(q)
Lubricate the threads of the nut, which attaches the bellcrank clevis bolt, with engine oil.
(r)
Install the washer and nut to the bellcrank clevis bolt.
(s)
Tighten the nut to a minimum of 15 pound-inches (1.695 newton-meters) plus the torque which is necessary to turn the nut on the bellcrank clevis bolt.
(t)
Continue to tighten the nut until the slot in the nut aligns with the hole in the bellcrank clevis bolt.
(u)
You must not have a torque more than 22 pound-inches (2.486 newton-meters) plus the torque necessary to turn the nut on the bellcrank clevis bolt.
(v)
Install and bend the cotter pin to the nut.
(w)
Lock the rod end bearing to the actuator rod with the jamnut.
1) Tighten the jamnut to 460-510 pound-inches (52.0-57.6
newton-meters).
CAUTION: MAKE SURE YOU REMOVE ALL OF THE RIG PINS FROM THE UNISON
_______ RINGS AND THE BELLCRANK. IF YOU DO NOT REMOVE THE ALL OF THE RIG PINS, YOU CAN CAUSE DAMAGE TO THE ENGINE.
(x) Remove the bellcrank rig pin.
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(y)
If an electrical switch box is used, push the actuation switch on the electrical switch box to retract and extend the actuator rod through its full movement. 1) Do this step a minimum of three times. 2) Stop the actuator rod in the fully extended position.
(z)
If the electrical switch box is not used, operate the actuator with the steps that follow: 1) Put the control handle of the hydraulic cart in the neutral
position. 2) Turn the valve handle for the air supply to the closed position. 3) Install a crowsfoot and a wrench on the flats of the bellcrank. 4) Push up on the wrench to move the system to the closed position.
NOTE: Move only enough to approximately align the
____ position slots on the bellcrank.
5) Remove the crowsfoot and the wrench. 6) Operate the hydraulic cart to supply 250-300 psi hydraulic pressure to the PF port.
NOTE: The stator vane actuator is fully extended against
____
the internal stop.
7) Do these steps one more time.
(aa) With the actuator rod extended fully (vanes open), install the bellcrank rig pin in the bellcrank arm slot and the two holes of the support.
(ab) If you cannot install the bellcrank rig pin, do the adjustment of the rod end bearing again.
(ac) If you can install the bellcrank rig pin, do the steps that
follow:
1) Lock the jamnut and the rod end bearing with the key
washer. 2) Bend one set of tabs on the rod end bearing. 3) Bend the other set of tabs on the rod end bearing. 4) Install the lockwire and seal.
CAUTION: MAKE SURE YOU REMOVE ALL OF THE RIG PINS FROM THE UNISON
_______ RINGS AND THE BELLCRANK. IF YOU DO NOT REMOVE ALL OF THE RIG PINS, YOU CAN CAUSE DAMAGE TO THE ENGINE.
(ad) Remove the bellcrank rig pin.
S 825-081-N00
(9) Do the adjustment of the unison rings:
(a) Use the hydraulic cart to supply 250-300 psi hydraulic pressure to the PF port to fully extend the actuator rod to the full open position.
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
CAUTION:_______ MAKE SURE YOU KEEP THE ACTUATOR ROD FULLY EXTENDED WHEN
YOU INSTALL THE BELLCRANK RIG PIN. IF YOU LET THE
ACTUATOR ROD RETRACT, YOU WILL NOT GET AN ACCURATE CHECK.
A BAD RIGGING CAN CAUSE A DANGEROUS STABILITY AND EFFECTS
ON THE LENGTH OF LIFE.
CAUTION:_______ MAKE SURE THE END OF THE RIG PINS ARE CORRECTLY AND FULLY
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本文链接地址：747-400 AMM 飞机维护手册 大气 AIR 2(26)
