(2)
The installation procedure for all the antennas is the same.
B. Equipment
(1)
Sealant removal tool (hardwood or plastic)
(2)
Torque Wrench - approved for 20-25 inch-pounds
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A
747-400
MAINTENANCE MANUAL
(3)
Gloves, neoprene or rubber; Commercially available
(4)
Goggles; Commercially available
(5)
Respirator; Commercially available
(6)
Resistance Measuring Bridge or Ohmmeter - approved for a measurement of 0.01 ohms, or less
(7)
Bristle Brush - not metal
C. Consumable Materials
(1)
A00246 Compound, Sealing - BMS 5-95, Class B 1/2
(2)
B00148 Solvent, Methyl Ethyl Ketone (MEK), TT-M-261
(3)
C00064 Coating - surface treatment - MIL-C-5541, Type II, Grade C class 1 for Aluminum or Aluminum Alloys - Alodine 1000 Clear or 1200.
(4)
G00009 Compound, Corrosion Inhibiting - BMS 3-27
(5)
D00294 Grease - BMS 3-24
(6)
G00034 Lint Free Cheese Cloth
D. References
(1)
AMM 20-22-01/601, Electrical Bonding
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 34-33-00/501, Radio Altimeter System, Adjustment/Test
(4)
AMM 34-33-02/401, Radio Altimeter Receiver/Transmitter,
Removal/Installation
(5)
AMM 51-21-04/701, Alodine Coating - Cleaning/Painting
(6)
AMM 51-24-13/701, Water Displacing Corrosion Preventive Compound
(7)
AMM 51-31-01/201, Seals and Sealing
E. Access
(1) Location Zone
129 Keel Beam
F. Procedure
S 864-011
(1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P7 Overhead Circuit Breaker Panel
1) 7B3 LEFT RAD ALTM
2) 7B4 CENTER RAD ALTIM
3) 7C21 RIGHT RAD ALTIM
S 024-034
(2) Gain access to the center equipment center (Rack E9) and remove the applicable radio altimeter R/T connected to the antenna (AMM 34-33-02/401).
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747-400 MAINTENANCE MANUAL
S 114-112
WARNING:_______ DO NOT GET SOLVENTS IN YOUR MOUTH, OR YOUR EYES, OR ON YOUR
SKIN. DO NOT BREATHE THE FUMES FROM MEK. PUT SOLVENTS ARE
HAZARDOUS MATERIALS. SOLVENTS MAY BE FLAMMABLE OR HARMFUL TO
THE ENVIRONMENT. REFER TO PRODUCT MATERIAL SAFFETY DATA SHEETS
(MSDS) AND LOCAL REQUIREMENTS FOR PROPER HANDLING PROCEDURES.
(3)
Clean the airplane surface and antenna with solvent, Series 88 (AMM 20-30-88).
S 114-116
(4)
If the airplane surface has corrosion or other damage, do these steps to prepare the airplane surface:
(a) Do this task to apply a layer of alodine to the airplane mating surfaces: "Apply Alodine 1000 Solution" (AMM 51-21-04/701).
NOTE: This task removes corrosion, cleans the surface,
____ and applies the alodine.
(b) Apply two layers of BMS 10-79 Type III primer to the airplane skin. 1) Let each layer dry for the correct cure time.
S 394-068
(5)
Apply a layer of BMS 3-27 on the Alodine primer (AMM 51-24-13/701)
S 394-060
(6)
Apply a layer of BMS 3-27 in the fairing thru-hole.
S 394-036
(7)
Fill the antenna nutplates on the fairing with BMS 3-27 through the top hole on the nutplates.
S 394-037
(8)
Put a layer of BMS 3-27 on and around the nutplates to protect them from corrosion.
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