TB20 MAINTENANCE MANUAL 12 SERVICING TB20飞机维护手册 12 保养(21)

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To replace the oil and the filter or filtering cartridge of new, remanufactured or recently overhauled engines as well as of engines on which cylinders have been installed recently, refer to TEXTRON LYCOMING Service Bulletin No. 480 at the latest revision.
Afterwards, drain the engine oil sump and replace the filter or filtering cartridge every 50 hours or sooner under unfavourable conditions. Engine oil is changed with the filter or filtering cartridge. Change the engine oil and replace the filter or filtering cartridge at least every 4 months even if the recommended operating hours have not been reached. Reduce intervals for prolonged operation in dusty areas, cold climates, or in case of flights followed by long periods of non operation which can result in sludging.
The oil is stored in the oil sump located below the engine. A quick-drain valve, located below the oil sump, allows draining. An inspection door, located on the upper engine cowling, provides access to the filler cap / dipstick.
The oil system servicing operations are the following :
- oil filling - refer to 12-12-01,
- oil drainage - refer to 12-12-02.
2. CAPACITY - CONSUMPTION
NOTE : The oil level is checked with pre-heated engine. NOTE : The dipstick is graduated in U.S. quarts.
Oil sump capacity : 12 U.S. qt (11.3 litres)
Total system capacity : 13.3 U.S. qt (12.6 litres)
Oil maxi consumption : 1 U.S. qt (0.95 litres)

Do not operate the engine when oil quantity is inferior to 6 U.S. qt (5.7 litres). To minimize loss of oil through breather, fill to 9 U.S. qt (8.5 litres) for normal flights of less than 3 hours. For extended flights, fill to 12 U.S. qt (11.3 litres). These quantities correspond to oil dipstick level readings. During oil and filter or filtering cartridge changes, 1.3 additional U.S. qt (1.2 litres) is required for the filter or filtering cartridge.
 
3. GRADE AND VISCOSITY IN RELATION TO TEMPERATURE
CAUTION : IT IS STRONGLY RECOMMENDED TO USE DISPERSANT OILS FOR ALL ENGINES.
IT IS ESSENTIAL NOT TO CONFUSE "DETERGENT" AND "DISPERSANT" TERMS. IN FACT, DETERGENT OILS MAY CAUSE SEPARATION OF THE CARBON DEPOSITS WHICH CAN OBSTRUCT THE INTERNAL OIL SYSTEMS. DISPERSANT OILS PREVENT THE FORMATION OF DEPOSITS BY BRESHING UP THE CARBON DEPOSIT PARTICLES, THUS ELIMINATING THE RISKS OF SEIZING.
SINCE PURE MINERAL AND DISPERSANT OILS ARE MISCIBLE, IT IS POSSIBLE, AS A TEMPORARY MEASURE, TO FILL UP WITH A DIFFERENT GRADE OF OIL.
Outside
Air
Temperature MIL.L.6082
Mineral grades
First 50 hours MIL.L.22851 C
Dispersant grades
After 50 hours
All temperatures  SAE 15W50 or 20W50
(TB 03-903)
Above 27°C (80°F) SAE 60 SAE 60 (TB 03-902C)
Above 15°C (60°F) SAE 50 (TB 03-901 C) SAE 40 or SAE 50 (TB 03-902B)
From - 1°C (30°F) to 32°C (90°F) SAE 40 (TB 03-901 B) SAE 40
　
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