Table of Contents
Advertisement
Adjustment
In the event that 120°C is reached in a typical climb to 2000' or 600m, it is probable that the jacket is
covering too much of the radiator for the prevailing conditions.
adjust/remove as necessary. To adjust from 100% to 50% coverage, simply pull the bottom of the cover up
to the top.
The following are typical coverage settings in normal usage:
AMBIENT TEMPERATURE
Up to 23°C
24-32°C
33°C+
Inspection
Check the security of the installation of the jacket as part of your daily inspection, and carefully inspect the
jacket for wear or damage every 50 hours.
4.17 TRIM SYSTEM
Electric trimmer
The wing is provided with fixed reflex lines and a small bracket on the wing keel. An electric winch with limit
switches and position sensor is mounted at the bottom of the pylon. The winch is operated by a spring-return
switch on the throttle box and the trim position is displayed by LED bar graph on the instrument panel. The
winch pulls on a bungee inside the pylon fairing which pulls a cord connected via a pulley to the wing keel
bracket. This system provides finger-tip control, with lighter pitch and roll forces at low speeds than the reflex
trimmer. Aerodynamic efficiency is also better at slow speeds.
Normal operation
The basic operation of the trimmer is to set the desired attitude and adjust the power setting so that the
aircraft is in a steady state, and then adjust the trimmer till the bar force disappears. It is not good practice to
fight the trimmer by pulling the bar in whilst selecting slow trim.
The trimmer takes approximately 18 seconds to run through the whole range. In the cruise, there may be a
delay of a few seconds when selecting nose-up trim as the trimmer takes up the slack.
Note that the takeoff trim placard is set at approximately 65mph, to avoid too much pitch-up on the initial
climb. For landing approach, trim at 55 mph solo, 60mph dual.
Abnormal operation
The trim motor only runs when the pilot holds the trim switch, it will stop as soon as it is released. It can also
be stopped by pulling out the 5A circuit breaker or by turning off the main master switch.
The trim motor 5Amp circuit breaker should not trip under any normal operating condition. It may trip if the
pilot pulls the bar all the way back whilst selecting full nose up trim; this practice is not recommended as it
puts unnecessary load on the system. In this case it is permissible to reset the C.B. after 2 minutes. The
C.B. will also trip if the trim motor should run past the normal limit microswitch and the motor is not stopped
by the pilot, in which case the bungee will eventually be stopped at the top of the engine mount frame and
the trim speed will be very slow, 40-45mph.
With correct inspection and maintenance, trim cord or bungee failure is unlikely. If it happens the aircraft will
go to full fast trim, 75-82 mph. In the case of main electrical system failure, the trim will stay where it is. In
any case, fly the aircraft at the normal approach and landing speeds, accepting the out-of-trim force.
•
The aircraft should be left with the trimmer slack (fast) to prolong the life of the system.
With correct maintenance, failure is unlikely. However It is advisable to practice landing at both extremes
•
of trim occasionally.
Quik & Quik GT450 Maintenance Manual
th
29
March 2007
Issue 1
RADIATOR COVERAGE
100%
50%
No coverage - remove jacket
NOTE
WARNING
!
Never take off with a faulty trim system. Always
check trim operation and flight controls before
takeoff.
Make a precautionary landing and
Page 34 of 54
Advertisement
Table of Contents
