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The BAS installation was STC'ed, and the attachment point was directly behind the pilot's head. We did not drill a hole in the spar, but I don't have more details than that. Remember, the BAS isn't a true 4-point. It has 3 points of attachment on the airframe and 4 points at the main buckle. The dual shoulder straps attach at a single point behind the pilot's head, split to go around the pilot's neck, and then two buckles attach at the center of the pilot's waist.
One nice feature of the AmSafe belts is that the 3rd shoulder harness is not required. Certainly we want it, but it's not a legal necessity. You can install the lap belt & airbag and fly safer than you were before while you wait on engineers and paperwork to determine how you will add the shoulder belt. The shoulder belt needs to cross the pilot's body diagonally, so the attachment point directly behind the pilot's head won't be appropriate.
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1969 T337E
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