Buzz From United States of America, joined Nov 1999, 697 posts, RR: 23 Reply 1, posted (11 years 7 months 3 weeks 6 days 4 hours ago) and read 3510 times:
Hi Mb339, Buzz here. I haven't used that Ram air button either. but it opens up an airscoop near the LH air cond pack ram air inlet and permits ram air to enter the air cond distribution ducts.
I imagine you'd only use it on warm days, low altitude , to clear too much cigarette smoke from the cabin (grin). I don't think it's enabled when the airplane is pressurized. Airbus must have worried about oil fumes from the engine bleed air supply. We get some oil fumes from the APU every so often (bad oil seals) but i can't recall anybody needing to use it.
Buzz Fuselsausage: Line Mechanic by night, DC-3 Crew Chief by choice.
Theairbusguy From France, joined Sep 2001, 37 posts, RR: 0 Reply 3, posted (11 years 7 months 3 weeks 6 days 3 hours ago) and read 3493 times:
the ventilation panel allow to control the air flow off the packs, the cabin and cockpit temperature, the 21 packs command (on/off) and the 2 hot airs push buttons.
you can also adjust temperature using the FAP (used by cabine's crew), but the range is less than the selector in the cokpit.