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trailing edges for delamination and
trim tabs and trailing edge weights
for security and damage. Inspect
blade root end doublers for
delamination, using "coin tapping"
method in suspect areas. Inspect
leading edges for erosion, damage
and blade tape condition.
Inspect hydraulic lines and actuators
for leaks. On the Bell 206L, inspect
hydraulic system filter bypass
indicator button for bypass
condition and reservoir for level.
Inspect swashplate assembly and
boot for damage. Inspect pitch
change horn for evidence of wear.
Check security of gearbox filler cap.
Check cowling fasteners and intake.
Check remainder of port side as for
starboard side.
Preflight
This is equivalent to the external walk-round in the Flight Manual. Of course, in
most companies, the pilot also does the daily check, so a lot of things here are
checked twice, but are done again if you take a machine over from someone else.
The items here have been expanded to allow for comments and operating tips.
Many people preflight the machine, and leave the blades tied down because they
are not taking off for some time. Don't let it happen to you! Not only do you need
to release the blades, but the process of untying them and walking them round
(backwards) to the lateral position also ensures that the rotor disk will be in a wide
enough space for you to start. The reason you go backwards is to listen for and
squeaks and squeals coming from the labyrinth seal in the turbine.
Prestart
This check tries to follow a logical order of going round the cockpit, starting with
the collective, along and up the instrument panel to the overhead console. Many
other people do it the other way round. Naturally, some switches and instruments
will be in vastly different places in some machines, so adapt them to your own.
No Item Action
1 Hatches/
Harnesses
Secure. Your passengers should already have been briefed, and the DI done with
the blades undone.
2 Frictions,
Throttle
Take off the frictions, and cycle the controls through their complete ranges of
movement. Don’t be gentle with this – I once had a cyclic stick snap off at the root
during this check – if it’s going to break, now is when you want it to happen. This
check includes the throttle – ensure it is fully closed, or you will get a really hot
start, especially if duals are fitted, as it is possible to fit the collective so the throttle
opens but does not close.
3 Landing lights The switch is on the collective, at the left hand side of the box on the end. It should
be off.
4 Engine anti-ice Usually underneath the end of the collective on the horizontal extension of the
instrument panel, in a little grey panel. It should be off for starting.
5 Hydraulic switch Next to the anti-ice switch. Switch it on
6 Electrics/Radios Off. These may be controlled by a Master Avionics switch in the roof console.
7 Fuel Valve Usually at the bottom right of the instrument panel. It should be on, with the guard
closed to keep it that way.
The Bell 206 155
No Item Action
closed to keep it that way.
8 Instruments Check condition, that is, no smashed glass, stuck needles, etc. If the machine has
been used before, note the residual readings. Check the altimeter by twisting the
setting knob and ensuring that the needle moves in the correct sense. Set as
required.
9 Floats Could be anywhere. Off.
10 Rotor Brake On the overhead console. Off.
11 Wander light Between front seats, about halfway down. Turn Off.
12 Battery On, but keep off if using external power. Having said that, there’s no problem with
keeping the switch on with an external battery fitted, which can be used as a
booster if the ship’s battery is weak. Having started, you can recharge both
batteries at once.
13 Auto Relight Check – set off
14 Fuel pumps On singly, check fuel pressures each time, then leave both On
15 Caution Cb In, check:
Low rotor RPM Lts/sound
Engine out Lts/sound
Txmission Press Low
Engine Out
Fuel pump fail
Generator Fail
Check all lights
Off
16 Ignition Cb In
17 Beeper Fully down – check you can hear it motoring.
Start
If you ever have to start without an N1 gauge (we had one that stuck in really cold
weather), 15% is about the point at which the blades start turning just on airflow
through the engine. 58% is about 25% rotor RPM.
External Start Battery Start
25 Secs On 40 Secs On
30 Secs Off 60 Secs Off
25 Secs On 40 Secs On
30 Secs Off 60 Secs Off
25 Secs On 40 Secs On
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本文链接地址：
The Helicopter Pilot’s Handbook(102)
