Handling, Servicing & Maint.
Pilot's Flight Manual
7-6 Reissued: 16 Jan 2019
4. Re in stall drain plug in en gine sump and at tach safety wire.
Ta ble 7-2. Rec om mended En gine Oil Grades
Sin gle Mul ti ple Av er age Am bi ent
Vis cos ity Vis cos ity Air Tem per a ture
— 15W50 or 20W50 All Tem per a tures
60 — Above 80°F
50 — Above 60°F
40 — 30° to 90°F
30 20W40 0° to 70°F
20 20W30 Be low 10°F
7-5. BAT TERY SER VIC ING
The bat tery stores elec tri cal en ergy pro duced by the he li cop ter al ter -
na tor and sup plies cur rent to the elec tri cal sys tem on de mand. The
he li cop ter uses a 24-volt bat tery lo cated on the right-hand for ward
side of the cen ter-sec tion frame.
Over filling and over charg ing the bat tery are two com mon causes of
elec tro lyte spill age dur ing he li cop ter flight. To pre clude cor ro sion
of the struc ture due to bat tery acid spill age or spew ing, per form
these few sim ple ser vic ing pre cau tions:
1. Main tain the proper elec tro lyte level in the bat tery; do not over -
fill.
2. Main tain the proper charg ing rate (volt age) of the he li cop ter
elec tri cal sys tem.
3. Vi sually in spect bat tery for cracks, spilled elec tro lyte, cor ro -
sion, and se cu rity of mount ing.
4. Vi sually in spect ad ja cent struc ture for ev i dence of cor ro sion and
spilled elec tro lyte.
5. Re move spilled elec tro lyte from bat tery and ad ja cent com po -
nents.
6. To check or ser vice bat tery cells:
a. Un screw filler caps at top of bat tery.
SCHWEIZER
Model 269C-1 Helicopter
CSP book 2..indd 144 8/4/19 12:54 PM
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