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
Airframes (9)
| C/N | Model | Built | Reg | |
|---|---|---|---|---|
| 002 | has.2 | 1976 |  XZ228 | 407 |
| 004 | has.2 | 1976 | XZ229 | |
| 005 | has.2 | 1976 | XZ230 | 751-VL |
| 009 | has.2 | 1976 | XZ232 | 332 |
| 064 | has.2 | 1978 | XZ244 | 343 |
| 135 | has.2 | 1979 | XZ696 | |
| 166 | has.2 | 1980 | XZ720 | 410-GC |
| 186 | has.2 | 1980 | XZ724 | 336-CV |
| 257 | has.3 | 1982 | ZD253 | 304 |
Operators
| 1976-2017 | Fleet Air Arm Lynx |