nt of unit previciUslyrapproifed-447-81 for Airetearch Aviation CO., Los Angeles, Ca. (See, previous _Weight. and Balance 'Data Repiirt #C-3688.)• V. Instal ration using acceptable :Methods. techniques,* and ,praCticei dance With AC43-13-1AChapter ;11; and ChiPter.13::. VI. Weight :and Balance and. Equip