___________
A. Terms and Definitions The table below shows some of the terms used in sealant procedures and their definitions.
-----------------------------------------------------------------------------| TERM | DEFINITION | |------------------------|----------------------------------------------------| | Application Life or | This is the period of time that a sealant remains | | Pot Life | suitable for application after it has been mixed. | |------------------------|----------------------------------------------------| | Barrier Coating | A layer of quick-drying sealant that is applied | | | over a layer of slow-drying sealant before it has | | | fully cured. This term also applies when a layer | | | of special material is put over the original | | | sealant to protect it. | |------------------------|----------------------------------------------------| | Breakable Joint | A joint that can be easily disassembled. | |------------------------|----------------------------------------------------| | Cure | This refers to the change of a sealant from its | | | original mixed condition to its final condition. | -----------------------------------------------------------------------------
-----------------------------------------------------------------------------
| TERM | DEFINITION | |------------------------|----------------------------------------------------| | Fillet | This is formed when sealant is applied into gaps | | or | or corners in the structure. The fillet or bead | | Bead | can be formed from sealant that is applied for | | | this purpose, or from the interfay sealant that | | | is squeezed out when a joint is assembled. | |------------------------|----------------------------------------------------| | Initial Cure Time | This is the minimum period of time required before | | | a sealant is cured enough to permit a sealed | | | joint to be pressure tested. | |------------------------|----------------------------------------------------| | Interfay Sealant | A layer of sealant applied to the contacting | | | (faying) surfaces of repair parts before they are | | | assembled. | |------------------------|----------------------------------------------------| | Leak Path | This is the path along which a fluid can get | | | out of, or into a sealed area. | |------------------------|----------------------------------------------------| | Overcoating | This term refers to the application of a brushing | | | thickness sealant over a joint. | |------------------------|----------------------------------------------------| | Tack Free Time | This is the period of time measured from when the | | | sealant is mixed until its surface should be | | | 'touch dry'. | |------------------------|----------------------------------------------------| | Work Life | This is the period of time within which a joint | | | that must be sealed, must be riveted, bolted or | | | temporarily fastened, after the sealant has been | | | applied to the contacting surfaces of the joint. | -----------------------------------------------------------------------------
3. Sealant Preparation
___________________
A. Mixing the Sealant
(1)
Refer to the manufacturers instructions for :
-mixing ratios,
-application life,
-tack free time,
-cure time,
-work life.
(2)
Mix the base compound and sealant accelerator slowly until you get an even consistency and color. If you mix quickly you will cause heat and air bubbles and shorten the application life of the sealant.
(3)
You must mix the sealant as close to the time of application as possible.
REPAIR OF SEALING EXCLUDING FUEL TANK - REPAIRS
_______________________________________________
TASK 51-76-11-300-001
Repair of the Sealing
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 -------------------------------------------------------------------------------
R No specific 1 BRUSH - NON METALLIC R No specific 1 SCRAPER - NON METALLIC
B. Consumable Materials
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：A320飞机维护手册 AMM STANDARD PRACTICES AND STRUCTURES(35)
