54 Nacelles/Pylons
TTP B1-L3 ATA 54 Beech 90 Series B2-L1 Nacelles/ pylons The c o wling encloses each p o w e r plant and acces sories from the fir ew all for w ard. The c o wling consists of four assem b lies: the for w ard upper and l o w er c o wlings and the aft upper and l o w er c o wlings. Refer to the Hoisting procedures in the AMM and CMM. Forwa r d Upper Cowling The upper for w ard engine nacelle panel is const r ucted using three stiffeners, an aft dou b le r , and nacelle skin to pr o vide for strength and shape the nacelle around the engine. This fo r ms a strea m lined f airing across the upper pa r t of the engine to impr o v e aircraft perfo r mance b y reducing drag. The upper for w ard nacelle is attached using a set of alignment studs and a hook and cam assem b l y that secures the upper for w ard...