How long do windows last?

[rk]

We have a 1978 Cessna 182 and we are installing the BRS parachute system. To install the system, they need to make a hole through the rear window for the straps, and that would make any future window replacement trickier. The A&P is asking if we want to replace the windows now (it's already crazed). Since it's a rear window, I don't really care too much about the condition of the window as long as stays in place in one piece. So I am not sure if it's worth doing the replacement now (it's going to cost ~$900 + 6-8 hours of labor). Any idea how much more useful life we can get out of these windows? (Pictures attached)

 

[Bell206]

Any idea how much more useful life we can get out of these windows?

Hard to tell from the pic. But if it isn't an issue for you don't see the need to change it especially if cutting a hole in it. The only issue you may have depending on the severity of the crazing, there can be a chance after the hole is cut, cracks could form over time. Do they install a doubler around the hole as part of the install?

 

[Racerx]

If it's already crazed, do it. You're already shelling out how much for the BRS? Had a crazed door window that turned into a full blown crack. Ended up removing it in pieces even with care.

 

[rk]

Hard to tell from the pic. But if it isn't an issue for you don't see the need to change it especially if cutting a hole in it. The only issue you may have depending on the severity of the crazing, there can be a chance after the hole is cut, cracks could form over time. Do they install a doubler around the hole as part of the install?

Not 100% sure what a doubler is, but they do seem to install some kind of structure around the hole. This is how it's supposed to look like:

 

[Bell206]

Not 100% sure what a doubler is, but they do seem to install some kind of structure around the hole.

The white part is a doubler or reinforcement of the cutout area. Perhaps have a mechanic review the window and if the crazing is more optics than structural keep it. Unfortunately, based on your original pic can't offer anything definitive but maybe for comparison inquire on what additional cost there would be to change the window at a later date and go from there?

 

[455 Bravo Uniform]

Picture is not helping.

Can you replace the window in the future with BRS in place, and what would the labor cost be vs today?

Does your rear window leak at all?

Are cosmetics important? Can you simply tint the rear window?

 

[Hang 4]

Rear window, so transparency isn't that big of a deal. Assuming no cracks that compromise the structural integrity and no leaks that a re-install would solve, I'd just use the existing window.

 

[GeorgeC]

Five or ten years, then Microsoft will force you to upgrade.

 

[pfarber]

FAR 43 Appendix-D-to-Part-43(c)(3) Windows and windshields—for deterioration and breakage.

Until you IA says you need a new one?

 

[2-Bit Speed]

Less every time M$ offers an update.

 

[WDD]

Two missing pieces:
1) How much additional will it cost to work around the BRS if you install a new window later.
2) Is the current window condition such that you are going to replace it the next 3-5 years anyway?

If your window is fine, it probably doesn't make sense to spend money to buy a new window that you don't need to "save" some "working around the BRS labor" money that a future project might cost you.

 

[Stewartb]

The labor is in drilling out the retainer strip rivets, fitting the new window, re-riveting, and pai ting the rivets. Would I do it? Given the mod’s expense and complexity? Yes, I would. Otherwise all I’d see when showing off my fancy new parachute would be how old and tired that window looks.

 

[bnt83]

Just put a new window in now if you have any plans to replace others while you own it.

 

[MountainDude]

Cant answer your Q, but congrats on getting the BRS. Such a good decision.