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corrosion. All joints in the
combustion section must be
examined for cracks, buckling and
overheating, including welds. Check
magnetic plug in freewheel assembly
for particles (not 206L). Check
exhaust ducts for FOD damage and
fluid in bottom. Inspect ignition and
electrical harnesses. Operate throttle,
check stops. Check chip detectors.
Close cover.
Open the cover over the engine oil
tank filler cap. Remove the cap and
check dipstick for correct oil level.
Replenish as necessary. Replace cap,
close and secure the cover.
On the Bell 206L, ensure the oil
cooler blower is free from
instructions.
Examine the tail cone to fuselage
attachment for movement by
looking through the fuselage
immediately behind the attachment
and ensuring that there is an even
distribution of spacing throughout.
The panel (with all the bolts in) is a
structural panel, and the machine
should not be moved if it is off.
Examine the complete length of the
tail rotor drive cover for security and
signs of damage. The fasteners
should all be in the same direction at
45° to the vertical/horizontal, except
the last, which should be vertical, but
this is more of a function of whether
they were put on that way in the first
place. A better move is to tap each
fastener to see if it is loose. Examine
the complete length of the tail cone
assembly for signs of rippling and
riveting for security.
Examine starboard stabiliser and
green navigation light. Grasp and
move up and down listening for
cracking. Check twisting of retaining
bolt. On the Bell 206L, ensure free
movement of the elevator assembly.
Examine the vertical stabiliser, tail
skid and anti-collision beacon for
security and signs of damage.
Examine rear navigation light. Look
through the hole on top of the tail
skid attachment point for evidence
of heavy landing.
Examine the tail rotor gearbox and
ensure that the oil level is correct
and that chip detector is in (the sight
gauge is the circular thingy in the top
left of the picture below. The
perspex panel is notoriously difficult
to see through).
Examine the tail rotor hub assembly
and test the flapping movement for
free operation. Inspect the flapping
bumper. Ensure that the pitch
change spherical bearings are oil and
moisture free. Move the blades to
full pitch and check that the pitch
change rods do not touch the hub (if
The Bell 206 153
they do, the wrong one has been
fitted).
Inspect tip blocks of tail rotor blades
and riveting for security and
corrosion. Look along rotors for
straightness. Grasp the spindle and
check for free play.
Examine remainder of port tail
boom assembly as for starboard side.
Open engine oil tank drain access
flap and check tail rotor drive shaft
bearings. Check for security of tank,
draintap and for leaks. Do not
remove items from oil cooler
blower, as this is a high speed item
and may be imbalanced as a result.
Check red button on oil filter:
If it is out, push it in, carry out an
engine run and look again. If it is still
out, refer to engineer. Close flap.
Open the baggage compartment and
inspect for cleanliness, signs of
damage and loose articles. Check
float nitrogen level, if fitted.
Check the port engine compartment
as for the starboard side, but also
check the tail rotor drive shaft for
freedom to float. In addition, inspect
the input drive shaft for signs of loss
of grease and general cleanliness of
the compartment. There is a
miniscule hole at the bottom of one
of the pipes – ensure it is clear.
Close the hatch.
Open the port hatch of the main
gearbox compartment and examine
gearbox mountings. Close the hatch.
Climb on top of the fuselage and
complete the inspection of the main
rotors, rotor head and main mast
together with the pitch change rods.
Inspect main rotor pitch links and
pitch horn trunnion bearings for
damage, security, corrosion, cracks
and wear. Make sure the nuts and
bolts are in the correct way, so that
air pressure holds them in, should
the retaining nut come off.
Move the main mast to test for
deterioration of the gearbox isolation
mount, lateral movement being
acceptable, but none fore and aft.
Inspect main rotor hub and stops for
evidence of mast contact.
Inspect upper and lower blade
surfaces for security and damage,
154 The Helicopter Pilot’s Handbook
　
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