Hi I.am flying the PMDG 737 NG on FS2004 for several weeks now but I notice there is system fault on the blue "RAM DOOR FULL OPEN" light,s on the FWD overhead panel, when I switch on the a "PACK" switch to AUTO or HIGH the blue light is working correctly on ground as is air with flaps not up, but when I switch the PACK switch(s) to "OFF" the blue "RAM DOOR FULL OPEN" light(s) also goes off and that's not correct. I now this because I work as B737 PG & NG airplane mechanic.I can tell you that this light only illuminate's when the airplane is on the ground & when the airplane is in the air with flaps not up. You can never switch off this light with the "PACK" switch(s) is set to "OFF".Greetings. The B737 NG Mechanic.

"...when I switch the PACK switch(s) to "OFF" the blue "RAM DOOR FULL OPEN" light(s) also goes off and that's not correct."Hi, ???? (Please insert real name here)Is this applicable to all phases of flight? E.g. On ground, In-Air with Flaps Extended and In Air with Flaps Retracted?According to the Boeing Maintenance Manual, "21-50-00", if the pack is shut down in flight, the ram air modulation panels fair (close) to decrease drag."Loss of power may also cause fairing. I've noticed that on a dead ship sitting on the tarmac, you will sometimes see the doors moving towards closed (you can see the deflector doors closed). Picture available on request.Cheers.Ian.

Hi Ian. My name is Mark.The "RAM DOOR FULL OPEN" light is on the ground always illuminated you can not turn this light off on the ground. And in the air with the flaps not up this light is also illuminatedbut when the flaps are fully retracted the light goes off, But when this light comes "ON" in flight is this a sign that the related pack starting the get overheated and the RAM door is modulating to open to get more cool air in side the pack to cool down and when the pack is cooled enough the RAM door is modulating to closed but never completely to closed it's always modulating during flight, and this is undependend in what position the PACK switch is.Greetings Mark.

"and this is independent of what position the PACK switch is in."Thanks, Mark.I think I understand all that you've said, but I don't understand why one airline's Boeing NG Maintenance manual says that the door "fairs" when the pack is shut down in flight. I checked another airline's NG Maintenance Manual, and it didn't have this statement. Both airline's wiring schematics seem to agree with what you've said. Interestingly, however, there appears to be a pack valve OPEN/CLOSE relay in the Ram Air Door Controller circuit. If you have the Boeing schematics handy, please refer to K7 in diagram 21-51-14. However, in my diagrams, the relay doesn't appear to have any function. Perhaps it's an option of some kind?Anyway, I tend to agree with you. Perhaps we can have this changed. I'll ask Mr Randazzo (after he gets married and comes back from his honeymoon ;-))Cheers.Ian.(Maintenance Engineer for (almost) 30 years... but relatively new to the NG)Or as some would say it...747-100, 747-200, 747-300, 747-400, 747-400F, 767-200, 767-300, DC10, DC4, HS125, B707-300, paper airplanes, Lotus cars....

--Interestingly, however, there appears to be a pack valve OPEN/CLOSE relay in the Ram Air Door Controller circuit. If you have the Boeing schematics handy, please refer to K7 in diagram 21-51-14. However, in my diagrams, the relay doesn't appear to have any function. Perhaps it's an option of some kind?---Hi Ian.I have checked the boeing trainings manual and Schematic diagrams of the B737-NG the PACK VALVE CLOSED relay K7 has one function, when your performing a BITE test on the pack/zone controller it energizes relay K15 this simulates a ground position regardless of flap position. I quoted from the Boeings tranings manual 21-50-00 Your PACK switch should be position to "OFF" when you are performing a BITE test. I hope this answers your question.Greeting Mark.

"it energizes relay K15 this simulates a ground position regardless of flap position."Thanks, Mark! Handy information.Cheers.Ian.