
On September 18, 1962 the United States Department of Defense (DoD)
introduced a unified designation system to all
USAF, US Navy, US Coast Guard, USMC and US Army aircraft
largely based on the one used by the US Air Force from 1948.
NASA's Experimental aircraft was also assigned in the X-series.
This is a list of the helicopters affected :
Bell | |
Bell 47: H-13E ![]() H-13G ![]() H-13H ![]() H-13H ![]() H-13J ![]() H-13K ![]() HTL-4 ![]() HTL-6 ![]() HTL-7 ![]() HUL-1 ![]() HUL-1G ![]() HUL-1M ![]() |
UH-1 Iroquois : HU-1A ![]() YHU-1B ![]() HX/H-1 ![]() HU-1B ![]() HU-1D ![]() HU-1E ![]() Bell 206: HO-4 ![]() |
Boeing Vertol | |
Sea Knight: HRB-1 ![]() HX/H-2 ![]() HC-1A ![]() |
Chinook: HC-1B ![]() |
Fairchild-Hiller | |
HO-5 ![]() |
Hiller | |
H-23B ![]() H-23C ![]() H-23D ![]() H-23F ![]() |
Hughes | |
HO-6 ![]() |
Cessna (Seibel) | |
YH-41 ![]() H-41 ![]() |
Gyrodyne | |
DSN-1 ![]() DSN-2 ![]() DSN-3 ![]() |
Kaman | |
Huskie : H-43A ![]() H-43B ![]() HUK-1 ![]() HOK-1 ![]() HTK-1 ![]() Seasprite : HU2K-1 ![]() HU2K-1U ![]() |
Lockheed | |
XH-51A ![]() |
Piasecki | |
H-21A ![]() H-21B ![]() SH-21B ![]() H-21C ![]() HUP-2 ![]() HUP-3 ![]() |
Sikorsky | |
S-55 SH-19A ![]() H-19A ![]() SH-19B ![]() H-19B ![]() H-19C ![]() H-19D ![]() HRS-3 ![]() HO4S-3 ![]() HO4S-3G ![]() S-56 H-37A ![]() H-37B ![]() HR2S-1 ![]() |
S-58 H-34A ![]() H-34C ![]() HUS-1L ![]() HUS-1 ![]() HUS-1Z ![]() HUS-1A ![]() HUS-1G ![]() Y/HSS-1 ![]() HSS-1 ![]() HSS-1F ![]() Y/HSS-1N ![]() HSS-1N ![]() S-61 Y/HSS-2 ![]() HSS-2 ![]() HSS-2Z ![]() |