Fuel tank leak checks(AMM28-11-00-280-002) A. the cau of fuel leaks are: ---- damage of the structure ---- damage or loo fasteners ----incorrect installation of component ----damaged als, O-rings or alant B. leakage routing analysis (1).to find the fuel leak, do the applicable leak test as follow: NOTE: Only do the applicable leak test procedure(s) for the fuel tank related to the fuel leak. It will not be necessary to do the leak test procedures for all the other fuel tanks. ----(ref task 28-11-00-790-001) ----(ref task 28-11-00-790-002) ----(ref task 28-11-00-790-003) ----(ref task 28-11-00-790-004) ----(ref task 28-11-00-790-005) ----(ref task 28-11-00-790-006) ----(ref task 28-11-00-790-007) (2).the fuel leak can show a fuel leakage some distance from the source. you must monitor all the possible leakage flow direction, between the external and the internal leak points. (3).when fuel comes through a al, an O-ring or the alant the adjacent faying surface becomes a wet area. The wet area extends in all directions, until stopped at a prepacked al or a fraying surface al. the fuel comes through at the point of least resistance. C. leakage rate analysis （1pipeline）there are three types of fuel leakage. the are related to flight safety and are identified as follow: ---- light leakage a. dry the area of the leak. b. After 10 minutes there is a fuel leak indication that does not go morn than 100mm(3.94in) in any directionfeeling。 ---- heavy leakage a. dry the area of the leak. b. After 10 minutes there is a fuel leak indication that is between 100mm (3.94in) and 180mm(7.09in) in any direction.商誉减值。 ---- continuous leakage a. dry the area of the leak. | 燃油箱泄露检查(AMM28-11-00-280-002) A． 燃油泄露的原因： ----结构的损坏 ----紧固件的损坏或松动 ----部件的不正确安装 ----封圈，Ofruit形封圈，封严胶的损坏 B． 泄露路径分析 （1）.为发现泄露的燃油，进行下列相关的泄露测试： 注意：只需要对发生渗漏的油箱进行渗漏测试，无需对其他油箱进行测试。 ----（参考TASK 28-11-00-790-001） ----（参考TASK 28-11-00-790-002） ----（参考TASK 28-11-00-790-003） ----（参考TASK 28-11-00-790-004） ----（参考TASK 28-11-00-790-005） ----（参考TASK 28-11-00-790-006） ----（参考TASK 28-11-00-790-007） （2）.可见的燃油泄漏可能远离其泄漏源，你必须监控内外泄露点之间所有可能的泄露燃油流动方向， （3）.当燃油流经一个封圈.O形封圈或封严胶时，临近的接触面会变成一个湿的区域。这个湿区会朝着各个方向扩展，直到停止在一个预成型封严或接触面封严上。燃油会以一个小的阻力流过此点。 C.燃油泄露率的分析 （1）燃油泄露有三种类型。有关飞行安全及燃油泄露类型的识别如下： ----轻微渗漏 a. 擦干泄露区域 b. 经过10分钟后，泄露燃油显示痕迹在任何方向上没有超过100mm(3.94in)。 ----严重泄漏 a. 擦干泄露区域 b. 经过10分钟后，任何方向的泄露燃油显示痕迹在100mm(3.94in)与180mm(7.09in)之间。 -----呈连线形泄露 a. 擦干泄露区域 | |||||||||
b. After 10 minutes there is a fuel leak indication that is morn than 180mm(7.09in) in any direction.。 D. leakage type and location (1)the correct procedure for the leakage type and location is given in the table that follow: | b. 经过10分钟后，任何方向的泄露燃油显示痕迹超过180mm(7.09in)。 D.泄露类型和位置 (1)下列表中给出了不同泄露类型的校正程序和位置: | |||||||||
Location of leak | clustersLight leakage | Heavy leakage | Continuous leakage | 泄露位置: | 轻微 渗漏 | 严重 泄漏 | -呈连线形泄露 | |||
Open areas, where leakage cannot flow to a possible fire source: top and bottom wing surface | A | B | C | 暴露区域，泄露燃油不会流到一个可能的火源的开放区域:机翼的上下表面 | A | B | C | new york minute|||
Not fully clod areas: rear walls of tank | A | B | C | 半开区域:油箱的后壁 | A | B | C | |||
Clod areas: front walls of tank/dry bay /engine pylon location /bottom center wing -surfaces | B | C | C | 封闭区域: 油箱的前壁/干舱/发动机吊架/中央油箱下表面 | B | psper C | C | |||
Type of repair | 修理类型 | |||||||||
A | No repair is necessary. do a weekly inspection to make sure that there is no change of the leak rate. (you can do a repair if an applicable maintenance period is available). | A | 不必修理.每周检查以确信燃油泄露率没有改变.(如果具有一个可利用的维护周期，你可做一次修理) | |||||||
B | No immediate repair is necessary. do a daily inspection to make sure that there is no change of the leak rate. Do a permanent repair at the next scheduled maintenance check that occurs first. | B | 不必马上进行修理。每天检查以确信燃油泄露率没有改变。在进行下一个首先到达的计划维修时做永久修理。 | |||||||
C | Do a temporary repair immediately (before the next flight)(ref task 51-76-12-300-003). Do a permanent repair during the 500 flight hours that follow. Or at the next scheduled maintenance check if this occurs first(ref task 51-76-12-300-001)or (ref task 51-76-12-300-002). | C | 马上进行一个临时修理（在下一个航班之前）。（参考TASK 51-76-12-300- 003nbdl）。在以后500飞行小时之内或首先到达的下一个计划维修中做永久修理。 （参考TASK 51-76-12-300-001）或 （参考TASK 51-76-12-300-002）。 | |||||||
NOTE:a fuel leak from the engine aft pylon drain mast is not permitted. | 注意：发动机后吊架排放总管的渗漏是不允许的。 | |||||||||
NOTE: for more detailed fuel tank repair data, refer to the ASRM SRM 517612. | 注意：参考结构修理手册517612获取更详细的燃油箱修理数据。 | |||||||||
| 方兴未艾 | ||||||||||
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