Re-engined US Navy & Canadian version with 700HP Wright R-1300 Cyclone engine. Redesignated UH-19F (American variant) & HO4S-3 (Canadian & Dutch variants) in 1962. 103 built: including 61 for USN, 3 for Dutch MLD, 15 for UK RN as Whirlwind HAS.22, 10 for RCN, & 14 for USCG. 
HO4S-3: 133844 - 133853, contract NOa(s) 42-471 (MDAP) cancelled, airframes not built.
HO4S-3: 138432 - 138459, contract cancelled, airframes not built.
List of Operators of HO4S-3 |
| Years | Model | Org | |
|---|---|---|---|
| 1951/57 | S-55 H-19 |  US Navy | |
| 1951/66 | S-55 H-19 | US Coast Guard | |
| 1952/68 | S-55 H-19 |  Royal Canadian Navy (1945-1968) | |
| 1952/62 | S-55 H-19 |  Fleet Air Arm | |
| 1953/63 | S-55 H-19 |  Marine Luchtvaartdienst | |
| 1956/68 | S-55 H-19 |  Suid-Afrikaanse Lugmag | |
| 1971- | Aviodome |
Global Distribution of HO4S-3 |
|
Construction Numbers |
| C/N | Year | History | |
|---|---|---|---|
| 55-885 | 1955 | 55885 | |
| 55-886 w/o 1961 | 1955 | 55886 | |
| 55-887 w/o 1958 | 1955 | 55887 | |
| 55-891 | 1955 | 55891 | |
| 55-892 w/o 1957 | 1955 | 55892 |
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