Yesterday, I inadvertently left a 365 with a Holosun 407k in unpressurized baggage for a 2.5 hour flight. It was at 43,000 for nearly two hours. The optic was turned off.
Turned it on last night and it seems fine. Any idea whether red dot optics should survive unpressurized storage, or if there is something I should now worry about with this optic. Same question for a traditional rifle scope.
Likes pretty much everything in every caliber.
Doubt it would cause any problems.
(& I think the cargo hold on commercial aircraft is pressurized).
Edit: Sorry I misread that as an EPS, not a 407k. Yeah, I suspect that'd be even less a problem than a sealed EPS since it's an open emitter.
Not an aviator, but isn't ambient air pressure at 43k ft around 2 to 3 psi? (at sea level, it's 14.7, more or less, right?) Holosun doesn't list EPS pressure specs, just storage and working temperature. (Storage Temperature -40℃~70℃, Working Temperature -30℃~60℃). It's IPX8 waterproof; wiki says level 8 is typically down to 3 meters/10 ft water (maybe 18-19 psi?). I'd be astonished if it could not hold a vacuum down to a couple psi though.
Last edited by RJ; 06-26-2023 at 08:03 AM.
Agree. If a commercial flight, the cargo area is pressurized.Originally Posted by Badsalad
Same as how it was shipped overseas from China…
If it were truly unpressurized like if it were in the wheel well attached to the landing gear… that might be different… but probably not an issue on an open emitter.
I'd expect rapid temperature changes and extremes to have much more of an effect on an open-emitter device. Whether sealed optics will be damaged by temperature changes combined by low pressure is a good question. Anyone want to try this with an EPS? @GJM, this seems like something you would do
“There is no growth in the comfort zone.”--Jocko Willink
"You can never have too many knives." --Joe Ambercrombie
This baggage compartment is not pressurized.
Likes pretty much everything in every caliber.
Here are links on camera lenses relevant to the topic:
https://www.fredmiranda.com/forum/topic/1605782/0
https://www.dpreview.com/forums/thread/3209451
...and I have a message inbound to a friend who worked at NASA
“There is no growth in the comfort zone.”--Jocko Willink
"You can never have too many knives." --Joe Ambercrombie
Paging @Wayne Dobbs
David S.
ACRO P-2 is submersible to 115 feet (35 meters) and can operate at temps from -60F to 160F. Unsure about altitude extremes, but will ask.
Regional Government Sales Manager for Aimpoint, Inc. USA
Co-owner Hardwired Tactical Shooting (HiTS)
Out of curiosity what model airplane?
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