(4)
AMM 20-11-14/701, Metal Surfaces
(5)
AMM 20-11-15/401, Bonding Jumpers and Ground Leads
(6)
AMM 20-22-01/601, Electrical Bonding
(7)
AMM 24-22-00/201, Manual Control
(8)
AMM 28-11-00/201, Fuel Tanks
(9)
AMM 28-11-02/401, Reserve and Main Fuel Tank Access Door
(10)
AMM 29-11-00/201, Main Hydraulic Supply System
(11)
AIPC 29-11-22, Fig. 2 (Outboard)
(12)
AIPC 29-11-22, Fig. 4 (Inboard)
C.
Access
(1)
Location Zone 546 System 1-Outboard Main Tank, Mid Spar to Rear Spar 544 System 2-Inboard Main Tank, Mid Spar to Rear Spar 644 System 3-Inboard Main Tank, Mid Spar to Rear Spar 646 System 4-Outboard Main Tank, Mid Spar to Rear Spar
(2)
Access Panel
573CB Hydraulic Access Panel-System 1
664AB Main Tank Access Door-System 1
544AB Main Tank Access Door-System 2
644AB Main Tank Access Door-System 3
673AB Hydraulic Access Panel-System 4
646AB Main Tank Access Door-System 4
D.
Procedure
S 424-034
(1)
Install the heat exchanger:
(a)
Remove the finish from the flange of the heat exchanger fittings (AMM 20-11-14/701).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
29-11-22
ALL ú ú 01 Page 404 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(b)
Remove the finish from the surface around the heat exchanger holes on both sides of the rear spar where the fittings and washers will touch (AMM 20-11-14/701).
(c)
Put the heat exchanger in the approximate installed position.
1) Make sure the inlet and outlet fittings are adjacent to the holes in the rear spar.
(d)
Remove the caps from the heat exchanger fittings.
(e)
Lubricate all the new packings, the backup rings, and the component threads with hydraulic fluid.
(f)
Install the packings in the grooves in the inlet and outlet fittings.
CAUTION: DO NOT APPLY THE CONVERSION COATING ON THE FLANGES OF THE
_______ HYDRAULIC HEAT EXCHANGER FITTINGS. IF YOU DO, THE ELECTRICAL RESITANCE MAY BE HIGHER THAN THE BONDING REQUIREMENT.
(g) Apply Alodine 600 to the cleaned surfaces around the holes of the rear spar.
NOTE: Alodine 600 gives a better electrical conductive
____ coating. Not all types of Alodine are electrically conductive and some types of Alodine can cause a powdery coating if used on the fuel tank paint finishes.
(h)
Clean the inlet and outlet fittings on the heat exchanger and put them in their positions through the holes in the spar.
(i)
Install the fitting washers and nuts. Do not tighten.
(j)
Install the mounting bolts, washers, shims, and nuts for the heat exchanger.
CAUTION: WHEN YOU TIGHTEN THE FITTING NUTS, HOLD THE FITTINGS WITH
_______ A WRENCH AT THE FORWARD SIDE OF THE REAR SPAR. IF YOU DON'T, THE TUBES MAY TWIST AND CAUSE DAMAGE TO PARTS.
(k) Tighten the bulkhead nuts on the inlet and outlet fittings to 600-700 pound-inches (65-75 N.m).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
29-11-22
ALL ú ú 03 Page 405 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
WARNING:_______OPEN FUEL TANK IS AN EXPLOSIVE VAPOR AREA. MAKE SURE YOU USE AN EXPLOSION-SAFE BONDING METER TO CHECK THE ELECTRICAL RESISTANCE.
CAUTION:_______ MAKE SURE THE BONDING JUMPER OF THE HYDRAULIC HEAT
EXCHANGER IS NOT CONNECTED TO THE WING STRUCTURES. IF YOU
DO, YOU CAN GET AN INCORRECT ELECTRICAL RESISTANCE
MEASUREMENT AT THE REAR SPAR BONDING SURFACE.
(l)
Make sure the resistance between the fittings and spar are satisfactory (AMM 20-22-01/601): 1) The resistance between the hydraulic fitting flange and the
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：747-400 AMM 飞机维护手册 液压 HYDRAULIC 2(38)
