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They have seats for couriers, same as factory freighters, but roomier. Note: From the -400BCF type certificate: There are no provisions for the carriage of passengers. A maximum of 19 couriers can occupy the aft cabin of the upper deck as defined in AFM. Source: airplane-pictures.net Above is the upper deck of a -400BCF (converted freighter). And ...


6

Pressurization is primarily for crew and passenger comfort. The B307 was a very early attempt at cabin pressurization and the marginal pressurization differential of only 2.4 psi did not allow much of an increase in cruising altitude. The difference between 8,000’ and 12,000’ did not really justify the added expense and weight. When the B307s were ...


2

The cost of approving an STC for an aircraft can be quite expensive and the return on investment may not have been worth it. ------------------------------------------ |Aircraft | # Built | Year Certified | ------------------------------------------ |Learjet 23 | 104 | 1964 | |Learjet 24 | 259 | 1966 to 1976 | (All variants) |...


1

Since this is an aircraft for personal use, is under 19,000lbs gross weight, and less than 19 seats it will fall under Part 23. If you don't plan on selling "kits" to do these modifications, then an STC is not required. STC's are only for modifications intended for sale to aircraft for installation by an A&P mechanic. STC's are required not for the kit ...


1

You will most likely need a Supplemental Type Certificate from EASA According to their FAQ, emphasis mine: My aircraft has been modified in the USA by Form 337 action. Can EASA accept this? Answer EASA accepts alterations on non-critical components that are substantiated via Form 337, as detailed in the EASA-FAA Technical Implementation ...


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