The Inspector wrote:
'Building airplanes from parts but has no serial number' is a true fact. There are more BELL model 47's flying than were ever built thanks to buying wrecks/junk and 'moving' the s/n to a new airframe that could be from several sources, and I got that from a retired FAA Inspector I know.
Some have c/n's from rebuild shops (Texas, World, etc) ...I'd assume they're legal. At least someone in the FAA okayed them at some time.
I've always assumed they were made from spare/surplus parts. Remember, a helicopter (especially a Bell 47) is not like an airplane, it is an assemblige of parts, no "real" airframe in the airplane sense.
The dynamic components go away at overhaul time, the tailboom can be a legit replacemet part. Does the cabin ID establish the airframe?
Not in my humble opinion. There is not much to it....and some were replaced by shops for single seat AG work (albeit for restriced AG work).
And remember, Bell sub contracted ooouit many of the dynamic components. I've toured the shop that makes the 47 rotor heads, it's not owned by Bell. So they (and we) have to trust the PMA system is working. Again, it's not like Boeing assembling the hull of a jetiner.
I'm not sure why an assembled one would be any less safe than one with a Bell c/n as long as it was made with the correct parts.
The one I used to fly (see photo at left..last known location was in Ft. Worth in unairworthy status) had been wrecked twice since going on the civil register. And when surplused from the Army it was converted from a D-1 (A H-13E) to a civil G. That meant a new or modifed cabin, fuel tanks, a stabilizer...
Did I expect that to have
any of the parts that went down the Bell assembly line in 1951?
No.
Same goes for most General Aviation antiques out there. A lot of home made (home restored?) components are used.
Or any of you have a Beech/Cessna/Piper with a replacement wing fitted after a hailstorm or careless fulel truck driver. Do you feel it's unsafe?
The Bell 47 situation is no worse, and probably better, than many/most of the Mustangs and Spitfires out there.
Look at some of the airworthy warbirds.
Do they
really expect us to belive it is the
same plane that was buried in beach sand from 1945 to 1995?
We all know it's new metal with an old data plate.
So who would you trust...some warbird shop essentially building a new airframe, or a Bell 47 assembled from surplus or PMA's parts?