Embraer EMB145, Operation Manual

Page: 2016 / 2662

AIRPLANE
OPERATIONS
MANUAL
FLIGHT CONTROLS
REVISION 38
2-13-10
Page
17
Code
01
AOM
-145/
111
4
EICAS INDICATION
1 - PITCH TRIM indication
A green pointer moving on a white vertical scale represents the
amount of pitch compensation.
Trim position is indicated digitally in a white box.
The letters UP or DN are presented above the box to indicate
that the airplane is trimmed up or down.
Scale ranges from 4° nose down (bottom of scale) to 10° nose
up (top of scale). Every thick mark on the scale represents
3.5° of pitch.
A green band is provided on the analog scale from 4° to 8° nose
up to indicate the allowable takeoff position range for the
horizontal stabilizer.
NOTE : Due to the system’s resolution, it’s possible to have the digits,
box and pointer turning amber, in spite of the fact that the pitch
trim indication is displayed at 4º or 8º. The trim setting color
displayed on the EICAS depends on the horizontal stabilizer
surface position. For the unit 8 displayed on the EICAS the
surface position can be between 7.7
q
and 8.7
q
going upward
and between 8.3 q and 7.3 q going downward. The color change
would occur when the surface position is 8.1
q
. For this reason,
when setting pitch trim to 8, first select 7. Then, increase
slowly and stop trimming immediately when the value 8 is
displayed. For the unit 4 displayed on the EICAS, the surface
position can be between 3.7
q
and 4.7
q
going upward and
between 4.3
q
and 3.3
q
going downward. The color change
would occur when the surface position is 3.9
q
. For this reason,
when setting pitch trim to 4, first select 5. Then, decrease
slowly and stop trimming immediately when the value 4 is
displayed. This procedure prevents to set the trim at the top or
bottom of the green band in order to avoid the possibility of
encountering takeoff config warnings.
In the event of a pitch trim miscomparison, the pointer, digital
value, and the direction indication are removed from display.
If the pitch trim is out of the green band and the airplane is on
the ground, the pointer and digital indications will turn amber.