| Acronym | Meaning |
 | NR | Proprotor Speed (rpm) |
| LSI | Large Scale Integrated Circuits |
| SSFC | Solid State Frequency Changer |
| TD | Training Device |
| GAFC | General Airframe Change (tdc 71) |
| ARM | Anti Radiation Missile |
| SPS | Software Porduct Specification |
| UDATS | Diver Underwater Tv System |
| NOTAL | Not To All |
| YF | Covered Lighter (self-propelled) |
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