X-Plane模拟飞行论坛
标题: 【第二部】757-世界顶尖级插件机，波音认证销售 [打印本页]
作者: 挚爱的飞行 时间: 2013-6-10 12:34
标题: 【第二部】757-世界顶尖级插件机，波音认证销售
最近比较忙，还没有时间翻译，大家可以用谷歌翻译，图文并茂先了解一下。
In this second post about the 757 we're looking into the redundancy of various systems needed to navigate the plane.
I left you in the last post with a view of the IRS control panel in the overhead:
The three IRS units feed three independent computers called "symbol generators" that create the images for the EFIS screens. The left symbol generator feeds the captain side EFIS, the right symbol generator the f/o side EFIS, and the center symbol generator can be selected from either side as backup. The left IRS feeds the left and center SG, the right IRS the right SG. The center IRS can be switched to either side SG as backup.
The symbol generators are individually programmed, which means you can independently control the navigational map displays of both captain's side and f/o's side.
Remember the instrument comparator system I talked about in the last post?
It not only compares the altimeters, it also compares pitch and bank information from the IRS units.
That gives you a very useful hint in the case of an otherwise hard-to-detect type of IRS malfunction: An excessive drift, that slowly accelerates. The excessive drift is much more serious than a complete failure of an IRS unit (which you can simply detect by all information on the respective side going away and the FAULT light illuminating): you will normally not notice this until the FMC detects a gross mismatch of IRS positions. There's however a chance that not only the position drifts away but also the attitude information. In that case, the fault will be detected by the instrument comparator and announced on the PFD:
The comparator tells you there is something wrong. By comparing the outputs of the three IRS units in the overhead we can quickly tell that it is the left unit that is wrong, because C and R agree on our speed being 0 as we are on the ground while I do this exercise:
So we decide to turn off the left IRS which leaves us with the captains' side EFIS rendered pretty useless and a NO LAND3 indication that I will explain later (Of course the VSI should also display an INOP flag. I corrected this shortly after I made those screenshots):
Luckily, there exists the instrument source switching panel. So why not feed the left symbol generator from the center IRS?
That brings us back the indications on our EFIS. Also, it will have brought back another indicator that you probably didn't even notice was out of order: The f/o side RDMI. The reason is the RDMIs are cross-wired between captain's and f/o's side, so a left IRS off will cause the right RDMI to fail before you select the ALTN IRS source on the captain's side:
With the captains IRS source selector on alternate, both captain's SG and F/O's RDMI are now working. But the autoland annunciator remains in "NO LAND3". What does this instrument tell us anyway?
The autoland annunciator tells us the autoland capability of our plane.
With three IRS units working, two generators working, and all hydraulic systems working, we are triple-channel autoland capable, we are in a state that is called "fail operational". That is, an autoland is possible even in case of a failure of one channel, like an autopilot or IRS unit quitting just before touch-down.
Now with one IRS inoperative, our autoland capability goes down from "fail operational" to "fail passive". We can only conduct a two-channel autoland now, and we'll completely lose autoland capability in case another channel fails.
Besides a single IRS failure, what else can cause "fail passive" autoland capability? For example, a single generator failure. We are then also fail passive because we have only two sources of electricity (one generator and the standby DC inverter).
In that case, starting the APU would give us three independent sources again and we could upgrade to fail operational (given the three IRS and APs were working).
In case of more failures, like dual IRS failure, dual generator failure or dual hydraulic failure we lose autoland capability altogether. In that case, the autoland annunciator will very clearly tell you "NO AUTOLND"!
So whenever you realize an autopilot refuses to arm for autoland, check the autoland capability annunciator.
作者: kingcold 时间: 2013-6-11 23:22
请问这个是免费的么？还是需要购买？有链接吗？
作者: 挚爱的飞行 时间: 2013-6-12 11:02
预计这个月出，是收费的，大约60美金，绑定机器
作者: CCA1573 时间: 2013-6-12 12:46
好飞机啊
作者: CCA1573 时间: 2013-6-12 12:47
怎么没有4金币。。。
作者: 飞飞 时间: 2013-6-12 16:29
邦机器的东西asd as as
作者: ckwan 时间: 2013-7-11 09:43
VC很讚！只是得綁機器，看來兩機器同裝是不可能了。
作者: 那一年、那些年 时间: 2013-7-12 20:37
坐等，虽然我是空客党
作者: 心碎 时间: 2013-7-14 00:14
坐等销售~~~~~~~~~~~~~
作者: dongjuq12 时间: 2013-7-14 15:59
飞小机机的淡定
作者: 飞飞 时间: 2013-7-14 20:22
就xp的东西要邦东西
作者: zhe_613 时间: 2013-7-15 12:11
等的太久了，757 737C都没发售。
作者: zhouyangg27 时间: 2014-11-14 14:57
看着不错~~~~~~~~~~~~~~
作者: qqmmzzhh 时间: 2016-1-29 17:38
波音757给我的印象是：长长长长长
作者: 代购日本同 时间: 2016-7-1 21:46
看上去还不错啊！
作者: yzmxncbv 时间: 2016-8-5 17:39
等什么时候PMDG开发X-Plane机模技术成熟了，那么X-Plane就会非常流行。
作者: cowboyhe 时间: 2016-8-11 22:57
跑了跑了 漂亮
作者: cowboyhe 时间: 2016-8-11 22:59
自行车vxzcvxcv枕芯vadf啊啊士大夫
作者: cowboyhe 时间: 2016-8-11 23:01
阿斯顿发生大法是风水大师地方
作者: cowboyhe 时间: 2016-8-11 23:01
飞小机机的淡定 飞小机机的淡定飞小机机的淡定
作者: gcxf213 时间: 2016-11-27 12:03
卧槽，非常强.....
作者: Masque 时间: 2016-12-10 10:07
wo jiu shi kan tie hui tie chou gou wu ke fei bi de
作者: 234wersdf 时间: 2017-2-25 17:09
我來說下，A320電傳系統，搖桿操作與玩家體驗一致（普遍用桿子）。速度管理和保護模式最大限度避免了AAR214意外的發生！完了。
作者: 烟茶咖蜜 时间: 2017-3-11 15:19
新来乍到，各处溜达，走走看看。嘻嘻。
辛劳回复，勤奋点评，混个飞币！哈哈。
作者: royhan92 时间: 2017-4-7 20:26
看上去不错，空客党路过。。
作者: JohnCheng 时间: 2017-4-9 14:56
Filghtfactor 現在都出了version 2了
作者: littlecat 时间: 2017-5-30 13:39
这和ff的757有啥区别？
作者: Wengles 时间: 2017-6-8 02:28
这个设计真的很漂亮
作者: benjamin_di 时间: 2017-9-21 01:02
谢谢分享,谢谢分享
作者: 空客推山 时间: 2017-10-6 07:53
看起來很贊。。。圍觀
作者: sunpisces 时间: 2018-7-30 22:12
好东西，好资讯，辛苦楼主了！
作者: 钓鱼哥 时间: 2018-8-18 18:54
闪电发货过分的话换个房间号古人的福鼎白茶东方红凤凰股份的
作者: wallehu 时间: 2018-8-22 20:41
支持！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！
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