近期有运行中反映停留刹车灯不亮，但在备用灯泡盒中没有找到对应的新构型灯泡的案例，特做相关说明。停留刹车灯有两种构型：
1，传统的1864
2，新构型的MS25237-327AS15
新构型灯仅在这个位置使用，该灯泡实际上在备用灯泡盒也有采用，只不过件号是MS25237-327，而后缀AS15代表灯泡亮度增强15%。
备用灯泡盒中的停留刹车灯
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月度归档： 2021 年 11 月
电子舱门空中解锁并导致异响
2021年11月，有飞机落地检查前电子舱门手柄弹出，询问机组起飞5100米机头下方听到一声响，增压无异常，手柄推到底要人工按一下按钮才能完全锁定，目前能关上，锁定后敲击检查无异常，检查门和门框区域结构正常，粘贴金属胶带放行。
检查发现安装销孔基座存在裂纹，导致在振动情况下掉落。波音给出50CY的NTO.
关于冻雨气象下后缘襟翼连杆机构损伤
冻雨气象下后缘襟翼连杆机构损伤，是波音承认的一个普遍问题，机队在2016年一天内连续发生过4起，而后几年未有案例报告，但在冬季航材储备和冬季运行指南中一直有相关说明，2021年机队再次在一天内发生3起，基于各方高度关注，特对原因和政策做相关说明。
关于冻雨气象下双组件跳开的事件分析
2021年11月，机队出现了一从冻雨气象条件机场起飞后左右组件均跳开的事件，空中复位成功，落地后检查组件性能良好，左右冲压系统工作正常，结合该机同时出现了后缘襟翼下襟翼连杆拉断的案例，分析该机是冲压进气折流门出现了结冰影响了冲压气量所致。
折流门主要依靠弹簧收起的视频如下。
关于起飞阶段跳出ENGINE OUT CLIMB页面的问题汇总
SR 4-5065781821
Q1: What is meaning of the ENGINE OUT CLIMB page?
R1: The CLB page is one of three pages which are dedicated to the display of performance information specific to a particular phase of flight. This page can be displayed regardless of the selected speed mode used for the climb phase. The six climb modes consist of: ECON, MAX RATE, MAX ANGLE, ENG OUT, RTA and selected speed mode. During engine out climb (ENG OUT CLB) conditions, the FMCS displays the maximum altitude capability and optimum airspeed based on maximum continuous thrust, engine out climb speed and current gross weight. The ENG OUT mode is advisory only and cannot be coupled to the Digital Flight Control System (DFCS). ECON is the default mode, but the others are selected from CLB page prompts or by manual entry of a speed schedule.
Q2: Whether ENGINE OUT CLIMB page is caused by the EEC internal fault?
R2: The FMC will detect an engine out condition using a bit from the FCC (or the auto-throttle (A/T) computer if installed). If the EEC fails such that it appears to the A/T there is an engine out condition, then the ENGINE OUT CLIMB page could display.
The FMC determines engine out by monitoring the engine running bits. The EEC will set these bits to “Engine On” at 50% or greater N2. These bits are set to indicate “Engine Off” at less than 50% N2, or when the left and right TLA differ by more than 52 degrees.
Q3: Which faults or messages can cause ENGINE OUT CLIMB page to show?
R3: ENG OUT CLB and ENG OUT CRZ advisory pages are provided by the FMC. Engine-out advisory information is available at the press of a button on the CDU throughout the flight.
Again, the FMCS displays the maximum altitude capability and optimum airspeed based on maximum continuous thrust, minimum drag speed, and current gross weight during engine out climb (ENG OUT CLB) conditions. VNAV cannot be engaged when ENG OUT modes are active. Revisions to the planned cruising altitude (CRZ ALT) due to re-clearance or operational economy may be entered on this page.
Based on the provided information, we suppose that EEC internal fault caused the reported issue.
Q4: Whether we can dispatch the plane under this condition?
R4: If the only fault received was 73-20022 INTERNAL EEC FAULT, then can dispatch the airplane under the short time dispatch conditions.