Number of FAA-registered 337's
 

Hi all,

Since I was doing some data crunching on the FAA aircraft registry database to generate a mailing list to try to get the word out on the potential S-TEC 3100 STC, I generated some stats on the number of FAA-registered 337's. Here they are by individual FAA aircraft model code:

FT337GP = 1
337 = 48
337A = 58
337B = 40
T337B = 19
M337B = 34
337C = 32
T337C = 15
337D = 43
T337D = 7
337E = 20
T337E = 6
T337F = 4
337F = 23
T337G = 117
P337 = 2
337G = 98
P337H = 33
337H = 10
T337H = 24

Reims FT337E = 1
Reims F337F = 1
Reims F337G = 3
Reims F337H = 1
Reims FT337GP = 7
Reims FTB337G = 1

Looks like the 337G and T337G are by far the most common in the US.

-Ryan

Good post. I've read that the 337 is the most abandoned airframe. Not sure if that's true, but it would be interesting to compare the percentage of airframes currently registered vs number built to get a "Percentage still active", then compare that percentage to other light twins of the era.

The same math could be done by model to determine which model of the 337 has the highest and lowest "Percentage still active". I would theorize that the later models have a far higher percentage active than the early models.

There are 73 Canadian Registered aircraft as well.

Soo...in US and Canada ther eare 649 + 73 = 722. Not including some that are in still flying in Europe (that includes you UK, Brexit be damned), Africa and Australia and other parts of the world...lest estimate another 50 there.

So Cessna/Reims built 2993 Skymasters of all variants, including 513 military O-2 versions.

Assume we are NOT counting the O2 some of those had...unexpected landings...and many will be in a military bone yard.

So 31% (772/2480) are still registered and assumed flying. That doesn't seem so bad considering that:

1. doesn't include the planes that have crashed
2. planes that have timed out (don't forget many of these planes worked for a living...fire, forestry, pipeline ect)
3. the airframe is 60+ years old and hasn't been produced in about 40 years.

Goes to how tough they are and their owners. Now only if we could get the manufacturers on board.

Chris

Wikipedia shows the number of each model produced

Ok here goes. Percentage of Active Airframes by Model.
I used Wikipedia as Kim suggested and if there is a ? after the first number, it means the production of that model was not shown in Wikipedia:

FT337GP = 1/?
337 = 48/239 = 20%
337A = 58/255 = 22.7%
337B = 40/230 = 17.4%
T337B = 19/?
M337B = 34/?
337C = 32/223 = 14.8%
T337C = 15/?
337D = 43/215 = 20%
T337D = 7/?
337E = 20/100 = 20%
T337E = 6/?
T337F = 4/?
337F = 23/114 = 20.2%
T337G = 117/292 = 39%
P337 = 2/?
337G = 98/352 = 27.8%
P337H = 33/64 = 51.6%
337H = 10
T337H = 24

Out of the available data, the P337H far outstrips all other models with over 50% still active. The runner up is the T337G at 39%, which is the predecessor of the P337H. The 337G comes in third at 27.8%. The average for the rest of the fleet is below 20%.

Oh you guys have also forgot about the 336

2nd place, not too bad as I never finish first. :)

There were 195 built 336 airframes and only 34 left registered in the US and of which 6-7 of those are not flying leaving a mere 14% left in operable condition...at best.

Let's look at another popular Cessna Model, the 310R/T310R.

Total production: 1332
Total registered: 500

500/1332 = 37.5% Active Airframes

The 310R is considered the penultimate 310, and even its 37.5% active is well below our P337H (51.6%), and not quite as high as our T337G (39%).

Let's look at some older 310 models:

C310K (1967) : 77/245 = 31.4% Active

C310F (1961): 41/155 = 26.5% Active

So the older 310s are significantly more active than our older models, yet our newer models are more active than the same-era 310s. Why do you suppose this is? What changed?

If you could somehow look at a year's worth of ADSB data and see how many unique (N number) returns there were in that year, that would give a better idea of how many 337s are active.