There appears to have been a scuffle around the cockpit of the gyrocopter. As you look closely at the ground it becomes clear that the pilot was not killed in the crash, but was dragged northwest toward the road. The footprints seem to indicate that he was taken by a band of Orcs.
Rolun mentioned a guard named Dorin Vowkeeper who watches the road to the north. Dorin will probably be interested in the parts you're carrying. More importantly, he might have seen where the pilot was taken.
- - Upon Examination: Downed Gyrocopter
Look for the bridge on the main road through Deadwater Quag.
Find Dorin Vowkeeper and inquire about the pilot.
- Speak to Dorin Vowkeeper
On Completion Edit
So, ye've been to the Gyrocopter crash site, eh? And you've brought back some parts? Good, good! I'll have them sent back to one of my kinsmen in Karaz-a-Karak. With the war on, he'll be needin' all the parts he can get.
As for seein' a mob of Orcs, I did spy 'em. A rough lookin' lot they were, and no mistake. The biggest one was a Black Orc with a big sack slung over his shoulder. I reckon that must've been your pilot, though I wish I'd known it at the time. I would have laid into 'em myself!