1946 Taylorcraft BC12-D N96608 S/N 8908
This aircraft is being modified I/A/W STC SA1-210 Conversion of Taylorcraft Model BC or Model BC12D to the equivalent of aircraft models BC12D85, F19. This STC incorporates fuel system modifications to allow the use of a larger engine. This STC also incorporates minor structural changes to allow a gross weight increase to either 1280 lbs or 1500 lbs depending on model choice, however these structural modifiacations were not accomplished per attached letter of approval from FAA Engineering dated May 21, 1974. Aircraft gross weight remains at 1200 lbs. The TCDS for the F19 allows the use of up to Continental 0-200 engines. I am installing a Continental C-90-12F engine of 90hp. Reference Aircraft Specification A-696 BC12-D-85 and TCDS 1A9 Model F19. This field approval is not valid without the installation of STC SA1-210 with exceptions noted above.
Installed Continental C-90-12F engine and Sensenich 76AK-40 propeller.Installed Hanlon-Wilson exhaust due to unavailable Taylorcraft exhaust for this combination, exhaust is certified for installation on C90-12F. Placarded engine instruments in accordance with the engine manufacturers operation manual limits.This engine and prop is a FAA certificated engine and prop combination. This engine mounts directly to the existing engine mount with no modification. No cowling modification is required. No weight and balance changes. No aircraft operational changes. Weight and balance accomplished and recorded in aircraft logbooks.
Instructions for Continued Airworthiness
#1 This form 337 will become part of the aircrafts maintenance records. These ICA's will be incorporated into the aircraft annual inspection
#2 Replacement of Continental C-85 engine with Continental C-90 engine. No interface with other systems.
#3 No special control or operation procedures
#4 No change
#5 Inspect at each annual inspection using Taylorcraft BC12-D Service Manual and Continental C-90 Engine Manual as revised and CFR 43 Appendix D.
#6 Reference Continental C-90 Engine Manual as revised.
#7 Remove In accordance with Taylorcraft Service Manual.
#14 No additional overhaul time limitations
#16 For changes to the ICA's contained on this 337 a letter will be submitted to the FSDO for acceptance. Once accepted a log book entry will be entered in the aircraft logbooks identifying the revision, location, and date. END