部件气动外形封胶与飞机放行

jlhuang_05 · 发表于 2020-11-22 20:26:01

收集关于封胶能否保留，封胶未干能否贴金属胶的相关手册。欢迎大家提供更多资料，有新的我会随时更新。

1
可以贴金属胶放行的封胶

更换窗或者修复破损的胶时，由于密封胶的固化时间比较长，如果飞机停场时间不充裕，可以贴金属胶飞行。注意每个航段检查金属胶情况。

驾驶舱1号、3号以及4、5号窗，参考AMM 56-11-11/21/31，驾驶舱2号窗参考AMM56-12-11，如密封胶没有完全固化，可以在密封胶上贴铝箔金属胶带放行飞机。手册具体章节可以通过搜索关键词G00291在AMM56章找。

2
可以延期封胶的部件

更换MB、RA、TCAS、ATC、DME、ADF和GPS等天线，参考AMM34章和SL 20-043，如果对部件封胶会导致航班延误，可以执行航班后再封胶，天线周围不允许贴金属胶带。手册具体章节可通过搜索关键词SL 20-043在AMM34章查找。

AMM34

部件气动外形封胶与飞机放行-2.jpg

SL 20-043 (链接：https://pan.baidu.com/s/1NkE3OZw1UTUfuwyY-9lpZA 提取码：6666)

3
不能延期封胶的部件

对于水平安定面前缘或者机翼的封胶，飞机在封胶前不能执行航班。经咨询波音，原因大致如下。

封胶用来填充结构和蒙皮之间的缝隙，保持气动外形平滑，以提高飞机性能。机翼和水平安定面前缘属于关键区域，没有填充的缝隙可能会结冰，冰块脱落有可能对其他部件造成损伤。如果要保留放行，只能按个例报波音，而且还有一定的条件，以消除提到的风险。

The purpose of sealant application on leading edge skin of wing or stabilizer is to:

1. Fill the gap btw the skin and other structures.

2. Maintain the aerodynamic smoothness requirements - The 737 airplane must have an aerodynamically clean shape and a smooth external surface to give high performance. It is important to keep the initial contour and smoothness of the external surfaces of the airplane.

According to SRM 51-10-01, Leading Edge of Wing and Stabilizer has been identified as the Extra Critical Area – extra high level of Aerodynamic Smoothness is necessary for these areas.

Besides, the unfilled gap btw the leading edge skin and other structures could cause ice to accumulate. This will further change the wing or stabilizer contour to reduce the airplane performance or result in spanmature stalling. The accumulated ice may also depart from the airplane and further damage other structures.

Our database also indicates several special approvals for the deferment of sealant application. But those are on case-by-case basis and will require additional procedure to avoid the risk mentioned above.