The Type of aircraft engine is designated from the following picklist maintained by the FAA:
0 - None
1 - Reciprocating
2 - Turbo-prop
3 - Turbo-shaft
4 - Turbo-jet
5 - Turbo-fan
6 - Ramjet
7 - 2 Cycle
8 - 4 Cycle
9 – Unknown
10 – Electric
11 - Rotary

We present only the text since the alphanumeric abbreviation is largely used only by aircraft professionals.