提问：A320蒙皮活门故障相关

jack.sun

请各位高手不吝赐教，谢谢大家

1、通风排气活门有两扇门，通常飞行中的中进形态是开小门。图片中此故障（排气活门）是指的大门敞开？会导致飞机释压，所以下降到FL100/MEA？
2、为什么要人工控制座舱高度和升降率呢？（外流活门不是可以正常工作吗）

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cloud1987

QUESTION: In case of the skin valve fault, if the MSA  is  above 14000ft and the reset is unsucessful,  whether flight crew can consider to reduce differential pressure and  return  to land,not fully depressuizing the airplane, in order  to aovid  using passenger oxygen masks? ANSWER: Airbus reviewed your query,  and we would  like to  provide CBJ with the following information: In the case of ECAM Alert VENT  SKIN VALVE FAULT, if the  “EXTRACT  and BLOWER…OVRD” procedures are unsuccessful,  the aircraft altitude is limited to FL100/MEA-MORA. Indeed, if at  takeoff  the EXTRACT valve fails while it is open, then the avionics  vent  ducting is vented to atmosphere  and is thus submitted to a too high  differential pressure  leading to possible duct rupture as the aircraft climbs. Thus limiting the aircraft altitude to FL100/MEA limits the differential  pressure and selecting MAN V/S  CTRL  to FULL UP position commands the full opening of the outflow valve. These actions will reduce  the differential pressure and  prevent duct  damages. Please be  informed that these actions have to be done at FL 100/MEA-MORA or below as the  actions “MODE SEL…MAN” and “MAN V/S…FULL UP” will  manually depressurize the aircraft.
There are consequences of depressurized cabin  at  14  000 ft. Therefore, if the cabin pressure cannot be maintained after double  OVRD  activation, the best  options would  be In  Flight  Turn  Back  (IFTB) or diversion. In conclusion,  the  flight crew must  follow the VENT SKIN  VALVE FAULT ECAM procedure, in case the skin air outlet  valve is affected and not recovered  with  BLOWER and EXTRACT  to OVRD. The FCOM provides information for the flight planning in case of depressurization: refer to FCOM/PRO-SPO-20/Flight without  cabin pressurization. However,  we would like  to inform  you  that  we  are  currently reviewing the possibility  to improve the  content of the current procedure.  However, please  note that  the ECAM alert  VENT SKIN VALVE FAULT is mostly triggered after  take-off  when the skin air outlet valve cannot  close,  this  is  the  reason why maximum FL100/MEA-MORA procedure line is mentioned. Additionally, our office would like to inform you that this event enters into the scope of an In Service Occurrence  that should be reported to our local Airworthiness  Authorities as per OIT 999.0066/15. In the frame of  this dedicated investigation, our office would appreciate being provided with the following information:  Date of the event,  PFR,  DFDR or DAR data,  Maintenance actions performed before & after  the  events,  Shop Finding Reports of removed  parts

来自安卓APP客户端

cloud1987

你的问题关键是这句，Please be  informed that these actions have to be done at FL 100/MEA-MORA or below as the  actions “MODE SEL…MAN” and “MAN V/S…FULL UP” will  manually depressurize the aircraft.

来自安卓APP客户端

张祖烨Neal

首先，故障针对的是进气活门和排气活门的不正常位置，进气活门是单向的，所以不影响增压，排气活门故障若超控后仍旧有缝隙，意味着有释压的风险，所以后续才会人工保持最大增压方式，尽可能的减少压力释放时间

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