Below Per Joe Baugher's database:
Boeing B-17G-20-BO Fortress 42-31604 delivered Denver Nov 28, 1943; Cheyenne Dec 12, 1943; Kearney Dec 22, 1943; Meeks Field Jan 4, 1944;
Assigned to Soxo at CFB Goose Bay, Labrador as replacement a/c to RAF Nutts Corner, N. Ireland Jan 13, 1944.
On ferry flight from Labrador to Ireland on 13 Jan 1944, B-17G 42-31604 was forced to ditch in Loch Quich, Inverness, Scotland due to the loss of two engines. RTD,
Salvaged RAF Feb 28, 1944. (FORTLOG)
Below Per
https://acia.co.uk/1944/01/13/b17-42-31604/Accident Details
The aircraft was on a transatlantic ferry flight from Goose Bay to Nutts Corner when, 600 miles off the Scottish coast, it suffered an engine failure, the wireless went u/s and the pilot decided to ditch in Loch Quoich on the western coast of Scotland.
Four crew bailed out into the loch but sadly Sgt Leonard was drowned.
The Crash Site
The aircraft was salvaged by members of 56 Maintenance Unit based at Inverness and they beached the aircraft on 29th February 1944, after a month’s work. The aircraft was broken up on the shore and removed in sections to the nearest road some considerable distance away.
The Loch is large so pinpointing the exact location where the aircraft was beached proved difficult. It wasn’t until we realised that the level of the Loch was raised when it was dammed in the 1950’s that the pieces of the jigsaw came into place. In the background of the contemporary photos a sizeable building can be seen which isn’t present on modern day maps. This building, historically the only sizeable construction on the shore of the Loch, turned out to be Glenquoich Lodge which is now under water.
It seems that the aircraft was brought ashore just to the west of the lodge and removed along the very narrow road out of the glen.

Floatation bags were used to bring the B17 to the surface of the Loch. In the background is what we believe to be Glenquoich Lodge. (credit James Clague)

The B-17 appears on the surface and is prepared to be dragged ashore. (credit James Clague)

The B17 having been dragged ashore. (credit James Clague)

Another view of the B-17 on the shore of Loch Quoich. Note the Port inboard propeller and starboard outboard propellers are in the feathered position. The peninsula of Rudha Liath is behind. (credit James Clague)

Recent view of same area on the Loch.