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Known Icing requirements
I'm a little confused as to the requirements that an aircraft must meet
to launch into known icing conditions. To further add to my confusion, the regulatory requirements (may be just the interpretation of?) has changed over the years. My personal situation, I own a '69 Aztec (D model) and 1974 the aircraft had received an STC for "Flight into known icing conditions". The STC included the follow: de-ice boots on the main wings outboard of the engines only de-ice boots on all the tail feathers heated anti-ice (?) pads for both props hot plate (anti-ice) for the windshield In addition the Pitot tube is heated (static port is on the pitot tube so its heated too). The STC specifically says (wording is from memory however) "Approved for flight into known icing conditions" and then gives the severity of the icing encounters as "occasional light to moderate". It further goes on to list what equipment must be working and installed to meet the certification, otherwise if anything is not working or installed, I need to place a plaque saying that flight into know icing conditions is prohibited. I guess the questions are, 1) if the testing for the STC was to be done all over again today, would this aircraft succeed? or is todays certification process for icing so much tougher that it wouldn't pass? 2) What is occasional? less than 1/2 hr in icing conditions? Just long enough to climb or descend through it? 3) Reading through an article on known icing aircraft requirements recently published by AOPA (ASF?) it was said that a heated stall warning switch was also required, I do not have one, and its not listed as a requirement in the STC. thanks... Jeff |
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