Training

The crew was performing a training flight in the region of Poole. While landing in the Poole harbor, the seaplane christened 'Dog-Able' went out of control and crashed. Three crew members were killed while three others were injured.
Those killed were:
R/O Reginald Martin,
R/O Fred Mitchell,
Mr Loweman, flight engineer.
Source & photo:
http://www.pooleflyingboats.com/archive/Momentum-for-the-Postwar-Era-at-Poole.pdf

Shortly after take off from the bay of Hobsonville, while climbing, the aircraft stalled and crashed into the sea few hundred yards off shore. A crew member was killed while both other occupants were injured. The aircraft was lost.
Crew:
P/O Morris Bee, pilot, †
Sgt D. Leslie,
LAC A. Larkman.

The crew was involved in training mission jointly with a Lockheed P-38 Lightning. In unknown circumstances, both aircraft collided and crashed into the Puget Sound, about two miles off Richmond Beach. All seven crew members on both aircraft were killed.

The crew was engaged in a training flight off the west coast of Nova Scotia. En route, the twin engine aircraft disappeared and crashed in the Gulf of Maine, off Port Maitland. Some debris were found three days later but no trace of the four occupants.
Crew (34th OTU):
P/O Thomas Anthony Corr, pilot,
P/O Fintan Howard Lalor, navigator,
F/S David Armstrong Cannon, wireless operator and air gunner.
Passenger:
O/S Ronald Herbert Faulkner.
Source:
http://www.rootsweb.ancestry.com/~nbpennfi/penn8b3Accident_MishapReports.htm

While cruising in the vicinity of McDill AFB, on a training sortie, the twin engine aircraft went out of control and crashed into the Tampa Bay. All five crew members were killed.
Crew:
Allen M. Okell, pilot,
Reginald R. Reynolds,
Lt Roy Albert Skow,
Francis P. Martin 1.

The crew was performing a training flight at South Plains AFB. The twin engine aircraft crashed in unknown circumstances in the vicinity of the airbase, killing all three crew members.

Crew was performing a training flight in the vicinity of Fayetteville-Pope AFB, North Carolina. While flying in bad weather conditions, crew encountered problems and attempted an emergency landing in a field. Aircraft hit tree tops and crashed in a wooded area. Crew fate unknown.

Crashed in unknown circumstances 3 miles south of Davis Monthan AFB. All eight crew members were killed.

Crew was performing a training flight in the vicinity of Del Rio-Laughlin Field. After touchdown, the aircraft went out of control, veered off runway and collided with another aircraft. All four crew members were killed.
Crew:
S/Sgt Robert Harris Steed,
1st Lt Walter F. Griffin,
2nd Lt Benjamin L. Littlejohn,
S/Sgt John R. McGuire.

Water-looped on landing and sunk off Whidbey Island NAS. All four crew members were killed.