Yak 18T Flight Operations Manual
Page 19 of 82
Disclaimer: This manual is to be used as a reference only, it is based on translated Yak 18T Flight Operations
Manuals and has not been approved by the Yakovlev Design Bureau or any other authority.
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4.3. Performing the Inspection
4.3.1. Pre-flight Checks
Checking the Fuel and Oil
38. The amount and grade of the available fuel and oil must be CHECKED and
REPLENISHED if necessary. The pilot-in-command must be sure that the
fuel deposit is discharged and is free of mechanical additives and water and
in wintertime ice crystals
Checking the Oil
39. The oil contents are checked by the means of a dip-yoke attached to the oil
cap on top of the cowling. First CHECK the oil by climbing on the starboard
wing, edging forward avoiding the oil cooler until you can comfortably
remove the oil filler cap without losing your footing. If you are quite a heavy
individual or are uncomfortable with this approach, find some step-ladders
and climb from either side of the cowling – it’s safer this way
40. REMOVE the cap, undo, remove and check the dip-yoke and ENSURE that
the oil contents are in the range of 12-14 litres for ordinary flight (>8litres for
aerobatic flight). The standard oil level reading is 18 litres. The total oil tank
volume is 30litres
41. ADD the correct grade of oil as required by using a funnel being careful not
to spill the oil during the process
42. Once satisfied with the oil contents, ensure that you REPLACE the dip-yoke
and cap correctly and SECURELY. CHECK that the dip-yoke cap is held
tight under the edges of the oil filler tab and then tighten
43. When refitting the oil cap on top of the cowling, ENSURE that the cap is
placed correctly and that the screw ‘clicks’ into place to fasten the cap
correctly
44. NOTE the quantity of oil and the amount added in the engine log book
Checking the Fuel Deposit
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