EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
53-52-04
ALL ú ú 03 Page 204 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
RADOME SHELL EXTERIOR SURFACE APPLY LIBERAL COAT OF BMS 5-95 PER BAC5000 TO ALL FAYING SURFACES OF THE NYLON INSERT TO SEAL OFF CORE MATERIAL. INSTALL WITH SCREW. A 0.1200 INCH BEAD
OF BMS 5-95 IS ACCEPTABLE AROUND
DIVERTER STRIP
FILLET
RADOME SHELL
PERIPHERY OF MOLDED FASTENER.
NYLON SEALANT INTERIOR
SURFACE
INSERT
Insert/Sealant Installation
Figure 202
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
53-52-04
ALL ú ú 03 Page 205 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
L07893
A
747-400 MAINTENANCE MANUAL
TASK 53-52-04-702-009
4. Nose Radome Lightning Diverter Strips Examination
_________________________________________________
A. General
(1) This procedure gives instructions to do an electrical continuity test for all parts that are related to the lightning diverter strips. You must do this test after you install the new diverter strips or when the inspection shows deterioration. The deterioration of the lightning diverter strips can cause radio noise interference.
B. Standard Tools and Equipment
(1) Bonding meter (Ref 20-22-01/601)
C. References
(1)
20-22-01/601, Bonding Meter
(2)
53-52-01/201, Nose Radome
D. Examine the diverter strips visually.
S 212-010
(1) Examine the diverter strips and make sure that they are correctly installed.
NOTE: Sharp corners or points on locations along a diverter
____ strip will cause radio interference.
S 212-016
(2) Make sure that there are no burns, burned areas and corrosion.
E. Examine the electrical resistance of the diverter strips, with a bonding meter.
S 012-011
(1)
Open the nose radome (Ref 53-52-01/201).
S 762-012
(2)
Make sure that the electrical resistance between each of these pairs of the components is no more than 0.01 ohm (Ref 20-22-01/601).
(a) The diverter strip and the conductor strap
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
53-52-04
ALL ú ú 05 Page 206 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
(b)
The conductor strap and the conductor spring
(c)
The diverter strip and the lower ring segment.
S 412-013
(3)
Close the nose radome (Ref 53-52-01/201).
S 762-014
(4)
Measure the resistance between the diverter strips and the body structure skin.
(a) Maximum reading should be 0.01 Ohms although in-service values up to 0.1 Ohms are common.
NOTE: Resistances above 0.01 Ohms can indicate potential
____ corrosion build-up on faying surfaces. High readings can be reduced by cleaning those surfaces as indicated below.
1) If resistances are not met, clean faying surfaces between radome conductor spring and conductor channel with fine abrasive paper and recheck reading.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
53-52-04
ALL ú ú 04 Page 207 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
