| 5UC7398 | U1725 | MINISTRY OF DEFENCE AIR DOMESTIC R FERENCE NUMBER USE ONLY |
| A6 | K7766 | BRITISH STANDARDS INSTITUTION |
| DEFSTAN53-13 | K0851 | MINISTRY OF DEFENCE DIRECTORATE OF STANDARDIZATION STAN 1 |
| NK25207 | K4358 | SAFRAN ELECTRICAL & POWER UK LTD |
| SP40 | K7766 | BRITISH STANDARDS INSTITUTION |
| SP40-A6 | K7766 | BRITISH STANDARDS INSTITUTION |
| SP40A6 | K7766 | BRITISH STANDARDS INSTITUTION |