Systems Guide

Aerosoft
Twin Otter E
XTENDED
Systems
Vol
2
2-1-12
19 November 2013
handle will illuminate. A test switch is installed to test the system. When the fire handles are pulled an
extinguishing agent is released. The engine can no longer be used in flight after this.
EXTERNAL LIGHTS
The external lights consist of position lights, landing lights and anti-collision lights.
POSITION LIGHTS
The position (or navigation lights) are red and green on the wingtips and white in the tail. They are controlled
with the POSN light switch.
ANTI-COLLISION LIGHTS
Two white strobes on each wingtip and a red rotating beacon on the vertical stabilizer are controlled by the
ANTI COLL light switch.
ANTI-ICING / DE-ICING
Being designed to be operated in harsh conditions the Twin Otter has adequate anti-icing and de-icing
equipment.
Icing is known to exist between ÷10 - +2°C whenever there are some kind of moisture present, thus if it rains
(super cooled droplets) or if visibility drops below a certain point (low visibility is most often caused by moist
air.
ICING EFFECT SIMULATED
While structural icing does exist in FSX, the impact of icing only occurs under very rare circumstances. In the
Twin Otter Extended we have made an enhanced icing script that makes structural ice build-up much more
likely. Icing can occur at temperatures between -10° and +2° when there is enough moisture in the air. Low
visibility conditions in the dangerous temperature zone is a good indication of possible icing.
• Structural icing where ice starts to build up on fuselage and wings, which adds both weight and drag
to the point where the aircraft no longer can sustain flight and can be removed by turning on the de-
icing boots.
• Window icing occurs when moisture freezes on the window screen. Turn on window heat to prevent
the icing.
• Engine inlet ice build, which might trigger ice ingestion to the engines causing flameout and can be
prevented by turning on inlet heaters and extending the inertial separators.
• Pitot probe icing where the probe gets blocked by ice. Turn on pitot heat to prevent the icing.
• Propeller icing where ice builds up on the propeller blades, which lowers propeller performance and
might add imbalance and thus vibrations. Turn on prop de-ice to prevent the icing.
TRIM
Like most aircraft the Twin Otter has 3 axis trim controls. These are electrical and operated by controls
mounted on the seats of both pilots. Use your mouse wheel to change the settings. When you keep your
mouse pointer on the control a tool help will pop us showing the exact setting.
WING FLAP SYSTEM
The hydraulically operated wing flaps consist of inboard and outboard fore flaps and an inboard trailing flap on
each wing. There are indications on both the flap levers and on the windshield centre post. Note that the flaps