WARNING: BEFORE YOU OPERATE THE STROBE LIGHTS, TELL PERSONNEL NEAR THEM
_______ NOT TO LOOK DIRECTLY AT THEM WHEN THEY FLASH. IF YOU LOOK AT THE STROBE LIGHT WHEN YOU ARE NEAR IT, IT CAN CAUSE TEMPORARY VISION PROBLEMS.
(10) Do a test of the strobe lights.
(a)
Set the BEACON STROBE LTS switch on the pilots' overhead panel P5 to ON and make sure that the strobe light operates.
(b)
Set the BEACON STROBE LTS switch to OFF.
S 714-020
(11) Do a test of the navigation lights.
(a) Set the NAV lights switch on the pilots' overhead panel P5 to ON.
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747-400 MAINTENANCE MANUAL
(b)
Look to see that the wingtip navigation light comes on.
(c)
Set the NAV lights switch to OFF.
S 864-021
(12)
Remove electrical power if it is not necessary (Ref 24-22-00/201).
S 764-022
(13)
Use a bonding meter to measure the electrical resistance between the forward fairing and the leading edge of the wing extension.
(a) The maximum permitted resistance is 0.0025 ohm.
S 344-023
(14)
Apply sealant to the skin joints.
S 344-010
(15)
Remove the unwanted sealant to align the sealant with the panels.
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747-400
MAINTENANCE MANUAL
WINGTIP FORWARD FAIRING - REPAIRS
_________________________________
1. General
_______
A. This procedure contains two tasks. One task is to repair the navigation light lens in the forward fairing of the wingtip. The other task provides instructions for a temporary repair for the lens cover for limited flight.
(1)
Repair the lens as follows:
-
Remove the wingtip forward fairing
-
Remove the plastic lens
-Stop drill the crack
-Put a plug in the drilled hole
-
Install the plastic lens
-
Install the wingtip forward fairing
-Polish the lens.
(2)
If you find any cracks in the acrylic plastic of the navigation light lens, you must repair them.
(3)
For a temporary repair, use a stop drill, RTV-174, and Clear Mylar Tape.
NOTE: This repair is only a temporary repair to prevent a flight
____ delay or cancellation and will allow the airplane to fly until replacement parts can be obtained and installed.
(4) Inspection of repaired lenses will be required prior to each flight.
TASK 57-23-01-308-016
2. Repair the Lens
_______________
A. Standard Tools and Equipment
(1)
Drill Motor
(2)
Bits - Drill, 1/4 inch or 3/8 inch
(3)
Soap and Water
B. Consumable Materials
(1)
A00000 Cement - PS-30
(2)
A00000 Cement - PS-18 (optional to PS-30)
(3)
A00966 Cement - EC-2216 B/A (Optional to PS-30)
(4)
G00000 Paper - Abrasive, Wet or Dry, 240, 280, 320, 400, 600 Grit
(5)
G00000 Sheet - Acrylic Plastic, per MIL-P-8184 or MIL-P-5425, 0.10 Inch Thick
(6)
B00083 Solvent - TT-N-95, Aliphatic Naphtha
(7)
G00000 Tape - Masking
(8)
G00000 Cellophane
(9)
G00000 Chamois
(10)
G00000 Cloth - Cotton Flannel
(11)
G00000 Block - Rubber, Durometer Reading of 35 |5, Shore A Scale, or Wood
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