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-   -   B737 unknown thing over MCP (https://www.pprune.org/tech-log/567124-b737-unknown-thing-over-mcp.html)

Manicured garden 3rd Sep 2015 17:21

B737 unknown thing over MCP
 
Hey guys, I wonder what does it do, that cube*shaped solid over MCP - attached here as a photo?
Does anyone know what is it for?

https://www.dropbox.com/s/rquu3rt3988uq28/cube.jpg?dl=0

Thanks in advance.

Dash8driver1312 3rd Sep 2015 17:30

B737 unknown thing over MCP
 
That monitors atmospheric conditions for suitability to activate chemtrail dispensing.

750XL 3rd Sep 2015 17:45

Am I correct in thinking its a reference point for pilots to adjust/align their seats?

FAR 25.773 (d) mandates installation of a 'fixed marker or other guide' in transport category aircraft to ensure that the pilots adjust their seating position such that they are positioned at the design eye reference point.

Mikehotel152 3rd Sep 2015 17:52

I thought it was an ambient light sensor for flightdeck lighting.

LEVEL600 3rd Sep 2015 18:03

Right, it is remote light sensor for CDS.

Chesty Morgan 3rd Sep 2015 19:37

Be a bit daft having it in glaring sunlight with the rest of the flight deck in shadow.

Denti 3rd Sep 2015 20:39

Guess Boeing was a bit daft then placing it there. Have to say though, display light level adjustment works a lot better on the 737 than on the bus.

Manicured garden 3rd Sep 2015 20:44

So guys still not satisfied with the answer. What I've been told is that that's for a lightning strike, to get the static load to protect MCP.

Asked the guy for the reference but couldn't show me, that's why I wanted to ask yo,u folks.
So if anyone can explain with the reference instead of opinions, I'd appreciate.

Amadis of Gaul 3rd Sep 2015 21:15


Originally Posted by Manicured garden (Post 9104789)
So guys still not satisfied with the answer.

This ain't Shop-Rite, your satisfaction is not guaranteed. Not even promised, actually.

Skyjob 3rd Sep 2015 23:37

Manicured garden - ask your engineers...
Or find a reference in maintenance manual regarding glare shield construction to be able to "see" in manuals below the screwed on (top) cover.

NSEU 3rd Sep 2015 23:45


Guess Boeing was a bit daft then placing it there. Have to say though, display light level adjustment works a lot better on the 737 than on the bus.
Automatic lighting control on the 737NG and other Boeing types involves both the glareshield sensors and the ones on the display units.

I have seen cases where the light sensors on the glareshield have been mounted backwards (maintenance error) causing the displays to go dim, even unreadable.


So guys still not satisfied with the answer. What I've been told is that that's for a lightning strike, to get the static load to protect MCP.
Did this coincide with April 1st?

http://www.iinet.net.au/[email protected]/737NG/RLS.gif

Oakape 4th Sep 2015 02:40


What I've been told is that that's for a lightning strike, to get the static load to protect MCP.
I hope he didn't really believe that & was actually having a laugh at your expense! Gave me a good laugh either way!

NSEU is correct.

Mr Good Cat 4th Sep 2015 09:13

I think it is primarily to be used an attachment for the FO to secure his GoPro3 prior to any Facebook video upload.

Although I may be wrong.

Manicured garden 6th Sep 2015 09:11

NSEU - Thanks for your serious answer & help.
Thanks a lot.

Yeelep 6th Sep 2015 12:23

Manicured garden, some references for your uninformed friend.
MMpt1 31-62-00-202CDS
MM 31-62-41
CMM 31-61-29

FullWings 6th Sep 2015 14:43

It has the dual function of light sensor and somewhere to rest the end of a clipboard. Or GoPro...

Otto Throttle 6th Sep 2015 17:03

It serves the dual purpose of preventing you putting your clipboard properly on the glare shield and in providing a nice shiny surface to ensure an annoying reflection is cunningly placed on the windshield exactly in your line of sight.

Probably made by the same people who designed the seat adjustment mechanism to ensure the right position is not quite achievable :}

EEngr 7th Sep 2015 15:04

The idea of placing a sensor in this position is to monitor the light level entering the cockpit window and control instrument illumination to track this level. So your eyes don't have to adjust too much when shifting your gaze from outside to the screens. Sensors on instruments work in conjunction with this to keep ambient light inside the cockpit from overpowering the displays.

mustang.spitfire 7th Sep 2015 16:39

Hello all and I have a question for Airbuses pilots:

Does Airbus have a similar system, please?

Thank you so much!

RVF750 10th Sep 2015 06:29

No, Airbus has a retractable table to do the job this sensor mostly does...


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