inch of the right 61-degree mark on the steering cap.
Repeat this process with the left rudder pedal.
11. Manually turn the nose gear left, and then right
to 0.3 inch beyond the 61-degree index mark on the
steering cap. With the steering switch actuated, the
system must be inoperative (beyond steering limits).
12. With the rudder pedals in the clean con-
figuration, move the nose gear left. Then move the nose
gear right to within 0.4 inch of the 61-degree limit, and
operate the steering switch. The gear should return to
13. Release the weight-on-wheels switch and
check to see that the nose gear steering disengages.
14. Release the steering switch, and disconnect
external electrical and hydraulic power.
15. Lower the aircraft and remove jacks.
16. Close access doors and check cockpit and nose
gear well for cleanliness and loose gear.
You can accomplish troubleshooting by studying
system diagrams and related troubleshooting analysis
charts. Malfunctions shown in the troubleshooting
tables are in numerical order. The numbers relate to
corresponding number(s) following the steps of the
operational check. If trouble symptoms are known, you
can accomplish troubleshooting without reference to the
operational check. However, following system repair,
perform an operational check to verify proper system
Bleeding the System
Bleed the system every time you replace a part or
disconnect a line. Clear the nose gear from the deck with
the hydraulic and electrical power connected. Depress
the nose gear steering switch and operate the rudder
pedals. As the nose gear steering cylinder moves, open
and close the extend and retract bleed ports. Do the same
with the relief valve bleed port at the steering cylinder
until the hydraulic fluid is free of air. Cycle the steering
system five complete cycles. Secure the bleed ports and
lockwire. Disconnect electrical and hydraulic power and
remove the jack.
Adjustment of Components
Connect external hydraulic and electrical power to
the aircraft before adjusting the steering cylinder or
amplifier. Jack the nose gear clear of the deck. Adjust
the steering cylinder in the following sequence:
1. Center nose gear.
2. Disconnect cylinder rod end from the steering
linkage bell crank.
3. Manually extend piston and position gauge set
on rod with gauge flush with rod end. Secure gauge to
rod end and push flush with cylinder housing.
4. Check to see that the piston rod end will connect
to the steering linkage bell crank with gear centered.
Adjust the rod end as required.
5. Remove gauge set and attach piston rod end to
steering linkage bell crank.
To adjust the steering amplifier, proceed as follows:
1. Insert rigging pin No. 1 in rudder pedal linkage,
and check to see that rudder is in neutral.
2. Operate the steering switch and check to see that
gear centers within 2 degrees of center index mark.
3. If gear does not center within limits, adjust the
steering amplifier potentiometer R7 so that the circuit
4. Remove rigging pin and check the area for
5. Remove the jack and external power.
NOTE: AE personnel normally accomplish the
MECHANICALLY CONTROLLED NOSE
STEERING SYSTEM MAINTENANCE
Maintenance of mechanically controlled nose
steering systems closely parallels the maintenance of
electrically controlled nose steering systems. Mechan-
ically controlled nose steering system maintenance
consists of the rigging and steering assembly mainte-
nance. See figure 12-16.
Rigging of the control linkages consists of several
steps. You must jack the nose of the aircraft and operate
the rudder pedals to deplete hydraulic pressure. Center
the recoil strut manually so that the link arm is in line
with the centers of the strut and the steering assembly.
Adjust all lower links to move freely overcenter, to make
sure that parts are free from binding, and then lock in
place with the stops. Install rigging pins in the rudder