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BENDIX/KING KLN 90B
Page 2-66 10521I05.TDC Rev 5, April/2003
The second part of this procedure deals with an installation in which some or all of the electrical
signal I/O have been utilized. This second section is divided in such a way that each input or output
signal is treated separately, and hence only those subsections that apply to a given installation will
be conducted.
It is assumed that the operator’s manual for the various units connected to the KLN 90B (as well
as the manual for the KLN 90B itself), are available or that the installer is familiar with operating
the units.
2.4.3 INSTALLATION CHECK OUT
Before inserting the unit into the mounting rack, verify that at the rear connector of the mounting
rack, aircraft power is present on Pin 40, and that there is a ground on Pin 27. In installations using
28 V lighting, lighting bus voltage should be present between Pins 28 (Hi) and 32 (Lo). In Installa-
tions using 5 V or 14 V lighting, lighting bus voltage should be present between Pins 29 (Hi) and
28/32 (Lo), that is both Pins 28 and 32 must be low. Verify that there are no voltages or grounds
present on any other pins.
A. Verify that the blower is operating properly.
B. Making sure that the power On/Off switch, located on the front panel of the KLN 90B, is in
the "out" position (power off), plug the unit into the mounting rack and verify that the panel
lighting works properly.
C. Energize the unit by pushing in the power control switch.
D. Manipulate the controls as necessary to display Nav 2 Page on the right half of the screen
and Set 1 Page on the left half of the screen.
On the Set 1 Page, enter the present position for the installation location accurate to within
60 nautical miles.
Display the Set 2 Page. Verify that the date and time are correct to within 10 minutes and
update if necessary. If the date is off by a large amount and the date cannot be set back to
the correct year, make the receiver blind to the satellites by disconnecting the coax, setting
the date while on the bench with no antenna, covering the antenna with aluminum foil or pull
the aircraft in where the satellites are not available, such as in the hanger.
E. At this point the aircraft will have to be moved to a location known to have reasonable GPS
signal coverage. This implies an outside location away from tall structures that could mask
low elevation satellites.
F. Display the Status 1 Page. The State shown on the page should change to Acquire (ACQ)
and after a period of not more than 5 minutes, (typically two minutes depending on the sat-
ellite coverage), the unit should display Latitude and Longitude values on the Nav 2 Page
that are correct for the installation location. If the State shown is Search the Sky (STS), the
unit will take up to 15 minutes to calculate a position.
G. Display the Status 1 Page and verify that no asterisks appear next to any satellite with an
elevation greater than 25°. Select 121.15 MHz on COMM 1. Transmit on COMM 1 for a pe-
riod of 20 seconds and verify that no asterisks appear on the Status 1 Page for satellites
with an elevation of greater than 25°. Repeat for the following frequencies 121.175, 121.20,
131.250, 131.275 and 131.30 MHz. Repeat the above procedure for all VHF COMM’s on
board the aircraft.
If any of the above tests do not pass (any asterisks appear on satellites with greater than
25° during the above tests), it will be necessary to identify the source of the interference.
There are two common sources of interference: