(b)
Mix thoroughly with wood tongue depressor until mixture is smooth and uniform in color. Take care not to entrap air in the mixture.
(c)
Allow sealant to stand for 10 minutes prior to application.
CAUTION: SEALANTS CONTAIN EPOXY RESIN. AVOID BREATHING VAPORS, CONTACT WITH EYES, SKIN OR CLOTHING. WASH HANDS FREQUENTLY.
NOTE: Pot life for 1-ounce kit after mixing is approximately 1 hour at 70oF. One 1-ounce kit is suitable for about six dischargers.
(2)
Remove metal discharger base from plastic bag without touching mounting surface with fingers, and abrade surface per steps A.(1)(c) thru A.(1)(f).
NOTE: Do not abrade plated bases, but clean per steps A.(1)(c) and A.(1)(d). A plated base has a green dot on it for identification. Wear gloves when handling bases.
(3)
Attach the base to the airplane surface:
(a) Make sure you install the base in the same direction as the airstream.
(4)
Install the fasteners:
(a)
Attach the base to the aluminum structure in 5 minutes or less to prevent aluminum oxidation. 1) Use rivets to attach the base to the airplane surface
(SRM 51-40-02/201). 2) Apply sealant, BMS5-95 to the rivet (AMM 51-31-00/201).
(b)
Attach the base to the composite structure. 1) Apply sealant, BMS 5-95 to the screws (AMM 51-31-00/201). 2) Use the four 5/32 inch screws to attach the base to the structure.
(5)
Apply a bead of sealant, BMS 5-95 to the edge of the discharger base.
(a)
Make a fillet seal around the discharger base
(AMM 51-31-00/201).
(b)
Make sure no cracks are seen, this includes airplane surfaces that do not correctly align with the base.
(c)
Clean away unwanted sealant with a cloth that is moist with methyl ethyl ketone, BMS 11-7, FCC-55, MEK:sec-butyl alcohol (42:58), or MPK.
CAUTION: BE SURE NOT TO WASH AWAY FILLET.
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.
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(6) Cure trailing edge and tip type bases.
(a)
If base is not riveted, tape base firmly to airplane surface with masking tape, or if heat clamp is to be used, place polyvinyl alcohol film over base. Check alignment before cure.
NOTE: Tape a thermocouple adjacent to the bond area to aid in indicating bond line temperature.
(b)
Set an infrared lamp, heat clamp or blower directly over the base. Position lamp about 4 to 6 inches from base.
(c)
Adjust blower, heat clamp or infrared lamp to give a bond line temperature as indicated in following chart.
Temp (°F) Minimum Cure Time
60 48 hours 75 24 hours 130 3 hours
CAUTION: DO NOT CURE SEALANT BELOW 60°F OR ABOVE 130°F.
(d)
Cure for time shown below. Cure is complete when sealant cannot be indented with knife.
(e)
Check that fillet has durometer reading of 30 before returning airplane to service.
(7)
Fill any visible gaps or cracks in fillet or between base and airplane surface with fresh sealant.
(8)
Check static discharger base.
(a)
When sealant is fully cured and cooled to between 70 and 80°F, check for cracks in sealant fillet between base and airplane surface. Any crack is cause for rejection.
(b)
Check electrical bond between discharger bases and aluminum structure per 20-22-01. Resistance for newly installed dischargers should not exceed:
0.01 ohms for dischargers mounted on metal panels.
0.10
ohms for dischargers mounted on fiberglass laminate or composite panels coated with aluminum flame spray and dischargers mounted on aluminum coated glass fabric.
1.0
ohms for dischargers mounted on composite panels without aluminum coating.
WARNING: MAKE SURE THAT THE BONDING METER IS RESISTANT TO EXPLOSION. IF NOT IT IS POSSIBLE THAT AN EXPLOSION OR FIRE CAN OCCUR.
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(9) Install Static Discharger
NOTE: Before installing new discharger, check general condition of discharger. Reject discharger with blunt or bent pins.
(a)
Fit static discharger on mounting base.
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