曝光台 注意防骗
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with button on collective.
Make flat approach and
land, slight forward speed.
MGB.P Main gearbox
oil at min
pressure
Reduce power, land ASAP
MGB.T Main gearbox
oil max
temperature
Test caution panel to
check light. If it does not
come on, treat as oil
pressure is zero. if it does,
land and check oil level.
You can fly to the nearest
base if the level is normal.
BAT T Battery is at
maximum
temperature
Isolate the battery
(pushbutton off) and land
ASAP
ENG P Engine oil
pressure
Reduce power and check
indicator. If pressure is low
or 0, check torquemeter –
shut down the engine if it
Light Problem Action
is very low, and land
immediately if it is normal.
If pressure and
torquemeter are normal,
land ASAP.
GEN Either a DC
supply failure
or an
overvoltage
has been
detected.
Test the DC voltage.
Check the position of the
pushbutton, then attempt
to reset. If unsuccessful,
loadshed and continue,
ensuring you get at least
22 volts, and bearing in
mind altitude limits when
fuel booster pumps are
off. Expect about 50
minutes from the battery
by day, and 20 by night.
BAT Batt isolated
from DC– not
charging.
Check the pushbutton (on)
and keep an eye on the
voltage.
HORN Horn not set Actuate pushbutton on
control pedestal panel.
DOORS One or both
bge doors
unlocked.
Reduce airspeed to below
138 mph. Land carefully.
ENG
CHIP
Metal in
engine oil.
Land ASAP.
Engine Relighting
The normal ceiling is 13000 feet, but
you can try above this.
No Item Action
1 Booster
Pumps
On
2 Generator On
3 Engine NG below 30% to avoid
jerks on
resynchronisation
Fuel Flow Rate Drop
Symptoms are as for engine failure,
with the exception that NG stabilises
at a low rate (less than 70%) after a
few seconds. When this happens,
establish autorotation and advance
the fuel flow control into the
emergency sector. You should get a
rise in NG and T4. Keep the engine
speed at 70% and increase collective
if necessary to bring the rotor speed
to 350 RPM. Then increase the fuel
flow till the rotors are running at 380
AS 350 167
RPM – trim collective and fuel flow
for level flight at this speed.
Excessive Fuel Flow
Symptoms are increasing NG, T4
and Torque. First of all, do not
reduce collective. Next, reduce fuel
flow until rotor speed corresponds
to a position of the indicator pointer
in the centre of the green area.
Continue flight with the governor
out of action. If you reduce the
collective, you will have to make a
corresponding adjustment in the fuel
flow as the RPM will increase. Make
a low approach at 65 kts, holding the
rotor at the upper limit of the green
area (394 RPM) with the fuel flow
control (you can leave it alone during
finals, as the rotor speed will drop
when you increase collective). After
touchdown, reduce the fuel flow
before decreasing collective.
Surging
Symptoms are oscillations of RPM,
Torque and T4, and jerks in the yaw
axis. The initial reaction should be to
change the collective setting. If
surging carries on while fuel and
engine oil pressures are correct,
reduce fuel flow slightly to take it
out of the governed range. If you
still get it, land as soon as possible
and shut down.
Engine Fire
During Start
· Close the fuel shutoff cock and
apply rotor brake
· Switch off the booster pumps
· Crank engine for 10 seconds,
then switch off battery
· Fight the fire with extinguishers
or whatever
In Flight
· Enter autorotation
· Shut down the engine by closing
the fuel shutoff cock
· Switch off the booster pumps,
generator and alternator
· If a smell of burning, switch off
the electrical master
Smoke in the cabin
If you can identify where the smoke
is coming from, shut down the
offending system and use the fire
extinguisher if necessary (it could be
hydraulic fluid being pulled through
the engine). Ventilate the cabin.
If you don't know where the smoke
is coming from, turn off the heater.
If that doesn't work, switch off the
electrical master, then all systems,
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本文链接地址：
The Helicopter Pilot’s Handbook(109)
