(d)
Remove the input control rods to the brake metering valve at the left and right metering valves.
(e)
Adjust two of the four brake bus input rods to a length of
10.41 |0.03 inch between the rod end centers.
(f)
Install the two rods that you have adjusted between the bus mechanism and the brake pedal mechanism cranks on the Captain's installation.
(g)
Insert rig pin LBG1 through the Captain's brake/rudder pedal housing and brake bellcranks.
(h)
Insert rig pin LGB2 through the First Officer's brake/rudder pedal housing and brake bellcranks.
(i)
Connect the First Officer's brake bus input rods to the brake pedal mechanism cranks and the brake bus cranks. Adjust the length of the rods, if necessary, so that the bolts can be installed easily.
S 825-020
(7)
Adjust the cables.
(a)
Install rig pins LGB3 and LGB4 through the metering valve quadrants and the support structure (Details A and B, Fig. 503).
(b)
If new cables have been installed, adjust the tension in the new cables as follows before you tighten the cables to the final tension.
CAUTION: WHEN YOU ADJUST THE CABLE PAIRS, NEVER ALLOW THE
_______ TENSION IN ONE CABLE OF THE CABLE PAIR TO EXCEED TENSION IN THE OTHER CABLE OF THE PAIR BY MORE THAN 50 POUNDS. TOO MUCH TENSION IN ONE CABLE MAY BEND THE RIG PINS.
1) Adjust the turnbuckles at the same time on the cable pairs that follow to obtain a tension of 190-210 pounds. Adjust the cable pairs in the sequence listed. a) LGB2A and LGB2B b) LGB4A and LGB4B
2) Remove rig pins LGB1, LGB2, LGB3 and LGB4.
3) Check the cable installation for the conditions that follow while you operate the brake pedals through 25 full cycles: a) The cables do not contact the pulley flanges for total
cable travel. The cable must lie within 2 degrees of the pulley. b) The cables are not deflected from the rigged or normal position by fairleads, rubstrips, or grommets. c) The pulleys rotate freely without cable guard interference.
32-41-00
ú ALL ú
ú ú ú 03A.101 ú Page 512Sep 28/02
A
757
MAINTENANCE MANUAL
d) The cables are installed through the grommets and the air pressure seals in the structure. e) The pushrods and levers do not rub against the structure. 4) Install rig pins LGB1, LGB2, LGB3 and LGB4.
CAUTION: WHEN YOU ADJUST THE CABLE PAIRS, NEVER ALLOW THE TENSION
_______ IN ONE CABLE OF THE CABLE PAIR TO EXCEED THE TENSION IN THE OTHER CABLE OF THE PAIR BY MORE THAN 50 POUNDS. TOO MUCH TENSION IN ONE CABLE MAY BEND THE RIG PINS.
(c) Adjust the cables to the tension shown in Table 1 as follows: 1) Adjust the cable pairs in this sequence:
-LGB2A and LBG2B
-LGB4A and LGB4B
2) Adjust the turnbuckles simultaneously on each cable pair. 3) Make sure that the rig pins LGB1 and LGB2 can be turned
easily in the rig pin holes. ~............................................................................. | TABLE 1 *[1] | ............................................................................... | BRAKE CABLE RIGGING LOADS | ............................................................................... | TEMP °F | LGB2A, LGB2B, LGB4A, LGB4B | | |5°F | TENSION IN POUNDS | ...............................................................................
| 140 | 123 |
| 120 | 115 |
| 100 | 107 |
| 70 | 95 |
| 50 | 87 |
| 30 | 80 |
| 10 | 72 |
| -6 | 66 |
2..........................…..................................................1
*[1] The cable tension values will not be valid when temperature differences greater than 5°F exist anywhere along the cable run. Aircraft/ambient temperatures should be stable for one hour before rigging.
(d)
Make sure that a maximum of 2 threads are exposed on the turnbuckles when rigging is complete.
(e)
Remove rig pins LGB1, LGB2, LGB3 and LGB4.
(f)
Operate the brake pedals through one full cycle and do a check of the cable tension again.
(g)
Install turnbuckle locking clips on the turnbuckles adjusted in this procedure.
(h)
Remove rig pins R1A and R1B.
32-41-00 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：757 AMM 飞机维护手册 起落架 CHAPTER 32 - LANDING GEAR 2(139)
