30-43-00
ALL ú ú 01A Page 202 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
NOZZLE - CLEANING/PAINTING
__________________________
1. General_______
A. This procedure has these tasks to clean the spray nozzles located at the bottom of the windshields:
(1)
Remove the nozzle.
(2)
Clean the nozzle spray holes.
(3)
Blow out unwanted material.
(4)
Install the nozzle.
(5)
Operational test of the windshield washer system.
TASK 30-43-01-107-001
2. Clean Nozzle____________
A. Standard Tools and Equipment
(1)
Wire - 0.031-inch diameter (to clean nozzle spray holes)
(2)
Source of compressed air
B. References
(1)
AMM 30-44-00/501, Windshield Washer System
(2)
AMM 30-44-02/401, Windshield Washer Nozzle System
C. Access
(1) Location Zone 221 Control Cabin, LH - Outside No. 1 Left Window 222 Control Cabin, RH - Outside No. 1 Right Window
D. Procedure
S 027-002
(1)
Do this task: "Nozzle Removal" (AMM 30-44-02/401).
(2)
Clean the nozzle spray holes with 0.031-inch diameter wire.
(3)
Blow out all unwanted material with compressed air.
(4)
Do this task: "Nozzle Installation" (AMM 30-44-02/401).
S 717-006
(5)
Do this task: "Operational Test - Windshield Washer System" (AMM 30-44-00/501).
S 147-003
S 167-004
S 427-005
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30-43-01
ALL ú ú 03 Page 701 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
WINDSHIELD WASHER SYSTEM - DESCRIPTION AND OPERATION____________________________________________________
1. General (Fig. 1)_______ A. The windshield washer system sprays washing fluid on the pilots' No. 1 windows. The windshield washer system consists of a washer fluid container, a pump, two solenoid valves, two nozzles and two control switches on the anti-ice-rain removal module. The pump motor is powered by 3-phase 115/200 volts ac from ac bus 4. The solenoids are powered by 28 volts dc from dc bus 4. The windshield wiper must be used when cleaning the windshield with the windshield washer system. B. All components of the windshield washer system except the nozzles and control switches are mounted inside the windshield washer access door on
the captain's sidewall below the No. 3L window. The container is visible through an opening in the access door. A fluid level mark on the outside of the door indicates the refill level. When this level is reached, 100
cc of fluid remains.
2. 3. 4. Container and Receptacle________________________ A. The container is a narrow mouth plastic bottle. It is mounted vertically and screws into a cap (receptacle) containing the fluid pickup tube. The capacity of the container is 1 quart. The container rests on a drip tray so that any spillage from the bottle or from the pump overflow port drains through the airplane drip shield.Pump____ A. The window washer pump M13 is a gear type pump driven by a 0.02 hp 3-phase motor. The pump is rated at 26 psi at 7200 rpm. A pressure relief valve on the pump will open at 60 psi.Valves______
A. The solenoid valves (V33 - left, V34 - right) are electrically operated 28-volt dc valves which are normally closed. The valves control the flow of the washer fluid to the nozzles.
5. Nozzles_______
6. A. The nozzles are mounted externally at the base of the No. 1 windows approximately 14 inches inboard of the windshield wiper shaft. Each nozzle has four spray holes. One hole is used to apply washer fluid on the window. The other three holes are used to apply rain repellent fluid. The two supply lines are concentric within the nozzle and separated by O-rings.Operation (Fig. 2)_________ A. Functional Description
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú 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 防冰和排雨 ICE AND RAIN PROTECTION(71)
