Improved ASW version of Wessex HAS.1 with more powerful 1,600 shp NGa.18 Mk.165 Napier Gazelle turboshatft engine. Three prototypes built and 42 conversions from HAS.1. 
During 1965, Rolls Royce bought out the Napier engine company (manufacturers of the Gazelle), which resulted in a shortage of engine spares and subsequent problems with Wessex operations on HMS Bulwark and HMS Kent.
Specifications Wessex HAS.3 |
List of Operators of Wessex HAS.3 |
| Years | Model | Org | |
|---|---|---|---|
| 1956/?? | Wessex |  Ministry of Defence (MoD) | |
| 1958/80 | Wessex | Westland | |
| 1961/88 | Wessex | Fleet Air Arm |
Global Distribution of Wessex HAS.3 |
|
Construction Numbers |
| C/N | Year | History | |
|---|---|---|---|
| wa 8 scrapped 1996 | 1959 | XM327 | |
| wa 9 | 1959 | XM328 | |
| wa 14 | 1960 | XM833 | |
| wa 15 w/o 1970 | 1960 | XM834 | |
| wa 17 scrapped 1991 | 1961 | XM836 | |
| wa 18 w/o 1982 | 1961 | XM837 | |
| wa 19 scrapped 1995 | 1961 | XM838 | |
| wa 25 w/o 1976 | 1961 | XM844 | |
| wa 29 scrapped 2007 | 1961 | XM870 | |
| wa 30 w/o 1975 | 1961 | XM871 | |
| wa 31 w/o 1981 | 1961 | XM872 | |
| wa 40 scrapped 1984 | 1961 | XM919 | |
| wa 41 w/o 1968 | 1961 | XM920 | |
| wa 44 | 1961 | XM923 | |
| wa 48 scrapped 2003 | 1962 | XM927 | |
| wa 54 w/o 1970 | 1962 | XP103 | |
| wa 55 w/o 1972 | 1962 | XP104 | |
| wa 56 w/o 1978 | 1962 | XP105 | |
| wa 61 w/o 1978 | 1962 | XP110 | |
| wa 70 | 1962 | XP137 | |
| wa 75 | 1962 | XP142 | |
| wa 83 | 1962 | XP150 | |
| wa 86 w/o 1969 | 1962 | XP153 | |
| wa 89 w/o 1980 | 1962 | XP156 | |
| wa 98 scrapped 1992 | 1963 | XS119 | |
| wa100 w/o 1972 | 1963 | XS121 | |
| wa101 | 1963 | XS122 | |
| wa105 w/o 1969 | 1963 | XS126 | |
| wa108 | 1963 | XS149 | |
| wa112 | 1963 | XS153 | |
| wa239 scrapped 1996 | 1964 | XT255 | |
| wa240 | 1965 | XT256 | |
| wa241 | 1965 | XT257 | |
| wa242 scrapped 2010 | 1965 | XS862 |
