| 16M2916 | U1725 | MINISTRY OF DEFENCE AIR DOMESTIC R FERENCE NUMBER USE ONLY |
| 17-27B | 99237 | AIRFORCE-NAVY AERONAUTICAL DESIGN STANDARD |
| A83291-43 | K1631 | WESTINGHOUSE BRAKE & SIGNAL CO LTD |
| BS1806-433 | K7766 | BRITISH STANDARDS INSTITUTION |
| BSM48-433 | K7766 | BRITISH STANDARDS INSTITUTION |