Consolidated PBY Catalina

Water looped on landing and sank off Pensacola, killing all three crew members.

The crew was completing an anti-sub-marine patrol mission off the South African coast when a fuel exhaustion forced the captain to ditch the seaplane off L'Agulhas. All crew members survived while the aircraft was deliberately sunk by a machine gun.

The crew was completing a night training sortie from Poole. After a waiting period of 25 minutes, the pilot completed a first flare. During a second flare, the aircraft took off in foggy conditions before hitting the water off Poole and sank. Eight crew members were killed while four others were injured. The aircraft was destroyed.
Crew (210th Squadron):
F/O P. R. Duff, †
F/O W. A. Hobson, †
P/O D. O. Ahmed,
Sgt J. S. Garnett,
F/Sgt R. E. Rasmussen, †
F/O M. D. Cohen, †
Sgt R. J. Kington,
Sgt W. Eley,
Sgt A. B. Allen, †
Sgt M. M. Doyle, †
Sgt F. Frogson, †
Sgt G. Harper. †

The seaplane took off from Bowen on an air to sea gunnery training exercise. At the conclusion of firing practice, the aircraft was making a run across the wave tops over a choppy sea and it is assumed that the port wing hit the water and the aircraft crashed into the sea and sank approximately 5 miles east of Bowen. Two crew members survived while 14 other occupants were killed.
Crew (20th Squadron):
F/O Peter Keene, pilot, †
F/O Stanley John Porteous, copilot, †
Sgt Robin Fowler, flight engineer,
Sgt Raymond Charles Ciglander, navigator, †
Sgt Harold Stuart William Thomas, wireless operator and air gunner, †
Sgt Leslie George Dalgleish, fitter, †
LAC Ainslie Ivor Dent, fitter, †
AC1 Cyril Leslie Edwards, armourer.
Passengers:
Sgt Lloyd George Fiske,
S/Sgt Leslie Harry Harrison,
Sgt Robert Ronald Harrison,
Pvt Douglas McLaine,
Pvt Irvine George Osborne,
Cpt Lawrence Edward Tansey,
Pvt Kenneth Reginald Walker,
Cpt Donald Charles Whitfeld.
Source: http://www.adf-gallery.com.au/

Crashed in unknown circumstances into the Atlantic Ocean while on a flight from RAF Castle Archdale to Gibraltar. No trace of the aircraft nor the crew was ever found.

This Catalina had been modified to accommodate a nine lens aerial mapping camera developed by the Coast & Geodetic Survey. The aircraft was manned by a combined crew of Coast Guard and Coast & Geodetic Survey personnel when it crashed into Mount Moffett located 5 miles northwest of Adak, Aleutians Islands, while on a survey mission. All eight crew members were killed.
Crew:
L/Cdr George O. Olson,
Cdr Harry A. Bolles,
L/Cdr Edward L. Carpenter Jr.,
Ens Joe A. Sosbee,
Ens Ray B. Elliott,
Amm Charles E. Isakson,
Rm2 Arthur A. Boeke,
Amm Curtis K. Drennan.
Source: http://www.check-six.com/

The seaplane left Honiara-Henderson Field at 1900LT on July 16 for a 12 hours anti-submarine mission. By night, while cruising along the Vella LaVella Island, the left engine caught fire. The captain attempted to ditch the aircraft few hundred yards off shore but the aircraft crash landed and sank immediately. All 13 crew members were rescued.
Crew:
Lt James W. Anderson, pilot 12.
Source: http://www.vpnavy.com/vp54_mishap.html

Lost without trace into the Gulf of Mexico while on a maritime patrol flight.

Crashed in unknown circumstances into the Tulagi harbor, killing all seven crew members.

Crashed in unknown circumstances into the Mobile Bay, off Mobile, killing all five crew members.