tag:blogger.com,1999:blog-73593817085419531882024-03-13T22:02:44.042-07:00Gazelle SA341/342,Avionics, instruments,radio-radar and electro Miki O Bradhttp://www.blogger.com/profile/08310652124120089722noreply@blogger.comBlogger7125tag:blogger.com,1999:blog-7359381708541953188.post-70193721623102178102017-08-17T15:22:00.000-07:002017-08-26T03:19:49.178-07:00 Gazelle SA 341 SA 342 Torquemeter<div dir="ltr" style="text-align: left;" trbidi="on">
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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 .</div>
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Then checking the zero point with the test device,it seems ok so far.</div>
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There you see the fixed zero point ad device prior the testing. <a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjfKj93L5Z5jYKazfWFODO4Yf-q_6VQrD_eIoSNUk22cNVpJebuhw-JS12-J_d10iicPvCpG8jaRc8plr5iZPzAwTD2DwIky12eOKuNvUJZmpaO-X7FcQWKl-Fo75ONWQpE1Wcxy3OoqXg/s1600/tork.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjfKj93L5Z5jYKazfWFODO4Yf-q_6VQrD_eIoSNUk22cNVpJebuhw-JS12-J_d10iicPvCpG8jaRc8plr5iZPzAwTD2DwIky12eOKuNvUJZmpaO-X7FcQWKl-Fo75ONWQpE1Wcxy3OoqXg/s320/tork.jpg" width="240" /></a></div>
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From the both sides of torque indicator there are holes where you can adjust the tolerance at 0% and 100%.</div>
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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.</div>
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This is the reading at 50%</div>
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How to connect the cables to Gazelle instalation.</div>
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This is the device itself fairly packed after testing.</div>
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At this picture you can see the test device up too 120 %</div>
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.It is used to test torque indicator and sender for SA 341 and SA 342 Gazelles</div>
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and following pictures are showing the test device for PCB of Torquemeter sender </div>
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and the PCB's inside Indicator and sender that can be overhauled as well.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiIVhYKRUjTEmCGGmtDisU4pRFdnBVpbkQBOvsSemoeXt1qEKUskiONaPZX6Ds3rvKP2qzaL2YafMc5yaqzvzV4yWa9Bpi42T8XSYZDNXrb3dRtyXfaEnuHpvyvl-UgR0HRXY_QQl15sgk/s1600/torkdelovi.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="219" data-original-width="450" height="155" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiIVhYKRUjTEmCGGmtDisU4pRFdnBVpbkQBOvsSemoeXt1qEKUskiONaPZX6Ds3rvKP2qzaL2YafMc5yaqzvzV4yWa9Bpi42T8XSYZDNXrb3dRtyXfaEnuHpvyvl-UgR0HRXY_QQl15sgk/s320/torkdelovi.jpg" width="320" /></a></div>
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Miki O Bradhttp://www.blogger.com/profile/08310652124120089722noreply@blogger.com0tag:blogger.com,1999:blog-7359381708541953188.post-62645035728849174762017-08-10T13:19:00.001-07:002017-08-17T15:21:41.028-07:00SA 342 Gazelle Maximum Speed<div dir="ltr" style="text-align: left;" trbidi="on">
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<iframe allowfullscreen="" class="YOUTUBE-iframe-video" data-thumbnail-src="https://i.ytimg.com/vi/o3ekhWFWt8I/0.jpg" frameborder="0" height="266" src="https://www.youtube.com/embed/o3ekhWFWt8I?feature=player_embedded" width="320"></iframe></div>
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This is the part of the test flight after C inspection and during the video you will see at 1.25 min the maximum speed of 310 km/h.Enjoy it like I was during the work and at this beauty and after that at the flight it self. </div>
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Miki O Bradhttp://www.blogger.com/profile/08310652124120089722noreply@blogger.com0tag:blogger.com,1999:blog-7359381708541953188.post-8914029207455215142016-10-19T09:36:00.001-07:002017-02-27T12:15:06.130-08:00 SA-342 Gazelle-How to fix exhaust temperature problem<div dir="ltr" style="text-align: left;" trbidi="on">
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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.</div>
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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.</div>
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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.</div>
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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.</div>
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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.</div>
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Miki O Bradhttp://www.blogger.com/profile/08310652124120089722noreply@blogger.com0Scandinavia63.074865690586634 12.48047074999999554.471932190586635 -8.1738262500000047 71.67779919058664 33.134767749999995tag:blogger.com,1999:blog-7359381708541953188.post-53623062145020552552016-04-29T03:34:00.002-07:002017-02-08T12:46:47.639-08:00Pitot Tube<div dir="ltr" style="text-align: left;" trbidi="on">
Pitot tube is the sender of data for barometric instruments and for many other devices.There is an option at these devices that pressure is converting to voltage through the computer.<br />
The pitot tube at Gazelle SA-341,SA-342 will be explained here.<br />
Pitot tube is placed just under the cabine and is is collecting P1 pressure which is consisting from mostly dynamic component and slightly from static.Static component is collecting from two holes placed under the gearbox and engine from both sides of the frame.<br />
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Pitot tube components are :</div>
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Pressure tube ( 2 ) rilsan,</div>
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adapter ( 1)</div>
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holder ( 3)</div>
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drainage (4 )</div>
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montage holder ( 7 )</div>
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adapter ( 8 )</div>
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Pitot tube with the heater</div>
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Heater is necessary device and it is preventing pitot tube from freezing at the same time it ensures good air flow during the cold temperatures.It has its own limitation for work.Each manufacturer has its own and it must be at the manual noted.</div>
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There is a complete scheme for connecting it </div>
