Topics in Category: Garrett TFE731 - Rotate.Aero Sun, 16 Jun 2019 12:40:20 +0000 MYOB /media/kunena/images/icons/rss.png Topics in Category: Garrett TFE731 - Rotate.Aero en-gb ATA 30-20, Nacelle Anti-Ice - by: Mark
The important aspect of this system is the fact that the valve's solenoid is powered "on" to keep the valve closed. Which means the solenoid gets very hot with the aircraft sitting on the ground using external power. This valve is a no-go item on most aircraft. With the engine running (on the ground), the maximum time for having nacelle heat on is 10 seconds. Any longer...... the nacelle turns a pretty shade of blue as the hot air quickly overheats the metal.

The pressure switch used for indication comes off a "T" fitting downstream from the valve. (This one is shown with the cannon plug off)

If the "NAC" light is illuminated during or after engine start, the crew should immediately shut down the engine. (20 PSI is all that is needed to make the switch.)

Some corporate operators make a practice of pulling certain circuit breakers for ground maintenance. Including the nacelle heat breakers to that group is a good idea.

ATA 30 Ice/Rain Protection Wed, 29 Nov 2017 02:09:37 +0000
ATA 79-31, Oil Pressure Indication - by: Mark Cessna 550 Bravo Chapter 79 for oil pressure troubleshooting.]]> ATA 79 Oil Fri, 09 Jun 2017 01:51:49 +0000