当前位置:首页 >> 其它课程 >> Maintenance Practice

Maintenance Practice


Maintenance Practices
1. General
These maintenance practices tell you about composite repair processes and how to repair Class 2, 3 and 4 damage to the composite structure. Refer to

Section 51-10 for data about damage classification. Class 1 damage may only be repaired in accordance with a repair scheme approved by the manufacturer. All repairs must be carried out by approved persons. You must only use the materials approved by the manufacturer when repairing the airplane. Refer to Section 51-30 for data about approved materials. Inspect the damaged area. Look specially at the adjacent structure. Damage can go a long way under the surface. Use the techni ques given in Section 51-10. You must take care to do the repair correctly. The outer shell of a composite structure is stressed. Failure of the structure can cause an accident.

2. Resin
You must use the correct quantity of mixed resin for the repair. Weigh all the cut cloth patches that you will use for the repair. The ratio for glass cloth to mixed resin is 100 : 70. For example, 100 grams of dry glass cloth require 70 grams of mixed resin. The ratio for carbon cloth to mixed resin is 100 : 85. For example, 100 grams of dry carbon cl oth require 85 grams of mixed resin. Measure the quantities of resin and hardener accurate ly (± 0.5 % by weight). Mix the resin and hardener thoroughly before laminating, or adding fillers or other additives. Always use clean containers for mixing resin and only mix as much resin as you can use within its “working life”. When using a large quantity of resin put it into a shallow container. This will increase the ratio of surface area to volume which will reduce the risk of an exothermic reaction. For parts made from self extinguishing resin use the same resin system for repair (refer to Section 51-30).

3. Glass and Carbon Cloth

%

You must always use the correct cloth for the repair. Refer to the lay-up drawing of the repair area for

data about the type of cloths you must use. The lay-up drawing will tell you: ) The correct type of cloth. ) The fiber direction. ) The dimensions of the layer. Make sure that the fibers in each layer of cloth point in the direction given in the lay-up drawing. This gives the correct strength to the laminate. Only use sharp shears or scissors to cut the cloth to size. Make sure that the fibers in the cut cloth point in the correct relative direction. Make sure that the fiber strands are not broken or damaged. The cloth mu st be free of any damage or contamination.

4. Core Material
You must always use the correct sandwich core for the repair. Refer to the lay-up drawing of the repair area for data about the type of core you must use. Make sure that the core material is not damaged or contaminated. Use a sharp knife to cut the core to the exact size for the repair. The edges of the cut must be clean so that the core will bond correctly. You can profile the core by cutting or sanding.

5. Laminating
A prescribed stack of resin impregnated cloth makes a laminate. A laminate which is used to repair an airplane becomes an integral part of the airpl ane structure once the laminate is hardened and fully cured. You can make the laminate in place directly on the repair or you can make the laminate on a work table and then apply the wet laminate to the repai r. When you make the laminate on a table: ) It is easier to do. ) It is easier to control and correct the laminating process. ) You can make sure that the cloth layers in the stack are correct bef ore you apply the resin. ) You can make the repair neater. ) You do not have to work upside down.

B. Laminating on a Table


更多相关文档:

HPLC Maintenance Procedure

Purpose A procedure to standardize the preventive maintenance practice for HPLC systems. 2. Scope and Applicability This procedure applies to the Global ...

CGMP--Current Good Manufacturing Practice(中英文对照版)

CGMP--Current Good Manufacturing Practice(中英文对照版)_医药卫生_专业资料。...(7) 保留保养、清洁、消 (7) Records shall be kept of maintenance, 180 ...

Practice_Revision_questions

practice_set 6页 1财富值如要投诉违规内容,请到百度文库投诉中心;如要提出...reduce the loan balance and the maintenance of a debt-to-value ratio B....

practice 6专四练习

, much can be learned from the systematic study of professional practice. ...maintenance for burial sites or lose them), 所以 B 正确; 法律禁止妇女婚后...

practise

practice 耕作方法 job practice 施工方法 judicial practice 司法程序, 判例 laboratory practice 实验室实习 land practice 陆上练习 maintenance practice 保养程序 ...

To carry out preventative and corrective maintenance

To carry out preventative and corrective maintenance_其它考试_资格考试/认证_...‘standard plate count test’ to comply with latest Code of Practice on ...

MidtermPractice2016

MidtermPractice2016_英语学习_外语学习_教育专区。University of Washington ...C) The salary of a maintenance supervisor in a multiproduct manufacturing ...

Motherboard Troubleshooting maintenance methods

motherboard troubleshooting maintenance methodsmotherboard troubleshooting maintenance...to replace the suspect parts, this method is applied in practice a lot. ...

美国电池标准(ANSI battery standards)

Practice for Sizing Lead-Acid Batteries for Stand-Alone Photovoltaic (PV) Systems Recommended Practice for Installation, Maintenance, Testing, and Replacement ...

英翻中

On the contrary, a Japanese study concluded thatfundamental modifications are not required to practice winter maintenance in PA surfaces, sinceconsiderable ...
更多相关标签:
maintenance | high maintenance | maintenance margin | maintenance 缩写 | se网站 maintenance | capital maintenance | high maintenance美剧 | server maintenance |
网站地图

文档资料共享网 nexoncn.com copyright ©right 2010-2020。
文档资料共享网内容来自网络,如有侵犯请联系客服。email:zhit325@126.com