Habitually these values do not need adjustment and the recommended values are useful to most of the
engines, but with the purpose of being able to use the FADEC with any type of turbine and pump
combination they are included in the menu of adjustment of the user.
Acceleration
The FADEC calculates the speed of acceleration depending of the exhaust temperature and rpm of this
parameter (Up Delay), and therefore, it is possible to modify the global time of acceleration modifying
this value. With values of 15 an acceleration of 3s is obtained from 7N to 75 N , lowering to 2s of 17N
to 75N. This times are temperature dependents and is assumed a EGT of 550ºC of the engine and
800ºC programmed maximum. If the engine is running hotter or the programmed max. temperature is
lower, the time will be longer. Increasing the value of this parameter the time of acceleration is longer
and diminishing it, lower. A too long time does not have any repercussion for the engine, but the aircraft
is much more difficult to fly. A too short time implies that the FADEC tries to accelerate the engine
fastest than it can. Because the FADEC controls the exhaust temperature, there is no trouble for the
engine, but when having the thermocouple a thermal inertia, it can be a momentary overheat that
causes that the acceleration is not continuous when being reached the maximum temperature at some
moment. Therefore it is necessary that the thermocouple has the minimum mass to have a very low
thermal inertia. Also it is necessary to install the thermocouple in the hottest part of the engine to be
able to detect the overheats early.
The tuning is made by fast accelerating the engine from idle to maximum power and regulating this
value until the motor accelerates fast and continuously.
Deceleration
For the calculation of the speed of deceleration the FADEC such considers parameters that in the
acceleration, unless the fixed value is this other parameter. In principle there is no mechanical limitation
or of temperature referring to the speed of slope, but it has been found that some engines tend to
flame-out when the fuel flow is reduced suddenly. The habitual value is 20, but the user can increase
this parameter to extend the time in case that the engine is extinguished. The test is made in sense in
opposition to the previous one, with the engine in full power lower the stick suddenly to idle. The motor
must decelerate quickly without extinguishing itself.
Stability
Once the engine has reached approximately the power corresponding to the value of the throttle setting,
the FADEC adjusts the fuel flow with the purpose of match the exact value of thrust. The speed what
the FADEC make this adjustment can be programmed with this parameter. The habitual values vary
between 10 and 20, depending on the time of programmed acceleration / deceleration, the temperature
and the inertia of the whole system including pump, engine, tubes, etc. If a too low time is programmed,
the engine will not become stabilized and will be raising and lowering to the power when correcting the
FADEC more quickly than the response time of the turbine.
6. Limited Warranty
The FADEC main unit and HDT is warranted to be free from defects in materials and workmanship for
a period of one (1) year from the date of original purchase. This warranty is nontransferable. If your unit
requires warranty service during this period, we will replace or repair it at our option. Shipping cost to
us is your responsibility. This limited warranty only covers FADEC main unit and HDT This limited
warranty does not cover the problems that result from: External causes such as accident, abuse,
misuse, polarity reversal, short-circuit ,crash damage, servicing not authorized by us, usage that is not
in accordance with product instructions and failure to follow the product instructions.
