(2)
Do a check for moisture in the radome.
(3)
Do a visual check of the diverter strips for damage.
(4)
Do a check of the diverter strips for conductance.
C. You must make sure the installation of the nose radome is correct.
TASK 53-52-01-206-001
2. Nose Radome - Inspection
________________________
A. Standard Tools and Equipment
(1)
Meter - Bonding (Ref 20-22-01/601)
(2)
Detector - Moisture Register (Model: A8-AF) .
Penta Engineering
Moisture Register Products
P.O.BOX 369
La Verne CA 91750-0369
Phone (714) 392-5833
Fax (714) 392-5838
B. References
(1) 53-52-01/201, Nose Radome
C. Access
(1) Location Zone
111 Radome
D. Procedure
S 216-002
(1) Examine the nose radome for holes, scuffs, cracks, blisters, and delamination.
NOTE: To find the delamination, lightly hit the radome skin with
____ a small metal object. For example, you can use a short socket handle.
S 216-012
(2) Look for signs of lightning strikes (Ref 05-51-13/201).
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747-400 MAINTENANCE MANUAL
S 286-003
(3) Do a check for moisture.
NOTE: The moisture register detector measures the
____ conductance of the radome material to find moisture. The register contains two major parts, the gun and the case. The gun contains the electrodes and the oscillator circuits. The case contains the ON-OFF switch, the meter control to adjust to zero, and the batteries.
(a) Adjust the meter until it shows zero:
1) Move the gun part of the moisture register detector to a minimum of 3 inches from an object.
NOTE: An object near the gun will cause the zero
____ adjustment on the meter to change.
2) Push the ON-OFF button on the case of the moisture register detector to ON.
NOTE: The moisture register detector must be on during the
____
full check.
a) Permit the moisture register detector to become stable. b) Use the adjustment knob on the left of the handle to adjust the needle to zero on the dial.
(b) Do a check of the radome: 1) Open the nose radome. 2) Move the gun of the moisture register detector until the
gun electrodes touch the inner surface of the radome. 3) Make sure the eight electrodes touch the surface of the nose radome. 4) Move the gun along all the inner surface and make sure the meter stays in the GOOD (0-5) range. 5) Do a check again of the areas which cause the meter to read more than one.
6) If there is an indication of moisture (above 5 on the scale), remove moisture and seal in accordance with SRM 53-10-72
S 216-004
(4) Make sure the attachment of the aluminum diverter strips is tight.
NOTE: Sharp corners or points along a conductive strip can cause
____
the radio transmission to not operate correctly.
S 216-006
(5) Do a check for burned areas and corrosion.
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747-400 MAINTENANCE MANUAL
S 416-007
(6)
Close the nose radome.
S 766-014
(7)
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
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