Meaning of N2 | Babel Free

Definitions

The rotational speed of the high-pressure spool of a two-spool gas turbine engine or the intermediate-pressure spool of a three-spool gas turbine engine, expressed as a percentage of a certain reference rotational speed.

Examples

“The inputs into the computerized JT9D condition monitoring program⟳ for this engine from September 10 through 16 likewise reflected adverse changes in trends of vital operating parameters which were indicative of the possibility of a serious engine malfunction. These data points showed a progressive increase⟳ of EGT and fuel flow⟳ while N2 showed a progressive decrease over the same period of time.”

“A test⟳ to evaluate⟳ the slight increases (25 to 30 pounds per square inch gauge [psig]) in core-driven hydraulic pump pressure indications showed that hydraulic pump pressure would begin⟳ to indicate⟳ on the FDR with about 35 rpm of core rotation. Another test⟳ showed that N2 signals would begin⟳ to indicate⟳ on the FDR and in the cockpit with about 70 rpm of core rotation.”

CEFR level