The topic of ELTs failing to activate is worthy of some discussion. A few years ago, the FAA put mechanics on notice of the (already existing) strict mounting criteria for ELTs. It turns out that quite a few airplanes were crashing, with no subsequent ELT activation.
In a number of those cases, the ELT mounting bracket failed, essentially preventing the ELT inertia switch from turning the unit on. These mounting installations obviously did not meet the very stringent ELT mounting criteria spelled out by the FAA.
So, an initiative was started in an effort to “remind” mechanics to verify the integrity of each installed ELT bracket.
At about this time, I opted to install a 406 ELT in place of the old 121.5 ELT in my plane. In discussing with my mechanic, he pointed out that the existing bracket flexed way too much. So, he fabricated a new, and very solid mounting bracket to mount the new beacon.
The takeaway here? Get a good grip on your ELT, and see if you can move it or it’s bracket. If you can move it, it probably doesn’t meet the proper installation guidelines.
Here is the latest guidance on installation and testing of ELTs: https://www.faa.gov/documentLibrary/med ... _CHG-1.pdf
Note that mounting of ELTs using Velcro straps as at least one manufacturer did in past is a no no, and ELTs should NOT be mounted in baggage compartments.
There’s no point in buying, installing and lugging around a relatively expensive potentially life saving device that’s not properly mounted, and thus set up to fail when you need it most.
MTV


