tenten Posted May 26, 2011 Share Posted May 26, 2011 We are attacked by the cycling of oil cooler flap during cruise, the cycling is taken place every 5 to 10 minutes (fully closed X fully opened), long time when I was lucky, the most was solved by replacing the temp control thermostat in these days and age it cost me three “shoots†to keep it calm. Appreciate any idea/tips/special ground check to avoid the ugly phrase “Defect Repeated THREEE timesâ€. Quote Link to comment Share on other sites More sharing options...
Lkuest Posted May 27, 2011 Share Posted May 27, 2011 Is oil temp staying within limits? Quote Link to comment Share on other sites More sharing options...
Steve1300 Posted May 27, 2011 Share Posted May 27, 2011 Are you using a different part number thermostat? There are new solid state units out that behave differently than what we are used to. Quote Link to comment Share on other sites More sharing options...
pjvr99 Posted May 27, 2011 Share Posted May 27, 2011 My feeling is a screwy solid state thermostat - had a number of similar over the years . . . . Quote Link to comment Share on other sites More sharing options...
tenten Posted May 27, 2011 Author Share Posted May 27, 2011 Oil temp during the cycling (as reported) within the normal range; once temp hits the 80 oil cooler then will take full open position, and as oil cooled and reach the 60, the cooler then will take the full closed position. Note: ignoring the cycling leads (in one case) for the actuator to fail; hence we got the message. Both types of thermostat are in used in our aircrafts with variety of parts numbers (most of them as I know solid-state types). Which part numbers or type caught on the act?.... I need to check defects history.(weekends Friday and Saturday on the HOT regions). Quote Link to comment Share on other sites More sharing options...
rdenn_58 Posted June 13, 2011 Share Posted June 13, 2011 We had a problem caused by the oil cooler flap actuator servo. When you tapped on it, intermittently the resistance would shoot through the roof. Quote Link to comment Share on other sites More sharing options...
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