Thrush Aircraft S2R–T660 Maintenance Manual page 28

The graduations on the dipstick indicate the oil level in U.S. quarts
below maximum capacity of the oil tank. The normal cold oil level is the
Maximum Cold mark on the dipstick. The normal hot level is Maximum
Hot mark on the dipstick. A dipstick reading of 3 will indicate that the
system requires 2 U.S. quarts to replenish to normal level if the oil is
cold. If the oil is hot, it will take 3 U.S. quarts to replenish.
3. If the engine is nose high or nose low, compensation must be made to avoid over or
under servicing.
B. If the oil level is too low to register on the dipstick due to possible excessive consumption or if
low or fluctuating pressures have been recorded, refer to Troubleshooting - Lubrication
Problems in the Pratt and Whitney Maintenance Manual for the action to be taken. After that
has been accomplished, proceed as follows to check the oil level.
1. Fill the oil tank to the appropriate normal level. Record the quantity of oil added to
the system.
2. Install the filler cap and dipstick. Ensure that the cap is locked securely.
3. Run the engine idle for approximately 5 minutes.
4. Check the oil level.
5. Check the oil filter per applicable Pratt & Whitney Maintenance Manual.
C. On engines which have remained stationary for a period of 12 hours or more, proceed as follows
to check the oil level.
1. Start the engine and run at idle speed for a minimum of 2 minutes.
2. Feather the propeller.
3. Shut down the engine.
4. Check the oil level.
D. Recommendations for oil change intervals are based on the performance of specific brands of
oil, specific types of oil, specific engine models, and specific operating criteria. General oil
change intervals may be extended periodically and will be reflected by revisions to the Pratt
and Whitney Engine Service Bulletin 13001. Permission for extension of oil drain intervals may
be granted to operators through monitoring programs, which are conducted by most
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THRUSH AICRAFT INC - T660 TURBO THRUSH
AIRCRAFT MAINTENANCE MANUAL
* NOTE *
Effective: 12/17/03