AlliedSignal KAP 140 Manual de instalación descargar pdf (Pagina 27)

BENDIX/KING

KAP 140

Page 2--7

Revision 6, Oct 2002

CS:00991I06.IDU

In a two--axis installation, create a valid Glideslope signal and null the deviation display. Now

select the GS Deviation and press “ENTER”. This will compensate for any offsets in the

glideslope tracking.

This completes the installation offset adjustments. Now return to the top--level menu by pressing

“ENTER” twice, to prevent accidental changes in the offset parameters.

2.3.3.2.1 Display Brightness adjustments

The display uses a photocell to automatically adjust the brightness under a wide range of

ambient conditions. The unit contains a default brightness curve to track ambient changes. If

necessary, the brightness curve of the display can be adjusted. The display brightness

adjustment is accomplished by engaging the autopilot and keeping the AP button pressed.

While holding the AP button, adjust the pot to obtain the desired display brightness. NOTE: This

adjustment controls two independent settings ---- at moderate to bright ambient conditions, it

controls the slope of the brightness vs. ambient curve. In darker ambient conditions, it controls

the minimum display brightness. Therefore, for optimum alignment, first adjust the display in a

dark ambient to achieve the desired brightness under these conditions. Then adjust it again,

as required, under moderate--to--full brightness ambient conditions.

2.3.3.2.2 Switch Backlighting adjustments.

The switch backlighting brightness is controlled by the dim bus input to the flight computer.

However, the minimum backlighting level can be adjusted, if desired. This adjustment is made

by disengaging the autopilot with the AP switch while continuing to hold the switch. The

adjustment is also made with the front panel pot.

2.3.3.3 Ground Checkout Procedure

If the system has been successfully adjusted as described above, the following ground

checkout should be performed.

Engage the autopilot in the HDG mode and move the heading bug left and right of the lubber

line. The control wheel should follow the heading bug direction and should stop moving when

the bug is under the lubber line.

Engage APR mode with an ILS signal and watch for proper response to deviations in LOC (and

GS in a two--axis system). If a GPS is installed, select this sensor and use NAV mode to check

autopilot response to the GPS deviation.

A fly right deviation should cause the control wheel to turn to the right, while a fly left deviation

should cause the control wheel to turn left. For the GS, a fly up deviation should cause a

rearward control motion; a fly down deviation should cause the control to move forward. It is

not necessary to stop or center the control wheel with the deviations, since the offset adjustment

procedure has already been performed.

In a two--axis system, engage VS (default) mode and check for rearward control wheel

movement after pressing the UP button twice (to change the VS reference) Check for nose

down control by pressing the DN button three times (to establish a nose down VS reference).

The control wheel should now move forward. Press CWS on the control wheel and check that

the control wheel stops moving. Release CWS and the control wheel should still not move in

the pitch axis. If trim is installed, check autotrim operation by slowly pushing the control wheel

forward. After a few seconds, the trim should run in the UP direction. Now, slowly pull back on

the wheel and check for trim in the DN direction after a few seconds.

If trim is installed, check Manual Electric Trim by pressing the switches in the UP direction (with

ARM). The trim should run in the UP direction. Check again with the DN switch (and ARM). Now

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AlliedSignal KAP 140 Manual de instalación Pagina 27

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