User Manual

TRIM:COM – (Flight Modes)
The TRIM:COM parameter can be toggled back and forth between COM and FM by pressing the
rotary selector when COM or FM is highlighted. If left in the COM mode, the digital trims for
elevator, ailerons, and rudder are Common or shared by the 3 Flight Modes. If FM is selected
the XP9303 keeps track of the digital trims independently for each Flight Mode which means the
pilot can re-trim the aircraft using the digital trims for each Flight Mode. This is a very useful
feature if switching between Flight Modes causes the aircraft's trim to change, such as when
flaps are deployed by one of the Flight Modes causing a slight roll. In this case the pilot can
simply use the aileron digital trim to trim the ailerons, eliminating the roll tendency when that
Flight Mode is selected. Selecting other Flight Modes brings in a corresponding set of trims
ensuring the aircraft stays in trim as the pilot changes between the 3 Flight Modes during flight.
ENT
LIST
CLR
[Devic.SEL]
Function
Name
FLIGHT MODE
FLAP SW
Remainder of display
omitted for clarity
Dual Rate Switch. Can be
SW which uses the 3 n
2-position D/R switches
can be FM which uses th
3-position Flight Mode
switch to switch all channels
at same time
ormal
or
e
TRIM: COM
D/R: FM
FLAP Switch selected as the
Flight Mode switch
Trim Mode. Can be COM where Flight
Modes share same trim settings or can be
FM where each Flight Mode has its own trims
and aircraft is trimmed for each Flight Mode.
If Flight Modes are only going to be used to switch between 3 sets of Dual Rates/Exponential
settings then leave the TRIM parameter set to COM. If other functions are to be controlled
by Flight Modes which may have a tendency to cause the aircraft trim to change, then select
FM for the TRIM parameter. The example shows COM selected meaning that one set of
trims will be shared by the 3 Flight Modes. The setting can be changed at any time by
returning to this display.
NOTE: When trims are set to FM, be especially careful during the first flight of an aircraft to
remember that the aircraft will need to be trimmed using the digital trims for Aileron,
Elevator and Rudder for each Flight Mode selected during flight. If the aircraft is badly out-
of-trim, it will probably be badly out-of-trim for each Flight Mode selected during flight. If
the out-of-trim condition is very severe, it might be wise to land after trimming the first
Flight Mode and then note the trim settings. Switch to the other 2 flight modes and match
the trims to these settings before flying again.
JR XP9303 Detailed Function Descriptions 26