Just wondering whether anyone can tell me a little bit about the function of an 'Oil Filter Caution light' in general aviation aircraft such as a C206.
The flight manual suggests that the light will come on when the filter bypass valve opens but doesn't go into anymore detail than this and unfortunately I don't have access to a copy of the maintenance manual.
I've been told that the light is activated due to pressure differential, and what I am curious about is how critical this type of warning is, whether there is a period where it may still be safe to fly (ie. get it checked within 'X' hours, or whether its a matter of don't fly it until its checked)
I was advised by the engineer who usually looks after the aircraft that the plane wasn't unsafe (via telephone - engineer hadn't seen it since the last check), however another engineer (who I know has significant experience with these engines) mentioned that these warning lights don't often illuminate and if it has it could be a sign of impending trouble and that it should be checked before flying.
I know the other possibility is an electrics fault - and I'm sure this will be checked first - however I am curious how an engineer would recommend a pilot deal with an 'oil filter light' warning.
Background:
- Temps & pressures were normal but the engine was only run for a short period of time.
- Apparently the light had flickered a few weeks ago but had come on solidly within the last couple of weeks (only flies a few hours a week)
- Engine was overhauled a year ago & is still being run on straight oil
Look forward to any feedback!