BENDIX/KING
KAP 140
Page 2--6
Revision 6, Oct 2002
CS:00991I06.IDU
NOTE
For the roll and pitch axis null adjustments, adjust the pot until 0
+
.020 volts DC is measured across the servo drive pins D and L of the
roll servo and the pitch servo harness connectors. This is
accomplished as follows: First, allow the FCC to pass pre--flight test;
then unplug the servo connector from the aircraft harness. Next
apply an aircraft ground to pin K of the harness connector. Now
connect the digital multimeter across the harness connector pins D
and L to monitor the servo drive voltage.
1. Engage the autopilot by pressing the “AP” button on the FCC. The default ROL mode
must be selected, i.e. the HDG, NAV, or APR modes are not engaged. Using a DMM,
measure the DC voltage across pins D and L of the roll servo harness connector.
Adjust the pot until a value of 0 +
.020 volts is measured. If you reach the end of the
pot travel before nulling the servo drive, disengage the autopilot, turn the pot fully to
the opposite stop, and re--engage the autopilot. The roll null adjustment emulates a
four--turn pot by allowing this method of “resetting” the pot adjustment range. This
adjustment compensates for offsets in the roll axes, including the turn indicator.
Continue turning the pot to null the voltage.
2. In a two axis system, the pitch axis must also be adjusted. This is accomplished by
pressing the “ALT” button (engaging the altitude hold mode). Now, press and hold the
“ALT” button (engaging the vertical speed mode VS) and then press and hold the
“DN” button while still pressing and holding the “ALT” button. In this state, the pot
should be used to adjust the pitch servo drive to a null. Using a DMM, measure the
DC voltage across pins D and L of the pitch servo harness connector. Adjust the pot
until a value of 0 +
.020 volts is measured.
3. Reconnect the servo harness connectors(s) to the servo(s) before proceeding any
further.
The rest of the sensor offsets are compensated by a different method, using the remote terminal
interface. From the top--level menu on the terminal, enter the installation menu by pressing “N”.
Now press “2” and “ENTER” to enter the Installation Offset page. From this page, the remaining
offsets can be compensated. For each parameter listed, after entering the associated number,
zero the input to the flight computer and press “ENTER”. This can be done without engaging
the autopilot. The null values will be stored in the configuration module and used to compensate
the input value when the autopilot is engaged. The following paragraphs detail this procedure.
Turn the heading bug (and course pointer, if HSI installation) to the lubber line. For a KI 525A,
alignment should be done with the aircraft or compass card pointing north(Slew Compass).
Select Heading Datum on the installation offset page and press “ENTER”. Do the same for
Course Datum. This compensates for offsets in the DG/HSI.
Using a test generator, create a valid VOR signal and adjust until the deviation displayed on the
CDI or HSI is centered. Select VOR Deviation on the installation offset page and press
“ENTER”. This compensates for offsets in the VOR deviation signal. If a GPS is installed, select
GPS and perform the same procedure for GPS deviation. Select an ILS frequency and perform
the same procedure for the Localizer deviation.
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Kommentare zu diesen Handbüchern