Talk:Foreign object damage

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FOD is a slang term (new)... can't figure out what it means.. surprised to see it not listed here....

Contents 1 concorde 2 debris 3 Construction 4 Why not have some kind of grating over the intakes of a jet engine?

[edit] concorde

hi folks,

just a comment from a german wiki-man: how about adding the concorde crash at paris as an example? Regards, Andreas

Done. Akradecki 20:14, 21 March 2007 (UTC)

[edit] debris

FOD also stands for a related term, Foreign Object Debris. For example at the air force base where I work there are signs advising people to "Check Shoes for FOD".

That's what I was thinking. Will see how to add it to the article. user:justfred

[edit] Construction

Noticing in pictures of the F-35 being built caution tape reading "FOD CRITICAL ZONE" http://ueba.net/hosted_pages/F-35-Joint-Strike-Fighter?2

So the term FOD seems to apply to construction too, not just operations.

[edit] Why not have some kind of grating over the intakes of a jet engine?

The grating mesh would prevent large objects like birds from getting sucked into the intake. Malamockq 03:26, 7 March 2007 (UTC)

1) The grate itself would impede airflow. 
2) If a bird impacted the grate, it would probably stick impeding air flow. 
3) Other debris can get caught, build up and impede airflow. 
#1 might be solved through engineering.  
#2 & #3 would cause loss of power and could be as much of a problem as the FOD. 169.3.168.209 15:31, 21 March 2007 (UTC)

Actually, jet engines used on some helicopters (like the Bell 222U and Bell 412 that I work on) do have screens over the inlets, and even with that we occasionally have problems with FOD ingestion. The smallest piece of safetywire, a rivet tail, or cotterpin can trash a turbine engine. Besides the screens, on our engines and on some turboprop engines, especially those with reverse flow like the PT-6A, there is a particle seperator system designed in so that debris heavier than air takes a different route and gets expelled, rather than ingested. And even then we have problems...I've just added a photo of FOD (the damage, not the debris) in a helicopter engine. Akradecki 20:14, 21 March 2007 (UTC)