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Figure 13-5. By interpreting the position lights on other aircraft, you can determine whether the aircraft is flying away from you
or is on a collision course. If you see a red position light to the right of a green light, such as shown by aircraft number 1, it is
flying toward you. You should watch this aircraft closely and be ready to change course. Aircraft number 2, on the other hand,
is flying away from you, as indicated by the white position light.
Apparent Horizon
Actual Horizon
Apparent Horizon
Actual Horizon
Figure 13-6. You can place your helicopter in an extremely
dangerous flight attitude if you align the helicopter with the
wrong lights. Here, the helicopter is aligned with a road and
not the horizon.
Figure 13-7. In this illusion, the shoreline is mistaken for the
horizon. In an attempt to correct for the apparent nose-high
attitude, a pilot may lower the collective and attempt to fly
“beneath the shore.”
13-4
LANDING ILLUSIONS
Landing illusions occur in many forms. Above featureless
terrain at night, there is a natural tendency to fly a
lower-than-normal approach. Elements that cause any
type of visual obscuration, such as rain, haze, or a dark
runway environment also can cause low approaches.
Bright lights, steep surrounding terrain, and a wide runway
can produce the illusion of being too low, with a
tendency to fly a higher-than-normal approach.
NIGHT FLIGHT
The night flying environment and the techniques you use
when flying at night, depend on outside conditions.
Flying on a bright, clear, moonlit evening when the visibility
is good and the wind is calm, is not much different
from flying during the day. However, if you are flying
on an overcast night over a sparsely populated area,
with little or no outside lights from the ground, the situation
is quite different. Visibility is restricted so you
have to be more alert in steering clear of obstructions
and low clouds. Your options are also limited in the
event of an emergency, as it is more difficult to find
a place to land and determine wind direction and
speed. At night, you have to rely more heavily on the
aircraft systems, such as lights, flight instruments, and
navigation equipment. As a precaution, if the visibility
is limited or outside references are inadequate, you
should strongly consider delaying the flight until conditions
improve, unless you have received training in
instrument flight and your helicopter has the appropriate
instrumentation and equipment.
PREFLIGHT
The preflight inspection is performed in the usual manner,
except it should be done in a well lit area or with a
flashlight. Careful attention must be paid to the aircraft
electrical system. In helicopters equipped with fuses, a
spare set is required by regulation, and common sense,
so make sure they are onboard. If the helicopter is
equipped with circuit breakers, check to see that they
are not tripped. A tripped circuit breaker may be an
indication of an equipment malfunction. Reset it and
check the associated equipment for proper operation.
Check all the interior lights, especially the instrument
and panel lights. The panel lighting can usually be controlled
with a rheostat or dimmer switch, allowing you
to adjust the intensity. If the lights are too bright, a glare
may reflect off the windshield creating a distraction.
Always carry a flashlight with fresh batteries to provide
an alternate source of light if the interior lights
malfunction.
All aircraft operating between sunset and sunrise are
required to have operable navigation lights. Turn
these lights on during the preflight to inspect them
visually for proper operation. Between sunset and
sunrise, theses lights must be on any time the engine
is running.
All recently manufactured aircraft certified for night
flight, must have an anticollision light that makes the
aircraft more visible to other pilots. This light is either
a red or white flashing light and may be in the form of
a rotating beacon or a strobe. While anticollision lights
are required for night VFR flights, they may be turned
off any time they create a distraction for the pilot.
One of the first steps in preparation for night flight is
becoming thoroughly familiar with the helicopter’s
cockpit, instrumentation and control layout. It is recommended
that you practice locating each instrument,
control, and switch, both with and without cabin lights.
Since the markings on some switches and circuit
breaker panels may be hard to read at night, you should
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