JT15D Engines Winter 2003
Pylon Cannon Plug
— Dan Arrick
On JT15D powered aircraft, it's always a good idea to clean and By Dan Arrick inspect the main cannon plug located at the pylon when given the opportunity. A good time to do this is during an engine change or when the inlet is removed for maintenance. It is most commonly done on early Citation 500 aircraft due to the soot in the cowling. A dirty cannon plug can produce discrepancies in the ITT, fuel flow and many other engine related systems.
Other items in the pylon to inspect during these opportunities are the starter generator wires, inlet anti-ice temp sensor and the fuel line to the low fuel pressure switch. Remember to take advantage of these times when components that normally are hard to see are exposed for a quick inspection. It may save an unexpected maintenance visit in the future.
For more information, please contact Ken Kuchenreuther or Dan Arrick at 800.525.2376.
Engine Cowl Seals
— Dan Arrick
Engine cowl seals play an important role in the operation of your JT15D engine. Their integrity is essential for fire protection, cleanliness of the engine and the great appearance of your aircraft. Probably the seal that needs the most attention is the lower cowl gain drain seal. This seal can deteriorate over time by the removal and reinstallation of the lower cowling for maintenance. If the seal is not working properly, oil venting from the engine breather tube can find its way into the lower cowling and over time develop into the appearance of an oil leak. This can also happen if the gang drain is not installed correctly. Also, be sure to inspect the pylon fire seals as required. Over time these seals can become brittle and develop holes.
For additional information, please contact Ken Kuchenreuther or Dan Arrick at 800.525.2376.
Commercial Support Program Information
— Dan Arrick
The Pratt & Whitney Commercial Support Program A97025 that replaces the Small Exit Duct and Shroud Segments on JT15D-5 series engines expires September 30th, 2003.
Local thermal stress (caused by hot air ingestion from the gas path) can develop cracks in the high turbine shroud segment support legs on the Small Exit Duct assembly. The Commercial Support Program action is to provide at a reduced cost to customers the new Shroud Segments, incorporating a lip at the forward edge, and the new Small Exit Duct assembly made from a higher strength material.
Be sure to read Commercial Support Program Notification A97025 for applicability to your engines.
For additional information, contact Ken Kuchenreuther in BTL at 800.525.2376.
Oil Consumption
— Ken Kuchenreuther
When chasing a suspected oil consumption problem on your JT15D, be sure to check the oil level 10 minutes after shutdown as recommended by the maintenance manual. In our experience at Duncan Aviation, we have found that the JT15D typically runs about one quart low or at the "ADD" mark on the dipstick.
For help with an oil consumption problem, please call Ken Kuchenreuther in BTL at 800.525.2376.
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