Thanks for replies. Interesting points made.
Awo157. You said:
The static RPM in the flight manual is (from memory) 2215-2315RPM. I would imagine this range would take into account a Cruise v Climb prop, as there is no reference made with those figure of leeway for either type of prop.
In fact this range you mentioned does not take into account a cruise versus climb prop as they are very different figures. The minimum static rpm is not the same for all Cessna's. If the particular aircraft has a cruise propeller installed, the Flight Manual for that aircraft will have a Supplement at the back of the FM which includes the minimum static rpm for that specific propeller installation. For a cruise prop I believe the min static rpm is relatively low at around 2050-2100 - but like I said, check the Supplement.
On the other hand the normal propeller min static is in the general range from 2280-2380. Before you fly any aircraft with a fixed pitch prop the pilot should carefully note the published min static rpm especially if the operator has failed to advise that the aircraft may have a cruise prop. That info is found sometimes in the Flight Manual under Limitations or in the POH same place. It should also be remembered that the published minimum static rpm is based on carb heat off and mixture control leaned to maximum rpm.
With regard to oil temp in the green arc before applying take off power, there is no operational requirement for this and in cold weather it is quite normal for the oil temperature to not be in the green arc until well into the climb after take off.
Further to that point, if you read page 4.23 (Cold Weather operation)of the Cessna Model 152 Information Manual published by the Cessna Aircraft Company it may be of interest that:
Quote: "During cold weather operations, no indication will be apparent on the oil temperature gage prior to take off. After a suitable warm up (2 to 5 minutes at 1000rpm) accelerate the engine several times to higher rpm. If the engine accelerates smoothly and oil pressure remains normal, the airplane is ready for take off."
There is no published Limitation in the Cessna 152 POH regarding minimum oil temperature for take off but there is a maximum oil temp of 245F.
There certainly is no requirement to monitor the engine oil pressure and oil temperature during the take off run. On the contrary the pilot should be concentrating on keeping straight on the take off run especially if a strong crosswind is apparent. The time to check these engine parameters is during the run-up procedure.
