Yak 18T Flight Operations Manual
Page 20 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.
45. To drain and INSPECT the fuel contents, move underneath the fuselage to
identify the fuel drain cap (only 1 fuel drain on a Yak 18T). This is located
aft of the cowling, just in front of the split flap
46. Carefully UNSCREW the locking screws and allow the fuel cap to open on its
hinge. Note, use the right tool and avoid using excessive force when
opening the cap as this will decrease the life of the screw heads
47. Use a reasonably large clear container (unlike the usual test-tube like
drainers). HOLD the container beneath the drain and PUSH the release
valve to allow the fuel contents to fill the container
48. CHECK that the fuel is free from mechanical admixtures, sediments, water,
ice crystals and is of the correct colour (i.e. blue). It is quite normal to drain
200ml-300ml of fuel
49. If unsatisfied with the fuel contents, RE-DRAIN and RE-CHECK. If you are
in doubt, err on the side of caution and seek additional advice – do not rely
on hope. We all know that the carburettor can become blocked and hence
stop the engine at a critical time
50. REPLACE the fuel cap and as before, carefully lock the securing screws in
place without using excessive force
Visual Fuel Inspection
51. With a full tank reading, the fuel level in the tanks must be BELOW the
edges of the tank fillers by at least 3cm. The total capacity of the fuel tanks
is 193litres (more for those 18T’s with extended wing or wing-tip tanks)
52. REMOVE the fuel cap and fuel lock on the port wing (similar to when
checking the oil)
53. REMOVE the inner fuel filter and then use a fuel dip-yoke (if available,
visually if not) to MEASURE the contents of the tank. Note: with extended
wing tanks, it is not possible to gain an accurate measure of the tank
contents by visual inspection due to the wing dihedral
54. REPLACE the fuel filter and lock and ensure it is correctly positioned and
SECURE (similar to oil) even if you are awaiting additional fuel
55. REPLACE the fuel cap and lock the screws in the correct position
Performing the Walk Around
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