Table 601/53-52-00-993-802 RADOME CONDITION NUMERICAL SCALE
RADOME CONDITION COLOR NUMERICAL SCALE
ALLOWABLE SURFACE
AREA of WATER
Good Green 0 to 5 4 in. (102 mm) diameter or
equivalent area
Fair Yellow 5 to 10
Poor Orange 10 to 20
NOTE: Unlimited 1-inch (25.4 mm) diameter areas of water are allowed if they are spaced more than 10 inches (254.0
mm) apart.
(5) Electronic Thermography (alternative) Inspection Method.
(a) Refer to the 737 NDT Part 9, 51-00-01 for equipment, calibration and inspection
instructions.
NOTE: The inspection can be performed from either side of the radome.
(b) Examine the entire surface of the radome.
NOTE: Areas that contain entrapped water will appear cold.
(c) Monitor the surface of the radome with the infrared camera while you use a marker to put
a mark at the boundary of the entrapped water.
(d) If the area that you marked is greater than the allowable area shown in Table 602,
remove the moisture in the marked area and seal it (SRM 53-10-72).
(6) Liquid Crystal (alternative) Inspection Method
(a) Refer to the 737 NDT Part 9, 51-00-01 for equipment, calibration and inspection
instructions.
NOTE: The inspection can be performed from either side of the radome.
(b) Examine the entire surface of the radome.
NOTE: Areas that contain entrapped water will appear cold.
(c) Monitor the surface of the radome with the liquid crystal sheets while you use a marker to
put a mark at the boundary layer of the entrapped water on the transparent template.
(d) If the area that you marked is greater than the allowable area shown in Table 602,
remove the moisture in the marked area and seal it (SRM 53-10-72).
Table 602/53-52-00-993-803 RADAR CONDITION MOISTURE ACCEPTANCE CRITERIA
Moisture Meter Reject Level Allowable Surface Area of Water
20 (4 in. (102 mm) diameter or equivalent area
NOTE: Unlimited 1-inch (25.4 mm) diameter areas of water are allowed if they are spaced more than 10 inches (254.0
mm) apart.
E. Procedure - Do a Check of the Conductor Straps and Diverter Strips
SUBTASK 53-52-00-010-004
(1) Open the radome. Do this task: Nose Radome - Open, TASK 53-52-00-010-802.
SUBTASK 53-52-00-210-003
(2) Do the visual check that follows:
(a) With the radome open, examine the conductor straps for tears, loose areas, burned
areas, and general deterioration.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
53-52-00
Page 603
D633A101-ILF Feb 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
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