SUBTASK 53-52-00-210-002
(2) Do a check for damage such as holes, scuffs, cracks, blisters, and delamination.
NOTE: You can locate the delamination if you lightly hit the radome skin with a small metal
object such as a short socket extension and listen for changes in the sound.
SUBTASK 53-52-00-280-001
(3) Do a check for moisture.
(a) Moisture that enters the honeycomb cells of a radome can cause the radar transmission
to decrease. Periodic radome inspection is necessary to ensure sufficient radar
transmission. Water that is entrapped in the honeycomb cells can be detected with the
three methods that follow.
(b) There are three radome moisture inspection methods. The recommended method 1 is the
moisture meter inspection method. Two alternative methods are electronic thermography
inspection method and liquid crystal sheets method. (737 NDT Part 9, 51-00-01 and SRM
51-00-01).
(4) Use the moisture indicator/register RADOME equipment, COM-2010 to do a check for
moisture as follows:
NOTE: The moisture indicator/register RADOME equipment, COM-2010 indicates pockets in
aircraft radomes by measuring the radio frequency dielectric power loss of the material
in contact with the moisture indicator/register RADOME equipment, COM-2010 gun.
The radio frequency depth of penetration is approximately 2.5 in. (6.4 cm). Any
conductive materials such as water, aluminum, or metallic fasteners within 3 in.
(7.6 cm) from the gun will cause the meter to read high. It is important that all metallic
parts be removed from the area on the radome that is being tested for moisture
content.
(a) Hold the gun part of the moisture indicator/register RADOME equipment, COM-2010 a
minimum of 3 in. (7.6 cm) from each part.
(b) Push the ON-OFF switch on the case to the ON position.
(c) Put the sensor head on the inner surface of the radome.
1) Make sure that all the electrodes contact the radome surface.
2) If necessary, apply light force to make sure the sensor head contacts the radome
surface.
(d) Move the sensor head over all of the inner surface of the radome. The sensor head must
touch the full inner surface of the radome. To perform an adequate inspection, the sensor
must be indexed at an interval of 1 in. (25 mm) or less.
(e) In areas that cause a meter reading of 20 or greater, put the sensor head away from the
center of the indication (in an adjacent area with a reading of less than 20) Monitor the
meter reading as you move the sensor head toward the of the area.
(f) To identify the area of entrapped water, make marks on the radome at the position of the
electrodes closest to the entrapped water when the meter reading increases to 20.
(g) You must dry and then seal all of the areas where you find moisture.
1) Do these steps until the boundary of the entrapped water is marked.
(h) If there is moisture, dry the radome and refer to SRM 53-10-72 to remove the moisture
and seal it.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
53-52-00
Page 602
D633A101-ILF Oct 15/2016
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
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