Airframe Fuel Filter Maintenance Interval

[PT6ER]

I am working on a new airframe mounted fuel filtration project (on an older airframe) and I'm trying to get an idea of what the interval between element changes are for both fixed wing and rotary wing gas turbine installations. Do the OEMS specify an interval or is the impending bypass light / turkey popper the instigator of an element change.

We have tasked the filter supplier with a min time to hit but that is at worst case contamination so any information based on real world experience would be much appreciated.

Many Thanks

[bish-bash]

Filters inspected when bypass message annouciated on cas page between A2 checks.

Filters are replaced on each A2 check (800 hr intervals) on P & W 119, hope this helps.