| Chapter Code | Chapter Description |
|---|
| 840820 | ENGINES OF A KIND USED FOR THE PROPULSION OF VEHICLES OF CHAPTER 87 |
| 840910 | FOR AIRCRAFT ENGINES |
| 840991 | VALVES, INLET & EXHAUST, PISTON, PISTON RINGS, PISTON ASSEMBLIES |
| 841011 | OF A POWER NOT EXCEEDING 1,000 KW |
| 841012 | OF A POWER EXCEEDING 1,000 KW BUT NOT EXCEEDING 10,000 KW |
| 841013 | OF A POWER EXCEEDING 10,000 KW |
| 841111 | TURBO-JETS |
| 841121 | TURBO-PROPELLERS |