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![edo floats maintenance manual edo floats maintenance manual](http://www.flight1.com/images/l4float/l4floats1.jpg)
(incidentally, the formal correction resulted in climb numbers within one FPM of my uncorrected data, so I was not far off!). When it came to the full STC, corrected data was required, so an FTE was hired to take my climb data and correct it. TC allowed me to approve that Turbo Beaver with the multi mod combination by sSTC without the corrected climb data. I gathered extensive climb data, but did not do the formal FTE data correction. I participated in flight testing for a multi mod Turbo Beaver last summer (a magnificent plane!). If it's a full STC, and if TC thinks that there could be a future request for foreign validation, they know there will be more eyes on the file, and they tend to expect more data. If I can show that performance is not decreased by a mod, or combination of mods, TC generally is open to an argument of "equal to or better than", and leave it at that, if I do some modest flight testing to gather than data to justify that determination. I flew it out of a really tight Norwegian lake in weird winds last summer, it was a Spidy senses exercise, not stop to look up the numbers, 'cause I did not have lake lengths and hill elevations anyway. It worked with a comfortable reserve - 'cause the plane was better than the books).
![edo floats maintenance manual edo floats maintenance manual](https://wipaire.com/wp-content/uploads/2016/07/IMG_6539.jpg)
960 foot runway (which I walked first), charts said I'd need 890 feet of runway in and out. I did check the numbers, just to be legal for the insurance. I was asked by the owner to demonstrate it in and out of a very short Norwegian fjord grass runway years back (it's on Youtube). But, I was able to demonstrate that the factory, and existing STC performance charts were enough. More than 20 hours of flight testing to approve. O-550, MT reversing prop amphib, GWI, and all kinds of wing mods. I modded a 182, with 27+ STC's for a client. We all knew that the plane was a runway hog - for that cost, we knew exactly how much! For the corrected takeoff distance (on wheels only) and climb data, the cost of the FTE analysis was $16,700, on top of my costs to gather the data, and the airplane operating costs for the testing. I did many hours (I want to say ten or so) of performance data gathering, after which the flight test engineer did all the analysis and produced corrected performance charts. One of my projects, a modified Cessna Grand Caravan, was required to have performance data generated (because the mod impacted performance seriously). I've done it a few times, and never considered the resulting performance data worth the cost to get it, apply the required corrections, write the flight manual supplement, and have it approved. Gathering and approving performance is an immense task. This topic is the elephant in the room with TC, with respect to mods, particularly multi mods.
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