Part Number 4N12689-101B having (CAGE Code 55106) and FSC 1560 Airframe Structural Components in stock with ready to ship. Get an instant quote for 4N12689-101B Rail Internal Stair Ladder by Valley Enterprises Inc. Fill the form below with your desired order quantity, targeted price and the expected order-fulfilment date. Our dedicated account manager will get back to you within 15 minutes.