So I downloaded what is supposedly an early Bellanca owner's manual (pre 75). Supposedly, because it seems to simply removed the applicability page in the beginning which referenced Champion aircraft. Otherwise, it's identical to the Champion manual - with the additional exception that it's cover is now blue. See the operating limitations below - allowing IFR with optional equipment, and stating to disregard this section and go by placards in the plane. The manual from '75 onwards is different. While '75 onwards states the aircraft is approved for VFR day and night only, it too states that the final authority are placards in the aircraft. Hence why I'm curious if anyone has ever seen a placard in Bellanca aircraft limiting it to VFR only, and where would that placard come from if it's not in the CTDS?
That's why this is such a puzzle : there were no certification restrictions against IFR to begin with. Bellanca changed the wording in the owner's manual to say it's only approved VFR only - but states you should follow placards. Then in '79, the owner manual became the AFM - now required both by regs and the TCDS as mandatory equipment. So this contradictory limitation became codified, for absolutely no apparent reason. No one cared for like 3 decades until modern digital avionics make IFR viable.
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