in
and must be realigned to get .5 degree toe-in.
d.
To rectify toe-in or toe-out condition, remove bolt connecting upper and lower torque links and
remove or add spacer washers to move the wheel in desired direction.
e.
Recheck the wheel alignment. If the wheel alignment is correct, safety the castellated nut with a
cotter pin. If the misalignment still exists, separate the torque links and add or remove a spacer washer.
Limit the number of spacers installed to allow for installation of the cotter pin in the bolt.
7-27. REMOVAL OF MAIN GEAR DOOR ASSEMBLY.
a.
To remove the outboard gear door, disconnect the retraction rods from the door and remove the
hinge bolts.
b.
To remove the inboard gear door, place the airplane on jacks and retract the gear enough to allow
the door to open. Disconnect the actuating cylinder rod and remove hinge bolts.
Revised: 3/5/84
LANDING GEAR AND BRAKE SYSTEM
2E18