(f)
Do the procedure to Clean the External Surfaces of the Airplane in the polished area.
(g)
Put some water on the surface, and make sure the water becomes drops.
(h)
If the surface was conversion coated before it was polished, apply Alodine 1000 with a swab, cloth, or sponge (AMM 51-21-04/701).
S 603-019
(2) PROCEDURE II - Polish the surface to remove heavy stains or scratches that do not penetrate the clad aluminum.
(a) Use these steps to find if the scratch penetrated the clad aluminum: 1) Apply TT-N-95 cleaning solvent to a wiper.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
12-25-01
ALL ú ú 01 Page 346 ú Sep 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
2) Use the wiper to clean the area around the scratch.
3) Dry the surface.
4) Apply masking tape around the scratch.
NOTE: Make sure there is no more than 1/32 inch of bare
____
metal around the scratch.
WARNING: DO NOT GET CLAD PENETRATING SOLUTION IN YOUR EYES, ON
_______ YOUR SKIN, OR ON YOUR CLOTHES. IF YOU GET CLAD PENETRATING SOLUTION IN YOUR EYES, IMMEDIATELY FLUSH YOUR EYES WITH WATER. IF YOU GET CLAD PENETRATING SOLUTION ON YOUR SKIN, IMMEDIATELY FLUSH YOUR SKIN WITH WATER. MAKE SURE YOU WEAR SPLASH GOGGLES OR A FACE SHIELD. MAKE SURE YOU WEAR CHEMICAL RESISTANT GLOVES WHEN YOU PREPARE THE CLAD PENETRATING SOLUTION.
5) Prepare the clad penetrating solution as follows:
a) Mix 200 grams of Potassium Nitrate (KNO3) and 100 grams of Sodium Hydroxide (NaOH) with sufficient water to make one liter of clad penetrating solution.
WARNING: DO NOT GET CLAD PENETRATING SOLUTION IN YOUR EYES, ON
_______ YOUR SKIN, OR ON YOUR CLOTHES. IF YOU GET CLAD PENETRATING SOLUTION IN YOUR EYES, IMMEDIATELY FLUSH YOUR EYES WITH WATER. IF YOU GET CLAD PENETRATING SOLUTION ON YOUR SKIN, IMMEDIATELY FLUSH YOUR SKIN WITH WATER. MAKE SURE YOU PUT ON SPLASH GOGGLES OR A FACE SHIELD. MAKE SURE YOU PUT ON CHEMICAL RESISTANT GLOVES WHEN YOU APPLY THE CLAD PENETRATING SOLUTION..
CAUTION: MAKE SURE YOU PUT THE CLAD PENETRATING SOLUTION ONLY
_______ ON THE SCRATCH. THE SOLUTION WILL CAUSE DAMAGE TO THE SURFACE WHERE IT IS APPLIED.
6) Apply one drop of clad penetrating solution with the point of a toothpick to the deepest part of the scratch.
NOTE: Use the minimum quantity of the clad penetrating
____ solution necessary to flow to the bottom of the scratch.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
12-25-01
ALL ú ú 01 Page 347 ú Sep 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
7) If there is a positive reaction, immediately flush the scratch with water. Do not let the clad penetrating solution stay on the scratch for more than three minutes.
NOTE: If the bottom of the scratch becomes black, then
____ the scratch penetrated the clad to the base metal.
WARNING:_______ONLY ADD ACID TO WATER. NEVER ADD WATER TO ACID OR A VIOLENT REACTION MAY OCCUR.
WARNING: DO NOT GET NITRIC ACID IN YOUR EYES, ON YOUR SKIN, OR
_______ ON YOUR CLOTHES. IF NITRIC ACID GETS IN YOUR EYES, IMMEDIATELY FLUSH YOUR EYES WITH WATER. IF NITRIC ACID GETS ON YOUR SKIN, IMMEDIATELY FLUSH YOUR SKIN WITH WATER. MAKE SURE YOU WEAR SPLASH GOGGLES OR A FACE SHIELD. MAKE SURE YOU PUT ON A RESPIRATOR AND ACID RESISTANT GOLVES WHEN YOU PREPARE THE NITRIC ACID SOLUTION.
8) Prepare the nitric acid solution as follows: a) Mix one volume of acid, O-N-350 with two to three volumes of water.
WARNING: DO NOT GET NITRIC ACID IN YOUR EYES, ON YOUR SKIN, OR
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：757 AMM 飞机维护手册 SERVICING 2(80)
