Click to expand Tap to zoom Vertol Helicopters CH-21A,B,C & HH-21B 1957 Maintenance Instructions (1H-21(C)A-2-2) by Vertol Helicopters Sale $48.00 | / SKU 8151:R Printed Manual - $48.00 Download - $48.00 Printed Manual Download Size 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Helicopter Changed 18 November 1969