TB 1-9150-200-24
TURBINE ENGINE OIL CHANGES.
a. Oil change intervals for turbine engines will vary from model to model depending on the operating oil tem-
perature resulting from speciic airframe installations and engine conigurations. MIL-PRF-23699 should provide a
much greater oil life than MIL-PRFL-7808. Operating experience will be used as a guide in determining if oil changes
are necessary between overhauls. In the interim the recommendations of the applicable service instruction manual
should be followed.
b. When changing from MIL-PRF-7808 oil to MIL-PRF-23699 oil, the following procedure should be used if
speciic instructions are not provided in the applicable aircraft maintenance manual:
(1) Drain the MIL-PRF-7808 oil from the component oil system.
(2) Inspect, clean, and reinstall all component oil ilters and strainers.
(3) Fill component oil system with MIL-PRF-23699 oil, and operate aircraft for a period of 30 minutes to one
hour.
(4) Shutdown aircraft.
(5) Inspect, clean, and reinstall all component oil ilters and strainers. If oil ilter(s) was heavily contaminated,
comply with (6) through (10) below. If oil ilter was not heavily contaminated, comply with (8) through (10) below.
(6) Drain all MIL-PRF-23699 oil from component oil system and dispose of oil.
(7) Fill component oil system with new MIL-PRF-23699 oil and release aircraft for service use.
(8) After 5 hours of aircraft operation, inspect and clean all component oil ilters and strainers.
(9) After 15 hours aircraft operation since oil change, inspect, clean, and reinstall all component oil ilters
and strainers.
(10) Revert to normal ilter and strainer inspection interval.
c.
When changing from MIL-PRF-23699 oil to MIL-PRF-7808 oil, the following procedure should be used:
(1) Drain the MIL-PRF-23699 oil from the component oil system.
(2) Inspect, clean, and reinstall all component oil ilters or strainers.
(3) Fill component oil system with MIL-PRF-7808 oil, and release aircraft for service use.
Synthetic oils, such as MIL-PRF-23699 and MIL-PRF-7808, may soften paint or stain clothing upon
contact. If synthetic oil is spilled on painted surfaces, those surfaces should be cleaned Immediately.
Skin should be thoroughly washed after contact and saturated clothing should be removed immedi-
ately. Prolonged skin contact with synthetic oils may cause a skin rash. Areas where synthetic oils
are used should have adequate ventilation to keep mist and fumes to a minimum. Synthetic oils are
highly toxic and should not be ingested.
