Airframe Drainage - Fuselage 571
51-41-11 Figure 601 Oct 20/84
Page 602
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
EXTERNAL DRAINAGE - APPROVED REPAIRS
General
A. A drainage leveling compound is used throughout the airplane and may be repaired using the
procedure described in this subject.
Equipment and Materials
A. Hardwood tool
B. Stiff-bristle brush
C. Solvent - General Cleaning of Metal (Series 80) (Ref AMM/SOPM 20-30-80)
D. Adhesive - Epon 815 (Ref 20-30-11)
E. Curing Agent - T (Ref 20-30-11)
F. Compound - Self Leveling for Body - BMS 5-125A (Ref 20-30-11)
3. Repair Drainage Leveling Compound
A. With a hardwood tool, loosen and/or remove chipped or damaged leveling compound.
B. Remove all loose pieces of leveling compound with stiff bristle brush.
C. Thoroughly clean structure and remaining leveling compound with solvent.
D. Mix adhesive and curing agent.
E. Mix leveling compound and catalyst.
NOTE: Deleted
F. Mix compounds from steps D and E into final leveling compound.
NOTE: Potting compound and catalyst may be used without step D compound if top surface of compound can be kept on waterline level.
G. On airplanes with spring type drain valves, pour leveling compound. Compound must be level with bottom of drain hole or within 0.06 inch of spring drain valve contact area, whichever is applicable.
NOTE: Leveling compound must not enter spring drain valve contact area. Airplane must be either in a level or taxi attitude when compound is poured.
H. On airplanes with removable drain valves, pour leveling compound. Compound must be level with top of drain hole or bottom of drain valve retainer opening.
NOTE: Airplane must be either in a level or taxi attitude when compound is poured and remain that way until leveling compound has gelled (6 hours at 72 + 5°F). Full cure takes 7 days.
May 01/98 51-41-11 Page 801 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
INTERNAL DRAINAGE - INSPECTION/CHECK
1. General
A. All internal drains must be checked at regular intervals to ensure proper drainage and prevent a possible fire or corrosion hazard.
2. Equipment and Materials
A. Wiping cloths
B. Mild Cleaner - GMC 528B
3. Check Internal Drains
A. Check internal drains frequently and keep free from obstructions. If required, clean drains per par. B.
(1)
Gain access to upper surface of wing center section by removing floor panels as required (Ref 53-21-0, Removal/Installation).
(2)
Check drain openings through aft lower corner of ribs at pressure deck beam.
B. Clean Drains
(1)
Using cloth moistened in water-cleaner solution, if required for set soils, remove all soils and obstructions from drains.
(2)
Check and clean horizontal drain hole (Fig. 601).
501
Jun 20/83 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 51-41-12 Page 601
F85838
Internal Drainage 501
51-41-12 Figure 601 Jun 20/83
Page 602
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
500 Internal Drain Paths
Feb 20/90 Figure 602 (Sheet 1) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 51-41-12 Page 603
Internal Drain Paths 500
51-41-12 Page 604 Figure 602 (Sheet 2) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 20/90
FUSELAGE DRAIN VALVE - REMOVAL/INSTALLATION
1. General
A. Removal and installation of fuselage drain valve is done from outside the airplane.
2. Special Tools and Materials
A. Special Tools
(1) Installation Tool 2024 (Stewart Industries Inc., 5210 14th Avenue Northwest, Seattle, WA 98107-3795).
3. Removal Fuselage Drain Valve
A. Use installation tool to loosen valve assembly.
CAUTION: USE OF STEEL WRENCH MAY DAMAGE VALVE.
B. Remove valve assembly from retainer.
4. Install Fuselage Drain Valve
A. Clean the valve in a mild detergent solution.
B. Put valve assembly into fuselage hole.
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