GM = Gulf Modification are aircraft given a cooling package for use in hot countries / areas such as the Persian Gulf during Iran / Iraqi war, an improved ECM, revised IFF and provision for Forward looking infrared (FLIR). 13 HAS.3GM helicopters were converted to HAS.3SGM. S = secure speach) and a further 4 HAS.3S aircraft were converted to HAS.3SGM 
List of Operators of Lynx HAS3SGM |
| Years | Model | Org | |
|---|---|---|---|
| 1976/17 | Lynx |  Fleet Air Arm |
Construction Numbers |
| C/N | Year | History | |
|---|---|---|---|
| 002 | 1976 | XZ228 | |
| 004 | 1976 | XZ229 | |
| 005 w/o 1998 | 1976 | XZ230 | |
| 009 | 1976 | XZ232 | |
| 064 w/o 1989 | 1978 | XZ244 | |
| 135 | 1979 | XZ696 | |
| 166 | 1980 | XZ720 | |
| 186 w/o 2004 | 1980 | XZ724 | |
| 257 w/o 2001 | 1982 | ZD253 |
