Originally Posted by
Boyington
For CFM 56 engines in the Engine Relight Section of the QRH it states Windmill Quick Relight if N2 >12%. whereas for LEAP engine, it states Windmill Quick Relight t < 20 s. What does T < 20 S mean.
Thanks
Not flying/doing SIMS on the NEOs but I have access to the manuals and my take is the answer could be in the FCOM - PRO - ABN - ENG RELIGHT note at the bottom.
Note:
For an in-flight restart, the FADEC decides whether the rotor speed is sufficient to perform a windmill relight or needs assistance from the starter in view of the current engine parameters and the flight environment parameters. Within the windmill quick relight envelope, if the crew is using the Quick Windmill Relight procedure, the FADEC will restart the engine after the flight crew cycles the ENG MASTER lever from "ON" to "OFF" then back to "ON".
Possibly this cycle has to be within 20 seconds to use the Quick Windmill Relight ?