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Engine Cone Paint  
User currently offlineModesto2 From United States of America, joined Jul 2000, 2898 posts, RR: 5
Posted (15 years 9 months 2 weeks 1 day 1 hour ago) and read 2489 times:

Why is there a spiral pattern painted on the cone (center of fan) of an engine? Some aircraft have this paint while others do not. What is its purpose? Thanks.

4 replies: All unread, jump to last
User currently offlineIahcsr From United States of America, joined Jun 1999, 3766 posts, RR: 40
Reply 1, posted (15 years 9 months 2 weeks 1 day ago) and read 2471 times:
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I have been told that it's to scare birds away.

Working very hard to Fly Right....
User currently offlineDeltaRNOmd-80 From , joined Dec 1969, posts, RR:
Reply 2, posted (15 years 9 months 2 weeks 1 day ago) and read 2460 times:

I was seated near the rear of a DL md-90 and saw this yellow spiral as I looked back at the engine. Probably so they can tell how fast the fan is spinning by looking at the spiral, or to scare birds away.

User currently offlinePmk From United States of America, joined May 1999, 664 posts, RR: 2
Reply 3, posted (15 years 9 months 2 weeks 23 hours ago) and read 2454 times:

The little swirl is there for two reasons:

1.To scare birds away
2.In some situations it is difficult to tell when an engine is spinning and when it's not, look at the center, if you see the swirl it's not moving, if you see a blur, it is.

This question has been asked and answered MANY times, please search before posting questions.


User currently offlineExPratt From United States of America, joined Mar 2000, 311 posts, RR: 0
Reply 4, posted (15 years 9 months 2 weeks 22 hours ago) and read 2440 times:

JAL did a study with its 747s having some airplanes with engine spinners that were painted black and some airplanes with spinners painted with the spiral pattern. The different airplanes were operated on similar routes. JAL's study clearly showed that the airplanes with spiral-painted spinners had fewer birdstrikes. The irony is that despite its test results, JAL did not paint its remaining spinners.

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