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When summer gets here, I may not want to fix this "problem", but....
Flying the other day in cold temps, I was feeling a draft on the back of my neck. At first I thought it was the back seat eyeball vent (I sometimes aim it my way for extra ventilation in the hot summertime), but I eventually figured out that it was coming from the shoulder harness slot in the headliner!
My first thought is that one of the vent tubes that feeds the eyeball vents in the headliner has broken or come loose, and the air is escaping via the shoulder harness headliner slot. However, flow to both front eyeball vents is still high, and flow from the rear eyeball vent on that side also seemed good. (I didn't try to reach the stbd side rear vents or shoulder harness penetration to check flow through them.)
I looked in the maintenance manual (2008 version) to see how the eyeball vents are fed, but I couldn't find a figure showing the ducting to those vents. I know I've seen that figure before, but all I see are Figs 13-1 through 13-11 on pp. 4I17 though 4J3 (how'd they come up with that weird page numbering scheme, anyway?). None of the figures show any eyeball vents in the headliner; the only overhead ventilation drawing is the last one which shows the optional forced-air ventilation system which uses the blower from the a/c system and the middle louvered vents.
Can anyone point me to the drawing of the overhead vent ducting?
Flying the other day in cold temps, I was feeling a draft on the back of my neck. At first I thought it was the back seat eyeball vent (I sometimes aim it my way for extra ventilation in the hot summertime), but I eventually figured out that it was coming from the shoulder harness slot in the headliner!
My first thought is that one of the vent tubes that feeds the eyeball vents in the headliner has broken or come loose, and the air is escaping via the shoulder harness headliner slot. However, flow to both front eyeball vents is still high, and flow from the rear eyeball vent on that side also seemed good. (I didn't try to reach the stbd side rear vents or shoulder harness penetration to check flow through them.)
I looked in the maintenance manual (2008 version) to see how the eyeball vents are fed, but I couldn't find a figure showing the ducting to those vents. I know I've seen that figure before, but all I see are Figs 13-1 through 13-11 on pp. 4I17 though 4J3 (how'd they come up with that weird page numbering scheme, anyway?). None of the figures show any eyeball vents in the headliner; the only overhead ventilation drawing is the last one which shows the optional forced-air ventilation system which uses the blower from the a/c system and the middle louvered vents.
Can anyone point me to the drawing of the overhead vent ducting?
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