谁知道惯导漂移有何驾驶舱效应？

zxliu2007 · 发表于 2013-4-3 10:56:39

主要是想知道机组如何得知惯导漂移了？ECAM有警告？还是PFD、nD上有信息？MCDU上有信息？
请权威人士解答。
翻了下机组操作手册，里面有要求落地后看DATA页的惯导漂移量，但这个不是每个机组都执行的，有没有驾驶舱效应提醒机组。

saltegg · 发表于 2013-4-3 14:05:44

查了下手册看了，貌似是没有的，只能等一段飞完，通过ADIRU性能标准进行测试，应该有两种测试方法：
-    the radial position error (in NM)

-    the residual ground speed error (in kts).

各有不同的测试方法，如下：
Radial position error

In order to address the statistical term of this requirement with the most relevant approximation, the removal criteria use a limit based on the recording of the radial position error on two consecutive flights.
The use of a two-strike method presents the advantage to decrease the removal rate of healthy units that have shown, by chance, or by an inaccurate position entry at alignment, a radial position error beyond the specified criterion.
The removal boundaries described on the figure present three different areas:

-    Area 1 - ADIRU OK all the time

-    Area 2 - ADIRU to be checked after second flight

-    Area 3 - ADIRU to be replaced.

NOTE: Area 2 is applicable when the residual radial position error ranges within the limits described in following Para.

(a) Lower limit for removal criteria

The integration of the  drift  rate results in a lower limit for the radial position error:
Radial position error (NM) = (2 (NM/h) * T (h)) + Offset (NM)
The presence of an offset is necessary to avoid the unjustified removal of healthy units subject to the natural Schuler effects and to the Present Position inaccuracies entered during initialization.
It should be pointed out that the adverse impacts of such inaccuracies over the radial position error will reveal stronger for short flight durations (below 1.5 hour).
-    Flight duration < 1.5 FH:
The lower limit of the grey band is fixed at 5 NM.

-    1.5 FH < Flight duration < 10 FH:
The lower limit of the grey band is fixed at 2T + 2.

-    Flight duration > 10 FH:
The lower limit of the grey band is fixed at 22 NM.

(b) Upper limit for removal criteria

-    Flight duration < 1.5 FH:
The upper limit of the grey band is fixed at 7.5 NM.

-    1.5 FH < Flight duration < 10 FH:
The upper limit of the grey band is fixed at 3T + 3.

-    Flight duration > 10 FH:
The upper limit of the grey band is fixed at 33 NM.

(3) Residual Ground Speed Error

The residual ground speed for each IR is determined at the end of the flight when the aircraft has come to a complete stop.
(a) Check of the residual ground speed can be made:

-    On the CAPT (IR1) and F/O (IR2) Navigation Displays (ND):
The residual ground speed of the IR3 can be read on the CAPT ND by setting the ATT HDG selector switch to CAPT/3.

-    On the ADIRS CDU:
. set the DATA DISPLAY selector switch to TK/GS
. set the SYS DISPLAY selector switch to 1, 2, 3
. read the respective ground speed in the CDU display.

(b) Compare the recorded ground speed values with the following limits:

-    if the residual ground speed error is 15 kts or greater after each of two consecutive flights, replace the ADIRU

-    if the residual ground speed error is 21 kts or greater at the end of any one flight, replace the ADIRU

基本大概意思就是如果做了这个测试，滑移率在1位置说明没问题，2位置需要进一步检查，3位置就说明ADIRU不行了要更换了
也不知道自己找的对不对，哪位高人给来看看