NOTE:____Do not use the B-nut to align the tube. Do not let the B-nut touch the bottom of the sleeve shoulder. If you have a leak, you can loosen and tighten the B-nut again.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
20-10-09
ALL ú ú 01 Page 405 ú Sep 20/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
S 434-039
(10) Tighten with your hand the nuts which you cannot tighten with a wrench. Hand tighten until a clear increase in torque occurs, then tighten 1/6 to 1/3 turn more.
NOTE: Tighten the flareless fittings with the BACS13AP sleeves two
____ times (tighten, loosen, and tighten again). The maximum tube collapse permitted after you torque the BACS13AP sleeves is
0.015 inch less than the tube diameter (Fig. 402).
S 434-015
CAUTION:_______ALWAYS KEEP THE CLAMPS TIGHT. TIGHT CLAMPS KEEP THE AREA BETWEEN THE TUBE AND THE CLAMP SURFACES FREE OF UNWANTED MATERIALS AND CONTAMINATION. IF SURFACES ARE NOT CLEAN, DAMAGE BY FRICTION CAN OCCUR.
(11)
Tighten all of the tube clamps.
S 714-046
(12)
If you disconnected more than one hydraulic tube and you think there is a possibility you connected the tubes incorrectly or cross-connected the tubes, do an operational check:
NOTE: Use your own judgement to determine if a check is necessary.
____
(a) Do the post-installation test of one or more of the components to which the tubes are connected as a check.
S 714-045
(13) If you disconnected electrical wires to get access to the tubes and you think there is a possibility you connected the wires incorrectly or cross-connected the wires, do an operational check:
NOTE: Use your own judgement to determine if a check is necessary.
____
(a) Do the post-installation test of one or more of the components to which the wires are connected as a check.
TASK 20-10-09-764-016
4. Electrical Resistance Specifications in the Fuel Tank
_____________________________________________________
A. General
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
20-10-09
ALL ú ú 01 Page 406 ú Sep 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
WARNING: DO NOT USE TITANIUM FITTINGS IN THE OXYGEN SYSTEM TUBING.
_______
FITTINGS CAN CAUSE FIRE OR INJURY TO PERSONS.
(1) Obey this warning during all of this procedure.
NOTE: It is recommended that titanium or steel fittings be
____ used as replacements for aluminum fittings in the high pressure and normal brake return systems between the antiskid module and parking brake module. Titanium or steel fittings may be used as replacements for aluminum fittings in other systems.
B. Equipment
(1) Bonding meter - Model T207 Microhm Bridge,
Type W Bonding Meter, Avtron Manufacturing,
Inc., Cleveland, Ohio
C. Procedure
S 764-017
WARNING: MAKE SURE THAT THE BOND RESISTANCE IS NOT MORE THAN THE VALUES
_______ SHOWN. BOND RESISTANCE IS VERY IMPORTANT IF A LIGHTNING STRIKE OCCURS.
IF IT IS POSSIBLE, USE A METER THAT IS RESISTANT TO AN EXPLOSION. IF NOT, MAKE SURE THE AMOUNT OF DANGEROUS GAS, AS MEASURED BY A GAS DETECTOR, IS LESS THAN 10 PERCENT OF THE LOWER EXPLOSIVE LIMIT.
(1) Remove and install or replace the fittings which have resistances more than the values in Fig. 404 and 405.
(a) Do a check on the resistance again. Do not use bonding jumpers to connect high-resistance hydraulic installations.
S 764-018
(2)
Measure the resistance between the bulkhead fittings and hydraulic tubes (Fig. 407). Make sure the resistance is less than the value in Fig. 404.
S 764-019
(3)
Measure the resistance across the in-line union/tee fittings (tube-to-tube) (Fig. 408). Make sure the resistance is less than the value in Fig. 405.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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 STANDARD PRACTICES - AIRFRAME(15)
