| 5UC8684 | U1725 | MINISTRY OF DEFENCE AIR DOMESTIC R FERENCE NUMBER USE ONLY |
| C10 | K7766 | BRITISH STANDARDS INSTITUTION |
| DEFSTAN53-13 | K0851 | MINISTRY OF DEFENCE DIRECTORATE OF STANDARDIZATION STAN 1 |
| NK25221 | K4358 | SAFRAN ELECTRICAL & POWER UK LTD |
| SP40 | K7766 | BRITISH STANDARDS INSTITUTION |
| SP40-C10 | K7766 | BRITISH STANDARDS INSTITUTION |
| SP40C10 | K7766 | BRITISH STANDARDS INSTITUTION |