airforceone
Posts: 53
Joined: Thu Aug 24, 2006 9:47 am

White Light/Button On 777 Autopilot Panel

Fri Nov 08, 2013 3:56 am

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
 
N243NW
Posts: 1597
Joined: Thu Jul 24, 2003 4:29 am

RE: White Light/Button On 777 Autopilot Panel

Fri Nov 08, 2013 4:17 am

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.
 
airforceone
Posts: 53
Joined: Thu Aug 24, 2006 9:47 am

RE: White Light/Button On 777 Autopilot Panel

Fri Nov 08, 2013 11:11 pm

Thank you for showing me the website. I was looking for something like this.
 
Natflyer
Posts: 352
Joined: Fri Oct 11, 2013 9:29 pm

RE: White Light/Button On 777 Autopilot Panel

Sat Nov 09, 2013 3:29 am

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.
 
N243NW
Posts: 1597
Joined: Thu Jul 24, 2003 4:29 am

RE: White Light/Button On 777 Autopilot Panel

Sat Nov 09, 2013 5:21 am

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.
 
LTC8K6
Posts: 1444
Joined: Fri Jun 05, 2009 8:36 pm

RE: White Light/Button On 777 Autopilot Panel

Sat Nov 09, 2013 5:33 am

It's an ambient light sensor.
 
Qantas744er
Posts: 1150
Joined: Sat Jun 04, 2005 4:36 am

RE: White Light/Button On 777 Autopilot Panel

Mon Nov 11, 2013 11:50 pm

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
 
AA737-823
Posts: 4888
Joined: Wed Mar 01, 2000 11:10 am

RE: White Light/Button On 777 Autopilot Panel

Tue Nov 12, 2013 8:11 am

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.
 
airforceone
Posts: 53
Joined: Thu Aug 24, 2006 9:47 am

RE: White Light/Button On 777 Autopilot Panel

Tue Nov 12, 2013 8:38 am

This is pretty cool. I didn't know other planes had it. On the 737 I always though pilots themselves adjusted it.
 
wilco737
Posts: 7279
Joined: Sun Jun 20, 2004 12:21 am

RE: White Light/Button On 777 Autopilot Panel

Tue Nov 12, 2013 2:33 pm

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
  
 
User avatar
7BOEING7
Posts: 2333
Joined: Fri Oct 12, 2012 5:28 pm

RE: White Light/Button On 777 Autopilot Panel

Tue Nov 12, 2013 11:02 pm

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".

Who is online

Users browsing this forum: Google Adsense [Bot] and 9 guests