Collins NCS-31A Pro Line 1977 Instruction Book (523-0767709-001) by Collins Sale $72.00 | / SKU 1401:R Printed Manual - $72.00 Download - $72.00 Printed Manual Download Size 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart This item is a recurring or deferred purchase. By continuing, I agree to the cancellation policy and authorize you to charge my payment method at the prices, frequency and dates listed on this page until my order is fulfilled or I cancel, if permitted. Navigation Control System