Rotary Aircraft Designation Crosswalk

HC Helicopter, Cargo
HJ Helicopter, Utility
HN Helicopter, Training
HO Helicopter, Observation
HR Helicopter, Transport
HS Helicopter, Anti-Submarine
HT Helicopter, Training
HU Helicopter, Utility

R Rotary
H Helicopter

HC Helicopter, Cargo
HO Helicopter, Observation
HU Helicopter, Utility

Navy

US Army AF

US Army / USAF

Navy	USAAF	DOD
DSN		QH-50
HCH
HJD
HJH
HJP		H-25
HJS
HNS	R-4	H-4
HO2S	R-5	H-5
HO3S	R-5	H-5
HO4S		H-19
HO5S		H-18
HOE		H-32
HOK		H-43
HOS	R-6
HR2S		H-37
HR3S
HRB		H-46
HRH
HRP		H-21
HRS		H-19
HSL
HSS-1		H-34
HSS-2		H-3
HTE		H-23
HTK		H-22
HTL	R-13	H-13
HU		H-1
HU2K		H-2
HU2S		H-52
HUK		H-43
HUL		H-13
HUM		H-30
HUP-2		H-25
HUS		H-34

Navy	USAAF	DOD
	R-1
	R-2
	R-3
HNS	R-4	H-4
HO2S	R-5	R-5
HO3S	R-5	R-5
HOS	R-6
	R-7
	R-8	H-8
	R-9	H-9
	R-10	H-10
	R-11	H-11
	R-12	H-12
HTL	R-13	H-13
	R-14
	R-15	H-15
	R-16	H-16

Army / USAF	DOD	Services
HC-1A	CH-46C	Army
HC-1B	CH-47A	Army
HO-1
HO-2	HZ-1
HO-2	H-42 / H-55
HO-3
HO-4	OH-4	Army
HO-5	OH-5	Army
HO-6	OH-6	Army
HU-1	UH-1	Army
HX	CH-46B	Air Force
H-2	CH-46B	Air Force
H-13	OH-13	Army
H-19	H-19	Air Force/Army
H-21	CH-21	Air Force/Army
H-23	OH-23	Army
H-34	CH-34	Army
H-37	CH-37	Army
H-41	UH-41	Army
H-43	HH-43	Air Force
H-40	UH-1	Air Force

"Missing" Helicopters
#	Contractor	Notes
H-27	Piasecki	initially the designation for the second YH-16 w/T-38 turbine engines, redesignated YH-16A prior to the first flight in 1955.
H-28	Hughes	Designation assigned to the improved H-17 Model M-190-4A. None ever built.
H-29	McDonnell	Designation assigned to the 2-seat version of the H-20. The project was cancelled.
H-33	Bell	Original Army designation given to the XV-3 Convertiplane.
H-35	McDonnell	Original Army designation given to XV-1. Reserved for Navy use and then cancelled. Designation never utilized.
H-36	Bell?	Reserved for Navy use and then cancelled. Designation later assigned to a classified project, LONG EARS, a/c# 59-5926.
H-38		Reserved for Navy use and then cancelled. Designation later assigned to a classified project, SHORT TAIL.
H-40	Bell	The production models designated UH-1.
H-42	Hughes	Model 269, the YHO-2HU later the TH-55A Osage for the Army.
H-44		Reserved for Navy use and then cancelled. Designation later assigned to a classified project, BIG TOM.
H-45		secret Air Force FTD (Foreign Technology Division) project STEP CHILD.
H-49	Boeing-Vertol	briefly allocated in 1962 to a USAF Model 107 helicopter, then changed to XCH-46B.
H-69		skipped and will not be assigned.

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Military

Rotary Aircraft Designation Crosswalk

"Missing" Helicopters