B. References
(1) AMM 20-30-80/201, Solvent - Series 80
C. Consumable Materials
(1)
B00139 Lacquer Thinner - Federal Spec TT-T-266,
or equivalent
(2)
B00148 Methyl Ethyl Ketone (MEK) - TT-M-261
(3)
G00033 Lint-free cheesecloth
D. Procedure
S 157-023
WARNING: DO NOT GET SOLVENT IN YOUR MOUTH, OR EYES, OR ON YOUR SKIN. DO NOT BREATHE THE FUMES FROM SOLVENTS. SOLVENTS ARE HAZARDOUS MATERIALS. REFER TO PRODUCT MATERIAL SAFETY DATA SHEETS (MSDS) AND LOCAL REQUIREMENTS FOR PROPER HANDLING PROCEDURES .
(1) Apply lacquer thinner or solvent, Series 80 (AMM 20-30-80/201) to the specified area with a clean cheesecloth.
NOTE: Use a clean piece of the cheesecloth each time you
____ apply lacquer thinner or solvent. Do not let lacquer thinner or solvent touch areas where it is not necessary to remove paint.
S 117-009
(2) When the specified area is completely clean, immediately rub dry with a clean cheesecloth.
TASK 20-10-22-117-010
6. Solvent Clean Bare, Clad, or Plated Metal_________________________________________
A. General
(1) Use this task to clean plated surfaces and CRES or alclad aluminum that is not painted.
B. Equipment
(1) Nonmetallic brush or cloth applicator
C. Consumable Materials
(1)
G00033 Lint-free cheesecloth
(2)
B00316 Solvent - Aliphatic Naphtha, TT-N-95,
Type I
D. Procedure
S 117-011
(1)
Apply solvent to the bonding surfaces with a brush that is not metal or a cloth applicator.
(2)
Rub with force to remove contamination you can see.
(3)
Immediately dry surfaces with lint-free cheesecloth.
S 117-012
S 117-013
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
20-10-22
ALL ú ú 01 Page 705 ú Sep 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
LOCKWIRES - REMOVAL/INSTALLATION
________________________________
1. General_______
A. This procedure contains two tasks. The first task is the removal of lockwires. The second task is the installation of lockwires.
B. If this procedure does not agree with specified maintenance procedures, use the specified maintenance procedures.
C. Use lockwires one time only. If lockwires are used more than one time, failure can occur.
D. Install the lockwire so when parts become loose they will put the lockwire in tension.
E. Twist the ends of the lockwire three to six times. Bend the twisted ends back or under to make a shield around the ends. Make sure the ends cannot catch something.
F. Use the double-twist lockwire procedure for all lockwires unless a single-wire procedure is specified.
G. Install and twist the safety wire so the loop around the head stays down. (If the loop tended to come up over the bolt head there would be a slack loop.)
H. For multiple fasteners spaced less than four inches apart, the maximum number which can be safety wired together shall be the number than can be wired with a 24-inch length of wire.
I. For fasteners four to six inches apart, wire together in series no more than three fasteners.
J. Where fasteners are more than six inches apart, do not tie them in series unless tie points are provided on adjacent parts to shorten the wire span to less than six inches.
K. Use a right-handed twist for all double twist installations.
L. Safety-wire diameter shall be between 1/3 and 3/4 of the hole diameter, 0.032-inch diameter minimum.
M. Safety-wire 0.020 inch in diameter may be used if:
(1)
The safety-wire hole is 0.045 inch diameter or smaller, or
(2)
The spacing between parts is less than two inches and the safety
wire hole diameter is between 0.045 and 0.062 inch diameter. ~.............................................................................. | TWIST PER INCH | ................................................................................ | | | 0.019 | 0.023 | 0.043 | | |Safety Wire| Less Than | to | to | to | More Than | | Dia. Inch | 0.019 | 0.026 | 0.042 | 0.065 | 0.065 | ................................................................................ |Twists/Inch| 11 to 14 | 9 to 12 | 7 to 10 | 5 to 8 | 4 to 7 | 2...........…...........…............….............….............….............1
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