TSLM - Turbine Start Limit & Monitor

TSLM7 unit image

The TSLM brings auto-start control to gas-turbine engines equipped with electric fuel valves such as the Walter/GE M601 providing a simple and consistent platform to execute start procedures from. It not only lessens operator workload, but enables start-ups using just one hand on the condition/fuel lever, while the other hand can hold the flight control stick, etc.

For the M601 engine it does not only control the start-up at the flick of a switch, but it limits against ITT over-temperatures as well as excessive ITT rate-of-change during the start sequence, and in-flight it limits against propeller over-speeds when in beta (reverse thrust) mode.

Initiating a start the operator is guided by one light only, the Exceed light. Illumination of the Exceed light tells the operator to abort the start, which can be because the TSLM predicts a hot-start to be imminent or otherwise senses the existence of an unsafe condition.

In-flight the Exceed light also illuminates should any primary engine parameter (ITT, torque, NG/N1, NP/N2) exceed. The operator can then make the necessary adjustment to the power or prop lever to let the light to go out.

For normal standalone auto-starting only certain sensors need to be connected to the TSLM. The unit will however accept further sensors in order to work with one or more of our VRX displays to realize full engine monitoring. This arrangement can also provide some instrumentation redundancy against a single unit failure, however rare to occur, to at least leave the operator enough engine indication to "limp home" with.

The TSLM can record all engine parameters in up to 1/10th of a second sample periods. Recordings can be continuous, or triggered to only cover certain events such as parameter exceeds and start sequences.

The TSLM easily retrofits to existing installations, requiring very little instrument panel alteration.



VRX E1 screen VRX TSLM screen

A series 5000 (or later) TSLM can combine with one or more VRX display for in-cockpit engine monitoring. This combination adds the following via the display(s):