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SA-342 Gazelle-How to fix exhaust temperature problem

Initial remark is vibrating temperature oscillation seen at exhaust temperature indicator at range from 50 to 300 C during the flight.For everyone who knows this type of engine it should be steady at 450 C.The engine RPM are fixed at 43500 which is excellent.The following procedure is check the RPM indicator.Done,  it is accurate.Next is to check the resistance of the wires at thermocouple system.Found to be 18,03 Ohms.Fixed at variable resistor and adjusted it at strictly 16.02 ohms.The serial numbers of thermocouple senders indicated that value.

When I have approached the connector and disassemble it I have found that the pins are loose and their connection to the wires are bad.

So after carefully inspection there is a one pin with signs of overheating others are too but this one is more than others.Procedure follows.

 Changing all four pins by new ones, Coat it carefully with thermo coater insulation , fixing the wires with clamps.Everything is now sure to be proven good and secure for flight.

The testing after confirms that  everything is solid.Temperature after the starting  engine phase is steady and at full RPM is 320 C .RPM are steady, Everything is ok for flight.


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Gazelle SA 341 SA 342 Torquemeter

The torquemeter is an unique instrument but so common at the helicopters.As the word say it measures the torque.Torque between main rotor and engine.It is one of the most important instruments.So here it is at the  test board attached . Then checking the zero point with the test device,it seems ok so far.

There you see the fixed zero point ad device prior the testing.                                                                                                                                                                                                                                       From the both sides of torque indicator there are holes where you can adjust the tolerance at 0% and 100%.

In case of using older version of device there are some tolerances to be inputed so this is the nearly fair good readings of maximum torque at SA 342.
This is the reading at 50%
How to connect the cables to Gazelle instalation.

This is the device itself fairly packed after testing.

At this…

Gazelle SA-341 SA-342 workshop

Gazelle SA-342 in the process of manufacturing to be as good as new

The process of overhauling is at the stage where SA-342 gets new paint after the old one is removed completely.The new wiring is placed.That all guarantees long and safe flight hours.