AC 105-2C authorizes the Cessna 170 (and others) to fly with one door removed. It is specifically addressed for the purpose of parachuting but you may make appliecation to your local FSDO for authorization for your aircraft. The Advisory Circular should pave the way for you.
Here's a link to download a copy: http://www.airweb.faa.gov/Regulatory_an ... 105-2c.pdf
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention. An originality nut (mostly) for the right reasons.
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