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At 7 alpha there is a detector and it is pitot warning light controller.During the freezing if the warning light is on and the switch is on,That is a information for the pilot that he must pay attention at speedometer.</div>
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</script>Miki O Bradhttp://www.blogger.com/profile/08310652124120089722noreply@blogger.com0tag:blogger.com,1999:blog-7359381708541953188.post-84480509249433577012016-04-10T11:59:00.003-07:002017-02-08T12:47:02.348-08:00Avionics for Airplanes and Helicopters general<div dir="ltr" style="text-align: left;" trbidi="on">
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<span style="font-family: "georgia" , "times new roman" , serif;"><span style="font-weight: normal;">Avionics in general means all electronic,electric and instrumental equipment that are placed into the airplane or helicopter.Thus it consists from many branches.The first one will be the instruments.</span><br /><span style="font-weight: normal;">Instruments at the airplane or the helicopter are used for measuring and controlling various parameters during the ignition of the engine and during the flight.We can divide them into following groups.</span></span></h3>
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<span style="font-family: "georgia" , "times new roman" , serif;"><i>Barometric instruments</i></span></h3>
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<span style="font-family: "georgia" , "times new roman" , serif; font-weight: normal;">Flight speed indicator,Altitude indicator,Variometer.All of them are powered by air pressure static or dynamic component or both of them.</span></h3>
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<span style="font-family: "georgia" , "times new roman" , serif; font-weight: normal;"><b><i>Instruments for controlling the parameters of the engine</i></b></span></h3>
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<span style="font-family: "georgia" , "times new roman" , serif; font-weight: normal;">Engine RPM indicator,Main rotor RPM indicator,various temperature controllers for working temperature of components. Exhaust temperature controller everything is combined with such a fine automatics and is very reliable indeed.Shaft controllers, torquemeter they are all obliged to give a correct data to the flying crew.</span></h3>
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<span style="font-family: "georgia" , "times new roman" , serif; font-weight: normal;"><i><b>Navigation instruments</b></i></span></h3>
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<span style="font-family: "georgia" , "times new roman" , serif; font-weight: normal;">Flight compass,Gyrocompass,Gyro horizon or artificial horizon plus rate of turn indicator and many others for secure navigation during the flight.</span></h3>
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<span style="font-family: "georgia" , "times new roman" , serif; font-weight: normal;"><i>Electric equipment for airplanes</i></span></h3>
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<span style="font-family: "georgia" , "times new roman" , serif; font-weight: normal;">This area consists from two main parts</span><span style="font-family: "georgia" , "times new roman" , serif; font-weight: normal;"><i><b><br /></b></i></span></h3>
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<span style="font-family: "georgia" , "times new roman" , serif; font-weight: normal;"><i>DC distribution</i></span></h3>
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<span style="font-family: "georgia" , "times new roman" , serif; font-weight: normal;">The main DC source is starter- generator or just generator if engine uses air pressure for starting.Auxiliary source is battery. Through various converters it converts DC into AC if there is a malfunction in main network.Mainly voltage is 28 v but at light and ultra light airplanes it is 14 V.There is also a large network of commutative equipment with voltage regulators and differential minimal relays included and many more regulators like exhaust temperature regulator during the starting phase of the engine.Various types of relays from 0,1 to 2000 amps.</span></h3>
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<span style="font-family: "georgia" , "times new roman" , serif; font-weight: normal;"><i>AC distribution</i></span></h3>
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<span style="font-weight: normal;"><span style="font-family: "georgia" , "times new roman" , serif;">Alternator is the main source of AC, voltage is mostly 208 V 400 Hz,115 v 400 Hz, through various transformers it can be 26 V 400 Hz or 36 V 400 Hz at russian types.Supplying many instruments for navigation, engine monitoring etc.Radio equipment also uses AC for work too.Secondary source is battery through the network of static converters and transformers .</span></span></h3>
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<span style="font-weight: normal;"><span style="font-family: "georgia" , "times new roman" , serif;">Radio and Radar Equipment</span></span></h3>
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<span style="font-weight: normal;"><span style="font-family: "georgia" , "times new roman" , serif;">This term include all devices for radio comm and all types of radars like weather or combat types.Also to navigate airplane to the start and middle point of runway for landing through the network of VOR-s.</span></span><span style="font-weight: normal;"><span style="font-family: "georgia" , "times new roman" , serif;"> </span></span></h3>
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<span style="font-weight: normal;"><span style="font-family: "georgia" , "times new roman" , serif; font-weight: normal;"><br /></span></span><span style="font-family: "georgia" , "times new roman" , serif;"><b><i><br /></i></b></span></h3>
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Main gearbox is the crucial connection between Astazou engine, frame, the main rotor and tail rotor.This work of tech ingenious art is carrier of the hydro pack as well.There is a RPM sender inside it and you can see rotor rpm-s at the inside scale of tachometer at the instrumental board .At the side of main gearbox is also place for low oil pressure sender.Everything is here at this video.</div>
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Miki O Bradhttp://www.blogger.com/profile/08310652124120089722noreply@blogger.com1tag:blogger.com,1999:blog-7359381708541953188.post-18289262018099396072016-04-10T10:42:00.001-07:002017-02-08T12:40:22.567-08:00Gazelle Turbomeca Astazou III B engine complete insight<div dir="ltr" style="text-align: left;" trbidi="on">
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The complete insight of Turbomeca Astazou III B engine</div>
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