TPE-331 Start-up sequence

[baires_99]

I need your help to know how the TPE-331
engine start-up sequence is, and what
are the "N.T.S." and "HP Limit Test" for?
Thanks.

[Borrego]

TPE-331 Start-up sequence.

The High Power Monitor check is to make sure that the fuel computers are working correctly. If the aircraft fails this test one or both of the fuel computers is malfunctioning and you need to operate in manual mode.

The NTS (Negative Torque Sensing) check is essentially a check of the "Auto Feathering System" of the aircraft. It isn't exactly an autofeather but really pulses the prop between high & low pitch. This does help reduce drag significantly until the pilot can feather and secure the engine.

Hope these help,

Borrego

[Alvaro Gimenez]

Starting sequence for the 331 is relatively simple but varies according to the engine spec. ie. dash 5, dash 10 etc. and the airplane in which it is mounted. NTS or negative torque system senses the loss of power and will come close to feathering the prop. The actual feathering will have to be done by you. The horsepower limiting system limits the power output so that limits will not be exceeded, mostly on take-off. This is a very simple explanation to a more complex operation but I hope answers some of your questions.