soon7x7 From , joined Dec 1969, posts, RR: Posted (5 years 10 months 1 week 6 days 23 hours ago) and read 2541 times:
I have a question regarding all aircraft, including military over 12,500 lbs to be required to have on board two transponders for redundancy. Does such a regulation exist?. Example, Boeings, A/Buses, C-130's P-3 Orions, C-117's etc. If both are inop can the type be allowed to fly in controlled airspace. Sure I know the answer, but I would like to hear from someone in the know...thnx...g
As far as FARs are concerned, no, not to the best of my knowledge, unless there's some obscure FAR I don't know about that applies to the military only. So I'm guessing the dual transponder rule is just a military requirement, as they have pretty much their own regs and SOPs
Quoting soon7x7 (Thread starter): If both are inop can the type be allowed to fly in controlled airspace.
Yes. You'd basically get a hold of either FSS or the Radar agency with jurisdiction of the airspace you intend to fly through and let them know beforehand you're coming through. No biggie really.
However, whether the military will actually allow that to be done is a different story.
DiamondFlyer From United States of America, joined Oct 2008, 2393 posts, RR: 4
Reply 4, posted (5 years 10 months 1 week 5 days 21 hours ago) and read 2184 times:
Quoting soon7x7 (Reply 3): Thanks for the responses...but on the types I mentioned, is it typical in avionics layouts to install 2 transponders, not just 1?...g
I would imagine so. I've seen quite a few business jets that have two transponders installed. Heck, I've even seen single engine pistons have 2 transponders installed, just in case. Not a lot of additional cost, and the redundancy to keep going if you've got troubles with one.
YWG From Canada, joined Feb 2001, 1148 posts, RR: 2
Reply 5, posted (5 years 10 months 1 week 5 days 20 hours ago) and read 2167 times:
Quoting soon7x7 (Reply 3): is it typical in avionics layouts to install 2 transponders, not just 1?...g
I've flown twin turbines and twin pistons, and i've only seen two transponders in both! That being said most training planes have only 1 transponder because the school is likely too cheap to shell out for a second.
Sometimes though, there may appear to be only one transponder when in fact there are two. The control face has a toggle switch from Trans. #1 - Trans #2. There are indeed two separate systems onboard, but the control face plate can control either.