K86540
Toilet Upper Shroud Installation 5C8
25-42-12 Figure 401 Jun 20/85
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
ELECTRONIC COMPARTMENT - DESCRIPTION AND OPERATION
1. General
A. The electronic compartment is in the forward part of the airplane, under the passenger cabin floor, just forward of the forward cargo compartment and aft of the nosewheel well. (See figure 1.)
B. The compartment may be entered from the ground through a door which is just aft of the nosewheel well. See Chapter 52, Electronic Equipment Compartment External Access Door.
C. Stanchions and shelves are installed in the compartment to form racks to hold electrical and electronic equipment modules. The stanchions and shelves are hollow to form ducts for the electrical and electronic equipment cooling airflow. See Chapter 21, Equipment Cooling System, for information on equipment cooling.
500 Electronic Compartment
Aug 15/67 Figure 1 25-51-0
Page 1
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
D. A moisture shroud is over the forward equipment rack (E1) and over the space between the forward rack and the two aft racks. The shroud is made of sections of formed plastic sheet fastened to a metal framework. The framework is fastened to the rack stanchions and to airplane body structure.
E. On airplanes with forward airstairs, a drip pan is below the space that is occupied by the forward airstair when the airstair is retracted. The drip pan protects the equipment racks from moisture that the airstair may bring into the compartment. A drain tube leads from the drip pan to the airplane drainage system.
F. A receptacle for 115 volt ac 400 cps power is at the forward end of the aft left equipment rack (E2). It is on the rack's inboard face at about the level of Shelf E2-2. Interphone jacks are in the same area.
G. Insulation blankets line the sidewalls and the bottom of the compartment and the surfaces of the nosewheel well housing that face into the compartment. Most blankets are fastened to structural members by plastic studs and clips. Parts of a few blankets are fastened to structure or to other blankets by velcro tape. A typical blanket has a layer of fiberglass wool, an inboard cover, and an outboard cover. The two covers are stitched or cemented together at the blanket edges. The blanket edges may have a trim strip and fastener tabs. The blankets vary widely in size and shape, each being tailored to fit its surroundings. Foamed plastic panels are on the bottom of the structural members that are just below the passenger cabin floor and that run along both sidewalls from the Station 312 body frame to the compartment aft bulkhead. The panels are cemented to the structural members.
504
25-51-0 Page 2 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 20/85
ELECTRONIC COMPARTMENT DRIP PAN AND MOISTURE SHROUD – REMOVAL/INSTALLATION
1. General
A. This procedure supplies instructions to perform the following tasks:
(1) For airplanes with an airstair installation:
(a)
Removal of the electronic compartment drip pan (airstair) and moisture shroud.
(b)
Installation of the electronic compartment drip pan (airstair) and moisture shroud.
2. Electronic Compartment Drip Pan (Airstair) and Moisture Shroud Removal
A. References
(1)
AMM 20-30-51, Miscellaneous Materials
(2)
AMM 25-51-00, Electronic Compartment
(3)
AMM 51-31-0, Seals and Sealing
(4)
AMM 52-48-41, E/E Compartment Door
(5)
AMM 52-61-0, Forward Airstair
B. Equipment and Materials
(1)
Maintenance Stand
(2)
Adhesive, BAC 5010 Type 60
C. Access
(1)
Location Zones
205 E/E Compartment
(2)
Access Panels
1201 E/E Compartment Door
D. Procedure (Fig. 401)
(1)
Extend the forward airstair for access (AMM 52-61-0).
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