Engine Gauge Markings

·         Michael Forhan

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What are the yellow, red and green engine gauge markings, based on the latest maintenance manual?

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·         Doug Smith

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Hi Michael,
Red markings are limits: not to be exceeded. Yellow are precautionary ranges - so you can be in that range but there might be a time or operational limit attached to them.
In terms of where the markings should be for your aircraft / engine it does depend on the model and category of the aircraft: if you let me know those details I can check the exact values for you.
Regards,
Doug.

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·         Michael Forhan

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Thanks for the reply. I have a hydraulic lifter 2200A installed in a RANS S-6ES experimental aircraft. I'd appreciate a description or photos. For example, should oil pressure be green from 11-51 PSI with red below and above the green range?

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·         Doug Smith

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Looking at the manual, 11psi is the minimum so there should be a red line there. My understanding is that for your situation there will be a yellow arc between 51 and 76psi - so occasional pressures above 51 (and below 76) should be limited but won't do any immediate harm.
D.