X-1 — Flight Training School December 7, 1941 — Lost March 3, 1942, during the Japanese air raid on Broome.
X-2 — Flight Training School April 1941 — Destroyed April 24, 1941, during takeoff accident at Morokrembangan while on training flight.
X-3 — Flight Training School April 1941 — Lost March 3, 1942, during the Japanese air raid on Broome.
X-4 — Flight Training School April 1941 — Lost November 13, 1941, in night landing accident at Morokrembangan while on training flight.
X-5 — Flight Training School December 7, 1941 — Evacuated to Rathmines NAS, Australia, February 19, 1942, with MLD flight training school. To RAAF April 29, 1942, and scrapped December 20, 1944.
X-6 — Flight Training School December 7, 1941 — Lost February 3, 1942, to strafing fighters in initial air raid on Morokrembangan.
X-7 — Flight Training School December 7, 1941 — Evacuated to Rathmines NAS, Australia, February 19, 1942, with MLD flight training school. To RAAF April 29, 1942, and scrapped December 20, 1944.
X-8 — Flight Training School December 7, 1941 — Evacuated to Rathmines NAS, Australia, February 19, 1942, with MLD flight training school. To RAAF April 29, 1942, and scrapped December 20, 1944.
X-9 — Flight Training School December 7, 1941 — Evacuated to Rathmines NAS, Australia, February 19, 1942, with MLD flight training school. To RAAF April 29, 1942, and scrapped December 20, 1944.
X-10 — Flight Training School December 7, 1941 — To RAAF April 29, 1942, and destroyed by fuel tank at Port Darwin March 11, 1944.
X-11 — Operational with GVT.2 December 7, 1941 — Burned on water at Kalkas Seaplane Base on Lake Tondano December 26, 1941.
X-12 — Operational with GVT.2 December 7, 1941 — Burned on water at Kalkas Seaplane Base on Lake Tondano December 26, 1941.
X-13 — Operational with GVT.4 December 7, 1941 — Burned by Japanese aircraft February 7, 1942, at MLD support base on Rotti Island.
X-14 — Operational with GVT.4 December 7, 1941 — Lost in the early morning of January 23, 1942, while attempting to land on Songei River at Balikpapan during evacuation flight.
X-15 — Operational with GVT.1 December 7, 1941 — Shot down by Japanese bomber near Midai Island December 27, 1941.
X-16 — Operational with GVT.8 December 7, 1941 — Damaged March 1, 1942, during Japanese air raid on Tandjoeng Priok and possibly destroyed by MLD ground crews to prevent capture. Could also have been lost to mechanical failure over Indian Ocean during evacuation flight on March 1, 1942, after repairs by MLD ground crews.
X-17 — Operational with GVT.8 December 7, 1941 — Lost to Japanese fighters off Noordwachter Island following air raid on Muntok Harbor February 24, 1942.
X-18 — Operational with GVT.8 December 7, 1941 — Lost to Japanese fighters off Noordwachter Island following air raid on Muntok Harbor February 24, 1942.
X-19 — Operational with GVT.3 December 7, 1941 — Lost January 25, 1942, while attempting night landing at Soerabaja after a failed rescue flight to Greater Masalembo Island.
X-20 — Operational with GVT.3 December 7, 1941 — Lost March 3, 1942, during Japanese air raid on Broome.
X-21 — Operational with GVT.4 December 7, 1941 — Lost February 25, 1942, to Japanese fighter while on night reconnaissance and minelaying flight over Bali and Lombok Straits.
X-22 — Operational with GVT.3 December 7, 1941 — Destroyed in Japanese air raid on Morokrembangan on February 5, 1942.
X-23 — Reserve Status December 7, 1941 — Lost March 3, 1942, during Japanese air raid on Broome.
X-24 — Flight Training School December 7, 1941 — Evacuated to Australia March 2, 1942. Transferred to RAAF October 1943
X-25 — Operational with GVT.2 December 7, 1941 — Burned by Japanese fighters at Kalkas seaplane base on Lake Tondano December 26, 1941.
X-26 — Operational with GVT.5 December 7, 1941 — Burned by Japanese fighters at Kalkas seaplane base on Lake Tondano December 26, 1941.
X-27 — Operational with GVT.5 December 7, 1941 — Forced down at sea and lost December 23, 1941, as a result of damage suffered during MLD air raid on Davao, Philippines.
X-28 — Operational with GVT.6 December 7, 1941 — Lost March 3, 1942, during Japanese air raid on Broome.
X-29 — Operational with GVT.6 December 7, 1941 — Lost February 11, 1942, in night landing accident at Soerabaja following failed night evacuation flight to Bandjermasin.
X-30 — Operational with GVT.5 December 7, 1941 — Lost February 3, 1942, to strafing fighters in initial air raid on Morokrembangan.
X-31 — Operational with GVT.6 December 7, 1941 — Lost February 3, 1942, to strafing fighters in initial air raid on Morokrembangan.
X-32 — Operational with GVT.7 December 7, 1941 — Burned by Japanese aircraft February 7, 1942, at MLD support base on Rotti Island.
X-33 — Operational with GVT.7 December 7, 1941 — Destroyed in Japanese air raid on Morokrembangan on February 5, 1942.
X-34 — Operational with GVT.7 December 7, 1941 — Damaged by Japanese fighters December 17, 1941, during MLD air attacks on invasion convoy off Miri, British Borneo, and made forced landing.
X-35 — Operational with GVT.1 December 7, 1941 — Burned by Japanese aircraft February 7, 1942, at MLD support base on Rotti Island.
X-36 — Operational with GVT.1 December 7, 1941 — Evacuated to Australia March 3, 1942. Made forced landing on North Australia beach and burned by crew on March 5.
X-37 — K-2 model that arrived Morokrembangan May 1940 with defective engines and was never operational with MLD — Destroyed February 3, 1942, in Japanese air attack on Morokrembangan.