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A
747-400 MAINTENANCE MANUAL
(b) Pull the diverter from the radome.
S 112-015
WARNING: DO NOT GET SOLVENTS IN YOUR MOUTH, OR YOUR EYES, OR ON YOUR
_______ SKIN. DO NOT BREATHE THE FUMES FROM SOLVENTS. SOLVENTS ARE HAZARDOUS MATERIALS. SOLVENTS MAY BE FLAMMABLE OR HARMFUL TO THE ENVIRONMENT. REFER TO PRODUCT MATERIAL SAFETY DATA SHEETS (MSDS) AND LOCAL REQUIREMENTS FOR PROPER HANDLING PROCEDURES.
(3) Remove all the remaining sealant with the cheesecloth that is moist with BMS 11-7, FCC-55, MEK:sec-butyl alcohol (42:58), MEK, or MPK.
TASK 53-52-04-402-004
3. Nose Radome Lightning Diverter Strip Installation_________________________________________________
A. Consumable Materials
(1)
A00247 Sealant - Chromate, BMS 595
(2)
B00083 - Aliphatic Naphtha, TT-N-95
B. References
(1)
53-52-01/201, Nose Radome
(2)
53-52-01/701, Nose Radome
C. Procedure
(1) S 372-005Repair the radome protective finish, when it is necessary (Ref 53-52-01/701).
(2) S 142-006Clean the mating surfaces of the grounding plate and the diverter strip to make sure you have a satisfactory electrical bond.
(3) S 102-018Clean the surface with a rag moistened with aliphatic naphtha and let dry.
(4) S 102-019Clean the radome surface around the insert hole with a rag moistened with solvent and let dry
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747-400
MAINTENANCE MANUAL
3. NOSE RADOME
CONDUCTOR
STRAP
A
A
DIVERTER
STRIPS
(7 LOCATIONS)
FWD
THE SKIN OF THE AIRPLANE
ALUMINUM CONDUCTOR STRAP
ALUMINUM 1 FUSELAGE DIVERTER STRUCTURE STRIP
(REF)
1
RADOME
LOWER RING SEGMENT THE ALUMINUM GROUND CONDUCTOR
SPRING WHICH IS NOT SPRING
PAINTED
A-A
1 ALL MATING SURFACES MUST BE CLEAN AND NOT PAINTED TO SUPPLY A CORRECT GROUND.
Lightning Diverter Strip Installation
Figure 201
G87071
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A 747-400 MAINTENANCE MANUAL
(5) S 392-020Apply BMS5-95 sealant on and around the insert hole in the nose radome and the mating surface of the insert. Completely coat the honeycomb core cells with sealant (Fig. 202).
(6) S 422-021Install the insert immediately before the sealant has a chance to set-up.
(7) S 392-022Make sure there is squeeze out of the sealant all around the insert on both surfaces of the nose radome. The sealant squeeze out on the aerodynamic surface of the nose radome needs to be flush with the surface. This is to accomodate the fit-up of the diverter strips.
(8) S 392-023Apply a fillet seal of BMS5-95 sealant around the flange of the diverter strip insert that is exposed to the interior side of the nose radome.
NOTE:____ It is important to make sure that the diverter strip attach inserts are completely sealed to prevent moisture ingress into the nose radome.
(9) S 422-007Install the lightning diverter strip (Fig. 201). (a) Fill the empty spaces around the grounding plate with the sealant. (b) Apply a thin layer of the sealant on the lightning diverter strip.
NOTE:____ Make sure that no sealant is applied between the diverter strip and the conductor strap.
(c) (d) (e) (f) Install the diverter strip on the radome and install the screws and the nuts (where used).Fill all of the empty spaces around the diverter strip fasteners with the sealant.Make sure there are no clearances between the diverter strip, the conductor strap and the nose radome.Do a test of the electrical resistance (Ref Nose Radome Lightning Diverter Strips Examination).
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