BrickLink - Part 4868bpb005L : LEGO Engine, Smooth Large, 2 x 2 Thin Top Plate with Blue V-Shaped Stripe, 'CAUTION' and Filler Cap Pattern Model Left Side (Sticker) - Set 4439 [Aircraft, Decorated] - BrickLink Reference Catalog
Set 4439-1 : Heavy-Duty Helicopter [City] [BrickLink]