(4)
Measure the bonding resistance between the antenna in the contersunk hole and the aircraft fuselage with a milliohmmeter. Make sure that the resistance value is less than 5 milliohms (Ref. TASK 20-28-00-869-002).
(5)
Install the last countersunk screw (1).
(6)
TORQUE the 4 countersunk screws (1) diagonally to the same value.
Direct Contact Bonding of External Antennas and Antenna Components
Figure 209/TASK 20-28-00-991-018
Subtask 20-28-00-914-053
B. Protection of the Assembly
(1)
Apply SEALANTS (Material No. 09-016) to fill the cavity between the screw heads and the top of the flange.
(2)
Apply SEALANTS (Material No. 09-005) on the screw heads to improve the protection of screws.
5. Close-up
________ Subtask 20-28-00-942-106
A. Make sure that the work area is clean and clear of tool(s) and other items.
TASK 20-28-00-912-006
Electrical Bonding of Pipes
WARNING : USE SOLVENTS/CLEANING AGENTS, SEALANTS AND OTHER SPECIAL MATERIALS
_______
ONLY WITH A GOOD SUPPLY OF AIR.
OBEY THE MANUFACTURERS INSTRUCTIONS.
PUT ON PROTECTIVE CLOTHING.
DO NOT GET THEM IN YOUR MOUTH.
DO NOT SMOKE.
DO NOT BREATHE THE GAS.
THESE MATERIALS ARE POISONOUS, FLAMMABLE AND SKIN IRRITANT.
GET MEDICAL HELP IF YOUR SKIN OR EYES BECOME IRRITATED.
1. Reason for the Job
__________________
Self Explanatory
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific abrasive paper glass type 1
No specific grade 200 emery cloth
No specific lint free cloth
B. Consumable Materials
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. 04-012 USA VV-P-236 PURE MINERALVASELINE OR PETRO- LATUM (Ref. 20-31-00) Material No. 09-001 USA MIL-S-8802 TYPE I CLASS A FUEL TANK SEALANTPOLYSULFIDE (Ref. 20-31-00) Material No. 09-007 USA MIL-S-4383 R BRUSHABLE FUEL RESISTANT COATING (Ref. 20-31-00)
Material No. 11-004 USA MIL-T-81533
1.1.1TRICHLOROETHANE (METHYL CHLOROFORM)
(Ref. 20-31-00)
Material No. 19-003 USA AMS 3819
LINT-FREE COTTON CLOTH (Ref. 20-31-00)
C. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
20-28-00-869-002 Table of the Maximum Permitted Resistance Values 20-28-00-991-006 Fig. 210 20-28-00-991-016 Fig. 211 20-28-00-991-014 Fig. 212 20-28-00-991-024 Fig. 213
3. Job Set-up
__________
Subtask 20-28-00-110-099
A. Removal of the Grease or Oil from the Contact Areas
(1) Remove all the oil and grease contamination with a MISCELLANEOUS (Material No. 19-003) moist with CLEANING AGENTS (Material No. 11-004).
Subtask 20-28-00-120-090
B. Removal of the Surface Protection from the Bonding Areas
(1)
Protect the area around the area to be treated to keep to a limit the effects of the abrasive.
(2)
Remove the protective coating (Alodine paint etc.) from the contact zone with abrasive paper glass type 1 or grade 200 emery cloth. The cleaned areas must be such that after assembly they give a zone between 1 mm (0.0393 in.) and 4 mm (0.1574 in.) around the contact faces.
NOTE : You can bond all the cadmium plated steel or conductive parts
____ without removal ofthe surface protection and without application of sealant (this does not include the tanks).
Subtask 20-28-00-916-094
C. Temporary Protection of the Contact Areas
(1) If you cannot make the connection in less than 1/4 hour apply COMMON GREASE (Material No. 04-012) on the surface without a surface protection. Before the connection clean with a MISCELLANEOUS (Material No. 19-003) moist with CLEANING AGENTS (Material No. 11-004).
Subtask 20-28-00-110-100
D. Cleaning of the Contact Areas
(1) Clean the surfaces without a surface protection and the attachments with a lint free cloth moist with CLEANING AGENTS (Material No. 11-004).
4. Procedure
_________ Subtask 20-28-00-912-056
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