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Posted

Does anyone know what the small + signs on the panels are for?

They seem to be placed at random positions and have no obvious purpose.

My guess would be that they have something to do with brightness calibration for night vision, but that's just a guess.

 

Cheers,

Stefan

Posted

Per MIL-C-81774A and MIL-DTL-7788G.

 

MIL-DTL-7788G

3.3.3.5.1 Connector location. A white, non-illuminated cross (+) approximately 0.08

inch (2.032 mm) by 0.08 inch (2.032 mm) shall be centered and located on the front surface of

the panel approximately above the electrical connector (see figure 1). The centering and location

of the connector cross may require deviation when required nomenclature interferes with the

marking. For class 1-NVIS Green A, the white paint shall meet the NVIS radiance (NR)

requirements of MIL-L-85762 when illuminated with compatible lighting per MIL-L-85762.

 

PanelMarkings.jpg

 

 

 

They are to indicate where the electrical connector is on the back of the panel.

 

Direwolf5

Posted
Per MIL-C-81774A and MIL-DTL-7788G.

 

 

 

PanelMarkings.jpg

 

 

 

They are to indicate where the electrical connector is on the back of the panel.

 

Direwolf5

 

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Posted

Just to add a little detail. The location of the + symbols makes the spot where the faceplate has its small electrical plug that is used to supply the electrical juice for faceplate backlighting, and that's it's sole purpose in life. This is solely a faceplate thing. I have no real idea why they deemed it so important to flag it with a marker, but all military aircraft are like this that I know of.

Posted

The only thing I can think of is that the electrical connector requires some force to disconnect. So it would be wise to grip the faceplate close to the connector when pulling it off. Otherwise the faceplate might crack the panel due to bending forces.

However, this is just speculation.

 

Stefan

Posted

Probably so that if the panel won't light up the pilot knows where to smack the panel to try to get it to light up.. ;)

 

I was a Minuteman Missile tech :geek: in the Air Force back in the 80's, and we were taught several escalating "Maintenance Procedures" to get a stubborn system to work:

 

Maintenance Procedure 1; Smack center of panel with rubber mallet several times. If function does not return proceed to next procedure.

 

Maintenance Procedure 2; Unlock equipment drawer handles and slide unit halfway out, then slam it back in twice. If function does not return proceed to next procedure.

 

Maintenance Procedure 3; Remove drawer, lift above your head and then drop on floor. re-insert drawer and see if function has returned. If function does not return proceed to next procedure.

 

Maintenance Procedure 4; Call base on radio and have a replacement drawer choppered out.

 

I swear to god that this is true, the first time my team Sargent took a $600,000.00 computer memory drawer out of the rack and threw in on the floor I liked to have had a heart attack, :surprise: :shocking: because they told us if we destroyed a piece of equipment we had to buy it.

 

We later found out that they could only take 2 months pay from you, when one of the guys destroyed a security system drawer that was worth a couple of million, it had 216 pounds of gold connectors and wires in it.

Posted
Just to add a little detail. The location of the + symbols makes the spot where the faceplate has its small electrical plug that is used to supply the electrical juice for faceplate backlighting, and that's it's sole purpose in life. This is solely a faceplate thing. I have no real idea why they deemed it so important to flag it with a marker, but all military aircraft are like this that I know of.

 

Not that I have ever flown an A-10 but I have flown a few versions of the Boeing 737 and on that aircraft pressing the white cross was the means by which you could restore the panel backlighting, if it had failed or was intermittent.

Don't ask me how it worked but it did. :D

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Posted
Not that I have ever flown an A-10 but I have flown a few versions of the Boeing 737 and on that aircraft pressing the white cross was the means by which you could restore the panel backlighting, if it had failed or was intermittent.

Don't ask me how it worked but it did. :D

 

I spent 18 years in aircraft maintenance and we use to do the same thing to fix them. Sometimes the panel was not sitting flush and just pushing on it was enough to make the connection better.

Airdog

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Posted
Not that I have ever flown an A-10 but I have flown a few versions of the Boeing 737 and on that aircraft pressing the white cross was the means by which you could restore the panel backlighting, if it had failed or was intermittent.

Don't ask me how it worked but it did. :D

 

 

What Airdog said was true. We will often do the same thing with the backside of a screw driver or some other type of non-blunt object. The connections tend to build corrosion and panels also tend to warp a little. The connectors usually don't look any different than an RCA jack, just smaller. They are just simple connections with no locking feature other than the forces of the mounting screws for the faceplate holding them togeather. Boeing builds our crap too! :)

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