Drilled and riveted 4 HG-20 gussets to upper cabin reinforcement HF-104 and HF-11 trailing edge conneting tubes using a total of 32 1/8" rivets.
Installed 2 overhead cabin stiffeners (HB-33) onto HF-90TP forward curved overhead and HF-91 front down tubes using 1/8" rivets. See Inst. 15, dwgs 2 and 4.
