| ASCC17-27C-218 | 99237 | AIRFORCE-NAVY AERONAUTICAL DESIGN STANDARD |
| BS1806-218 | K7766 | BRITISH STANDARDS INSTITUTION |
| UX16916 | K5086 | ROLLS-ROYCE POWER ENGINEERING PLC (ROLLS-ROYCE & ASSOCIATES) |
| UX16916/RRA | K5086 | ROLLS-ROYCE POWER ENGINEERING PLC (ROLLS-ROYCE & ASSOCIATES) |
| BSM48-218 | K7766 | BRITISH STANDARDS INSTITUTION |