52 Doors and Introduction to Zone & Station identification
TTP ATA 52 Beech 90 Series B1-L3 Doors B2-L1 B2-L1 Introduction to Zone & Station identification B2-L1 CABIN ENT R Y DOOR The cabin ent r y airstair door is on the left side of the fuselage, just aft of the wing. A s wing-d o wn doo r , hinged at the bottom, provides cabin pressurization and security for flight and a co n v enient stair w a y for ent r y and e xit. T w o of the three steps are m o v a b le and automatical l y fold flat a g ainst the door in the closed position. T w o plastic-encased ca b les, one at the for w ard edge and one at the aft edge of the doo r , pr o vide suppo r t for the door in the open position, a hand- hold for passengers, and a means of closing the door from inside the aircraft. Original l y on l y the aft ca b le w as installed. Later the for w ard ca b le w as optional, b ut cu r rent production aircraft h a v e both ca b les installed. The aft ca b le can be tempora...