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OLC comment, MOP logging deactivated
On 5/23/20 8:29 AM, Tim Newport-Peace wrote:
At 19:23 22 May 2020, Dave Springford wrote: To expand upon Tim's note: ENL = Engine Noise Level MOP = Means of Propulsion IGC does not allow ENL to be used for electric or Jet engines, they must use MOP sensors. ENL may be used for gas powered engines. This is not a new change for the IGC, but I think the OLC has just implemented the change in their software. Many FES owners have been using ENL for years, but it is my understanding that this is no longer allowed by IGC as sufficient proof the FES was not used. Dave, Can you point to a current reference for IGC only allowing MOP sensors for FES please. SC3C says: 11.2ENL figures –engine on An ENL of over 700 is expected when the engine is running at climb power. Over 900 is typical for a two-stroke engine, and over 700 for a nose mounted 4-stroke. Values of 999 have been recorded with a two-stroke engine runningat full power, and over 900 for a Forward Electric System (FES) with the FR close behind it. These high ENLs are produced for a significant time during a climb and can therefore be attributed to engine running. SC3B says: 1.4.2EngineRecordingSystems - General. Enginerecording is by IGCENL and MOP systems that are designed to differentiate between conditions of forward thrust from the engine system, and gliding flight without the use of engine. The low frequency IGC Environmental Noise Level (ENL) system uses a sensor inside the FR and is most sensitive to acoustic noise between100and 200Hz. It was originally designed to record the operation of two-strokepistonengines, but may also record reasonable ENL numbers with Forward Electric Systems (FES) if the FR is installed just behind the engine and its retractible propeller (subject to testing to show this). Where the ENL system does not produce high enough readings with certain types of engine an d FR installations, either the FR location must be changed or an additional sensor under the MOP code must be fitted so that three high MOP numbers are produced in each IGC file fix line in addition to ENL. Difficult cases for Engine recording are in 1.4.2.2- 1.4.2.5 below, and more detailis in SC3Annex C (SC3C) Chapter 11, and Chapter 5 of the FR Specification. Which seems to be saying "Fit a MOP Sensor where ENL is not Satisfactory" it does not seem to be mandating it in all cases. Current OLC rules, dated Feb 23, say this: " Flights, which are performed with motorized gliders, have to be documented with a recording of the motor's operating time (ENL).. For aircraft with too low noise level, for example all aircraft with a front electric sustainer (FES), the MOP level must be recorded in addition to above." I just looked at a self-launching twin jet glider, its ENL values during the launch were only about 100. Wonder if OLC is going to be enforcing MOP for jets also? |
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