you see I'd know a lot more about this plane if AoA would start releasing more videos!

Ya know flipping through the FCOM may not be as fun as watching a video but it works just the same. I figured out the first answers to Q6 & 7 by simply finding the Air Controls and Indicators section in the FCOMv2 and reading. Pages 120-128.

Answers to questions 8 & 9.8. Open. (AUTO opens isolation valve automatically if either engine BLEED air or air conditioning PACK switch positioned OFF.)9. The temp inside the right pack is greater than limits. (indicates pack trip off or failure of both primary and standby pack controls)This next pic shows the systems which use bleed air.@ Andrea.I understand what you are saying about question 7.I will check it out.Thanks for the interesting [email protected] the latest CBT but has been updated to include the HUGS.Fred.

Thanks for the interesting diagrams.

Thank you for this interesting topic, waiting for other questions ;-)

Questions 10 & 11.( Equipment Cooling is one of the easiest systems to understand. I will be posting some good pics with the answers )

10 The normal exhaust fan does not operate11 The normal supply fan does not operate

10 The normal exhaust fan does not operate11 The normal supply fan does not operate

That's what I'd also say

Yes, please pin this thread!

Very interesting indeed !

10 The normal exhaust fan does not operate11 The normal supply fan does not operate

+1

Nice thing the equipment cooling...Description:The system is composed of 2 subsystems, one supply system that will blow fresh air to the back of the panels, to the displays, to the breakers and so on, and the exhaust system wich removes (like a vacuum cleaner) the hot air discharging it where required.The supply system have 2 fans, checkvalves to prevent a backflow, and a filter, the air is blown behind pilot panels, pedestal, overhead and circuit breakers panel and to the equipments in the avionics bay. From the cockpit the fan is not too loud, and switching from normal to alternate you can hear the checkvalve closing.The exhaust system is the most loud one, not for its operation but for the exhaust. And the exhaust is the particular thing of this system.Exhaust air is warm air, on ground when airplane is unpressurized, the air is discharged overboard, this makes a lot of noise.When the aircraft is pressurizing, the speed of the air discharged increases, a lillte flap valve with an aerodinamic shape at a certain speed will close the overboard valve and the air is no more discharged outside.The air will flow under the forward cargo floor.Why?First because we don't want to lose pressurized air, second because heat generated can be re-used to warm the cargo compartment.It is not a case that live animals can be carried only on the forward cargo.On the NG planes, there is a smoke removal actuator that will bypass the aerodinamically operated valve in case of smoke presence.Now, the sensors:To inform pilots about the correct air flow inside the systems, 2 sensors are mounted in the main supply and exhaust ducts.These sensors are able to detect the flow in a simple way... they are heated probes with a temperature switch.When the air passes around the probe, the temperature of the probe decreases as the air cools it, when the airflow decreases or stops, the probe will heat more, until the temperature switch inside it will close and this will trigger the relative OFF light on the panel.So, the Off light will not mean that the system is off, it means that airflow is insufficient to cool the systems.One of the most important things that needs to be cooled are the IRS (ADIRU), so, if for more than 20 seconds the OFF light is lighted (on ground) the aircraft will start to sound with the ground crew horn, the same horn used by pilots to call mechanics, the same horn that plays when the IRU are on DC power only (on ground).This big hole is the overboard exhaust.Just for info, when doing maintenance te exaust flow can be very loud, it is often used a silencer connected to it to eliminate most of the generated noise.In the picture above you can see a silencer, a self made one.In the picture below supply and exaust ducts are pretty visible if you remove all the pilot panels :D

Looks like the maintenance tech is bent over praying :- " I hope i can figure out how to put this all back together again" !!

Answers to questions 10 & 11.10. The normal exhaust fan does not operate.11. The normal supply fan does not operate. ( FCOM Vol 2 page 129 )Great pics Andrea !!These few pics sum it up nicely.

Please don´t post any more pics of the flight deck like that. It hurts.

Please don´t post any more pics of the flight deck like that. It hurts.

If you can get be comforted, the aircraft in the picture is a 737-400, not an NG one :DFrom the lot of works I did on the aircrafts, one of the worst one is to remove those panels and ten reinstall them.I'm a bit bigger than the one in the picture, and we did this work for forward bulkhead inspection.Removing the panels is not big problem, the problem is when you remove the EFIS shelves, there is no space to put hands, no space for the keys, and the control column is one of the things (with the landing gear lever) that increase the difficult level.And, the difficult is not the removal phase... but the next re-installation :(

Aircraft technical manual also says that if you cannot access to all things, you can remove the control columns, but, doing tat will need rig, checks, and a lot of more work... Whatching at the times needed to do that and a bit of stress but less work, my choice is the last one! :DWhile we are waiting for RYR738 next question and answers, I use the last schemes He posted to ask you:In the RYR738 schemes, can you find if the aircraft is on ground or inflight?A ) Yes, the aircraft is on a normal ground condition*B ) No, there is no mode to know if aircraft is on ground or in air in a normal condition*C ) Yes, the fans are running in normal mode so the aircraft is flyingD ) Yes, the aircraft is inflight as the overboard valve is closed in normal flight condition** Normal condition indicates the normal panels (overhead, pedestal, main) configuration for ground (ready to taxi) or flight (cruise for example) configuration.