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White Light/Button On 777 Autopilot Panel  
User currently offlineAirForceOne From Canada, joined Aug 2006, 61 posts, RR: 0
Posted (11 months 2 weeks 6 days 6 hours ago) and read 3606 times:

Hello, I notice in the cockpit of the 777 there is white button/light located on the autopilot panel between the LNAV button and the HDG selector display. Im wondering what is its purpose/function?
Thanks

10 replies: All unread, jump to last
 
User currently offlineN243NW From United States of America, joined Jul 2003, 1638 posts, RR: 20
Reply 1, posted (11 months 2 weeks 6 days 5 hours ago) and read 3587 times:

According to this website:

http://www.meriweather.com/flightdeck/777/glare/mode.html#

"Cabin Light Sensor - This sensor checks the ambient light in the cockpit then adjusts all of the cabin display lights accordingly."



B-52s don't take off. They scare the ground away.
User currently offlineAirForceOne From Canada, joined Aug 2006, 61 posts, RR: 0
Reply 2, posted (11 months 2 weeks 5 days 10 hours ago) and read 3352 times:

Thank you for showing me the website. I was looking for something like this.

User currently offlineNatflyer From United States of America, joined Oct 2013, 160 posts, RR: 1
Reply 3, posted (11 months 2 weeks 5 days 6 hours ago) and read 3257 times:

Quoting N243NW (Reply 1):

"Cabin" light sensor? On the MCP? adjusting "cabin" lights?

I'll believe it when a 777 pilot confirms. Until in my mind it has to do with cockpit/lighting/displays.


User currently offlineN243NW From United States of America, joined Jul 2003, 1638 posts, RR: 20
Reply 4, posted (11 months 2 weeks 5 days 4 hours ago) and read 3215 times:

Quoting Natflyer (Reply 3):
"Cabin" light sensor? On the MCP? adjusting "cabin" lights?

I think it was an error in translation. It is indeed for the flight deck lighting, not the passenger cabin. If the manual brightness control knobs for most instruments/panels are placed in the center position (indicated by a dot), a MASTER BRIGHTNESS knob will work in conjunction with the ambient light sensor to adjust almost all panels and displays.



B-52s don't take off. They scare the ground away.
User currently offlineLTC8K6 From United States of America, joined Jun 2009, 1210 posts, RR: 0
Reply 5, posted (11 months 2 weeks 5 days 4 hours ago) and read 3208 times:

It's an ambient light sensor.

User currently offlineqantas744er From United States of America, joined Jun 2005, 1289 posts, RR: 4
Reply 6, posted (11 months 2 weeks 2 days 10 hours ago) and read 2697 times:

Straight from the B777 FCOM2

"Two remote light sensors, located left and right on the top of the glareshield, measure brightness in the forward field of view and adjust the overall display brightness as required. Individual sensors on the front of each display unit also affect display brightness. The CDUs, mode control panel displays, standby flight instruments, and aisle stand panel displays are also controlled by the automatic display brightness control system."


The light sensor you are referring to on the MCP (mode control panel) automatically adjusts the brightness of the various LCD windows on the MCP.



Happiness is V1 in Lagos
User currently offlineAA737-823 From United States of America, joined Mar 2000, 5873 posts, RR: 11
Reply 7, posted (11 months 2 weeks 2 days 1 hour ago) and read 2582 times:

Quoting Natflyer (Reply 3):
"Cabin" light sensor? On the MCP? adjusting "cabin" lights?
Quoting N243NW (Reply 4):
It is indeed for the flight deck lighting, not the passenger cabin.

Everyone seems to be nit picking... fact of the matter is, "cockpit" is an antiquated term, and Boeing most often uses "Control CABIN."

So yes, it's adjusting some of the lighting in the CABIN in which it's located.

Other models feature similar sensors spread throughout the control cabin. On the 737NG, for example, each DU has its own independent sensor. You can shine a flashlight at it and watch the display brighten.


User currently offlineAirForceOne From Canada, joined Aug 2006, 61 posts, RR: 0
Reply 8, posted (11 months 2 weeks 2 days 1 hour ago) and read 2577 times:

This is pretty cool. I didn't know other planes had it. On the 737 I always though pilots themselves adjusted it.

User currently offlinewilco737 From Greenland, joined Jun 2004, 9077 posts, RR: 76
Reply 9, posted (11 months 2 weeks 1 day 19 hours ago) and read 2479 times:
AIRLINERS.NET CREW
HEAD MODERATOR

Quoting AirForceOne (Reply 8):
This is pretty cool. I didn't know other planes had it. On the 737 I always though pilots themselves adjusted it.

I just realised that the 747-8i has it as well. Never actually recognized it, until I saw this thread and was on board a 747-8i tonight 

You basically don't need to touch the brightness controls for the screens anymore. They are adjusted automatically.

wilco737
  



It it's not Boeing, I am not going.
User currently offline7BOEING7 From United States of America, joined Oct 2012, 1634 posts, RR: 8
Reply 10, posted (11 months 2 weeks 1 day 10 hours ago) and read 2329 times:

Quoting AA737-823 (Reply 7):
Everyone seems to be nit picking... fact of the matter is, "cockpit" is an antiquated term, and Boeing most often uses "Control CABIN."


Don't know about that, all their ops manuals and panels say "Flight Deck".


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