TB 1-4920-443-35
AEDATS II T55-GA-714A FADEC ALIGNMENT WORKSHEET
e.
Collective Pitch
(1) Refer to Honeywell Technical Manual, Pub No SE-876-01-1060, Section 3-2.1
(2) Remove the FADEC Control Chassis, (LTCT28915-03), from the test cell console without removing
any of the cables, and remove the top cover. Start Fadec diagnostic software (laptop)
(a) Connect a DVM, set to AC volts, to the FADEC Control Chassis' TB2-1 (+) and TB2-2 (-)
Measure and record the voltage excitation (Ex) supplied by the DECU in Table 3-7.
(b) Connect a DVM, set to AC volts, to the FADEC Control Chassis' TB2-3 (+) and TB2-4(-) Turn the
collective pitch dial located on the front panel of the FADEC Control Chassis until a reading of
6.95% of Ex is attained. Record the dial position in Table 3-6 as this value represents 0.0%
Collective Pitch.
(c) Turn the collective pitch dial until a reading of 58.16% of Ex is attained. Record dial position in
Table 3-7 as this value represents 73.75% Collective Pitch.
(d) Turn the collective pitch dial until a reading of 67.03% of Ex is attained. Record the dial positions
in Table 3-7 as these value represent 85.0% Collective Pitch.
NOTE
Do not turn dial below or above dial points.
Ex = _________
Dial Indication
Collective Pitch
TB 2-3(+)
%
TB 2-4(-)
0.00
6.95% Ex
____________
____________
73.75
58.16% Ex
____________
____________
85.00
67.03% Ex
____________
____________
f.
N2 SET
(1) Refer to Honeywell Technical Manual, Pub No SE-876-01-1060, Section 3-2.2
(a) Connect cable (PN LTCT31480-02) to a laptop computer or other test cell PC.
(b) Start the FADEC diagnostic software (PN LTCT29332-02) and display the gauge N2 Set and
Collective pitch.
NOTE
The zero and span potentiometers are located on the printed circuit board, which is
mounted in a vertical position and secured to the front panel. These potentiometers are
positioned on the top of the board.
(c) Rotate the N2 Set dial fully CCW. Adjust the zero potentiometer (R10) for an indication of 97%
on the N2 Set gauge.
(d) Rotate the N2 Set dial fully CW. Adjust the Span potentiometer (R11) for an indication of 103%
on the N2 Set gauge.
(e) Repeat steps D and E until no further adjustments are required.
g. N2 Calibration Speed
(1) Connect Precision Signal Source (2700 Box) to J18 pins u & v (LTCT28917-03)
AEDATS 2
Analog Gauge
Digital Gage
Calculating Counter
(NPT)
+/- 0.2 %
(00355)
704 Hz (25%)
____________
____________
____________
____________
1408 Hz (50%)
____________
____________
____________
____________
2112 Hz (75%)
____________
____________
____________
____________
2816 Hz (100%)
____________
____________
____________
____________
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