(2)
Remove power from the electrical system (Ref 24-22-0 MP).
B. Loosen discharger setscrew and remove discharger from base.
CAUTION: THE DISCHARGER IS SECURED TO THE BASE BY A BRISTOL HEAD SCREW. CARE MUST BE EXERCISED WHEN REMOVING OR INSTALLING DISCHARGER TO ENSURE THE THREADS OR RECESSED HEAD OF THE SETSCREW IS NOT DAMAGED.
C. Mark position of discharger base beyond cleaning area with a nondestructive marking. Check that line is parallel with slipstream.
D. Remove rivets from base per 51-30-2 in Structural Repair Manual.
E. Scrape off sealant along one edge of base with plastic scraper and apply chemical stripper to adhesive fillet.
F. After 30 minutes the surface of the sealant will soften and may be scraped off with a plastic scraper.
G. Insert a sharp, broad-bladed putty knife under edge of base and lift base off.
CAUTION: EXTREME CARE MUST BE TAKEN TO AVOID DAMAGING AIRPLANE SURFACES, ESPECIALLY HONEYCOMB PANELS.
3. Install Static Discharger Base (Fig. 401)
A. Prepare to Install Static Discharger Bases
(1)
Remove pressure and power from the hydraulic systems for the applicable flight control surfaces (Ref 27-11-0 MP, 27-21-0 MP, 27-31-0 MP).
WARNING: MAKE SURE PRESSURE IS REMOVED FROM HYDRAULIC SYSTEMS. MAKE SURE HYDRAULIC POWER AND ELECTRICAL POWER ARE NOT SUPPLIED. IF HYDRAULIC PRESSURE IS PRESENT OR HYDRAULIC / ELECTRICAL POWER IS SUPPLIED, THE FLIGHT CONTROL SURFACES CAN MOVE. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(2)
Remove power from the electrical system (Ref 24-22-0 MP).
(3)
Aluminum skin
(a)
Build a dam around sealant residue using putty or modeling clay and fill dam with stripper until sealant is completely covered. Allow sealant to soften for 30 minutes or longer if necessary.
(b)
Scrape sealant with a plastic scraper. Depending on thickness of sealant repeat step
(a) until all residue is removed.
(c)
Clean and degrease bonding area with applicable cleaning solvent, Series 88 (Ref. 20-30-88). Apply solvent from squeeze bottle or safety can with clean oil-free gauze or cheesecloth.
WARNING: DO NOT GET SOLVENT IN YOUR MOUTH OR EYES, OR ON YOUR SKIN. DO NOT BREATHE THE FUMES FROM SOLVENTS. SOLVENTS ARE HAZARDOUS MATERIALS. REFER TO PRODUCT MATERIAL SAFETY DATA SHEETS (MSDS) AND LOCAL REQUIREMENTS FOR PROPER HANDLING PROCEDURES.
(d)
Wipe off solvent before it evaporates using more clean gauze or cheesecloth. Do not touch surface with fingers.
(e)
Prepare sealant as described in par. 3.B. below.
(f)
Abrade surface with new 600-grit abrasive paper or cloth until all shine is removed and surface takes on a uniform satin sheen.
NOTE: Because abrasive paper or cloth loads up rapidly, change paper or cloth frequently.
(g)
Remove sanding dust by wiping with clean dry gauze or cheesecloth. Do not use solvent.
NOTE: If surface is painted, remove paint from an area approximately 1/4 inch wider on all sides of discharger base outline.
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CAUTION: INSTALL STATIC DISCHARGER BASES WITHIN 5 MINUTES AFTER SANDING TO PREVENT ALUMINUM OXIDATION.
(4) Fiberglass Laminates
(a) Remove sealant by sanding with 180-grit or finer sandpaper.
CAUTION: TAKE CARE NOT TO SAND THROUGH RESIN SURFACE INTO GLASS FABRIC. DO NOT USE CHEMICAL STRIPPERS.
NOTE: A surface 90% clear of sealant is satisfactory.
(b)
Clean and degrease bonding area with applicable cleaning solvent, Series 88 (Ref 20-30-88). Apply solvent from squeeze bottle or safety can with clean oil-free gauze or cheese cloth.
WARNING: DO NOT GET SOLVENT IN YOUR MOUTH OR EYES, OR ON YOUR SKIN. DO NOT BREATHE THE FUMES FROM SOLVENTS. SOLVENTS ARE HAZARDOUS MATERIALS. REFER TO PRODUCT MATERIAL SAFETY DATA SHEETS (MSDS) AND LOCAL REQUIREMENTS FOR PROPER HANDLING PROCEDURES
(c)
Wipe off solvent before it evaporates using more clean gauze or cheesecloth. Ascertain that area is not contaminated.
NOTE: Because of difficulty in keeping surfaces uncontaminated, complete cleaning no sooner than 1 hour before bonding.
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B. Install Static Discharger Bases
(1) Prepare sealant as follows:
(a)
Mix all of part B, hardener (1 part), with all of part A resin, (10 parts), in a clean glass or metal container. Do not use waxed or porous paper container.
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