(b)
Minimize air bubbles as much as possible by fairing the sealant.
NOTE: A solution of 15 to 20% isopropyl alcohol in
____ distilled water may be applied to the fairing tool to prevent the sealant from sticking to the tool. If the fairing is done by hand (finger) the sealing personnel must wear clean polyethylene gloves.
(c) Form a bead a minimum of 0.08 inch thick on the junction of the retainer nuts and the steering cylinder above the upper trunnion locknuts.
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747-400 MAINTENANCE MANUAL
S 434-029
(19)
Remove all caps and plugs and connect the hydraulic lines to the valve ports.
S 434-030
(20)
If you removed the input arm, attach the metering valve input arm to the valve. Tighten the nut to 65 +/- 5 pound inches.
S 424-080
CAUTION: MAKE SURE THE INPUT ARM AND THE METERING VALVE INPUT SHAFT
_______ SPLINE ARE ALIGNED SUCH THAT THE NULL POSTIONS IS OBTAINED.
(21)
Attach the connection rod to the metering valve input arm.
S 834-031
(22)
Make sure that the rigging pins can be inserted in the metering valve crank and the summing lever mechanism without binding.
(a)
Readjust the connecting rod length if it is necessary.
S 094-032
(23)
Remove the rigging pins from the summing lever mechanism and from the metering valve crank.
H.
Test the steering metering valve.
S 014-033
(1) Disconnect the nose gear torsion links at apex (AMM 32-21-03/201).
S 864-034
CAUTION: FAILURE TO OPEN THE CIRCUIT BREAKERS BEFORE PERFORMING THE
_______ FOLLOWING PROCEDURES CAN RESULT IN DAMAGE TO THE EQUIPMENT OR EXCESSIVE EQUIPMENT OPERATING TIME.
(2)
Open the body gear steering system circuit breakers as follows:
(a)
P7 Overhead Circuit Breaker Panel
1) 7G23 BODY GR STRG ARM AC
2) 7G24 BODY GR STRG ARM DC
S 494-058
WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE DOOR LOCKS ON THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(3) Do this task: "Installation of the Door Locks on the Nose Landing Gear" (AMM 32-00-30/201).
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S 864-059
(4) Supply system no./1 hydraulic power (AMM 29-11-00/201).
S 874-036
(5) Bleed the nose gear steering hydraulic system. (a) Operate the nose gear thru 5 full cycles.
S 714-037
(6) Turn the captain's tiller from the neutral position to the left (counterclockwise) until the tiller stop is touched and then hold. (a) Make sure that the nose gear steering collar rotation from neutral is 70 (+2/-3) degrees. (b) Release the captain's tiller and allow it to return to neutral without manual assistance.
1) 2) Make sure that the captain's tiller goes back to the neutral position.Make sure that the nose gear goes back to the neutral position within |2.0 degrees.
S 714-038
(7) Repeat the steps above but turn the captain's tiller from neutral to the right (clockwise) and test for the same results.
S 714-039
(8) Turn the captain's tiller by hand as rapidly as possible to the left (counterclockwise) from the neutral position until the nose gear is fully rotated. (a) Make sure that the full rotation time is 9 seconds or less with no chatter or erratic system response.
S 714-040
(9) Do the step above again but turn ehe captain's tiller to the right (clockwise) and test for same results.
S 794-041
(10)
Examine for leakage at the metering valve.
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