SR  HNA-HNA-24-0410-01C

2024年2月有飞机导航灯罩在外站破损，特与厂家做了放行方案的沟通，厂家表示可以金属胶带整形后放行，禁用该灯。

However, if Hainan Airlines Holding (HNA) is not able to complete the replacement of the wing position light lens before the airplane is dispatched and this would cause a delay, then Boeing suggests the following for this particular case:

a) Apply at least 2 layers of high-speed tape onto the entire cover with 50% overlap.

b) Trim the speed tape as required to obtain a smooth surface.

c) The light must be deactivated by opening the relevant circuit breaker and limited to daylight operation only.

d) Apply MEL 33-11 for daylight operations. The airplane must operate during daylight hours (sunrise to sunset).

e) Inspect the temporary repair prior to each flight to ensure that there is no further damage to the lens/aluminum speed tape and that there is no moisture ingress into the lens.

f) Boeing recommends replacing with a new lens at the earliest opportunity when the part is available or before 5 Flight Cycles. Continued use of the speed tape could allow water ingression and damage to the light assembly.

大气数据惯性基准系统（ADIRS）用于向机组提供飞机姿态、高度、空速、温度、航向以及当前位置信息等，核心部件是ADIRU，它有两个主要功能：大气数据基准（ADR）和惯性导航基准（IR）。ADIRU 内部有 3 个激光陀螺，属于精密仪器，用于计算惯性导航基准数据，感知飞机围绕 X、Y 和 Z 轴的俯仰、横滚和偏航信息。X/Y/Z轴每轴各有一个加速度计，测量该轴轴向的加速度值。从部件失效统计看，陀螺故障大约占比为66%，陀螺为激光陀螺，长时间使用会出现磨损，当超出一定容限表现为ADIRU故障。基于MTBF提出使用全新陀螺、限定10000FH以上二手陀螺等措施。

因详细可靠性调查类，机队数据涉及公司商密，请使用公司主管以上人员邮箱，向HNATJSTD@HNAIR.COM索取。