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B KLN 94
Rev. 4, Jan/2003 10599I04.CDL Page 2-75
If the interference is from the radiating VHF COMM, an optional notch filter (i.e. the KA 198 P/N
071-01565-0000 or TED Mfg 4-70-54) will need to be installed. The recommended location for
the inline filter should be as close to the VHF RT as practical.
NOTE
The conditions and tests performed on this article are minimum performance
standards. It is the responsibility of those desiring to install this article either
on or within a specific type or class of aircraft to determine that the aircraft
installation conditions are within these performance standards. The article
may be installed only if further evaluation by the applicant documents an
acceptable installation and is approved by the Administrator.
2.The other possibility is re-radiation from an ELT. The radiated RF from the VHF COMM can
excite the output tank circuit of the ELT and cause it to oscillate and radiate RF strong enough to
interfere with the GPS. If disconnecting the ELT antenna eliminates the GPS interference, the
manufacturer of the ELT should be contacted for a recommended solution.
G.Select the AUX 14 page and verify that the first line of that page on the unit display screen
reads as follows:
SW REVISION 0X0X
(where 0X0X is the last four digits of the KLN 94 Application Software 206- number)
An entry must be made in the aircraft log book upon installation of the KLN 94, indicating the
applicable software revision level. The recommended log book wording is as follows:
KLN 94 Application Software is at SW REVISION 0X0X on DD MMM YYYY.
(where 0X0X represents the last four digits of the KLN 94 Application Software 206- number
and DD MMM YYY represents the Day, Month and Year of the installation)
2.4.4 INTEGRATED INSTALLATION CHECK OUT
The following paragraphs define checkout procedures for all possible Input/Output signals that
can be connected to the KLN94. It should be clearly determined which of the signals are
intended to be used in any given installation and then only the paragraphs pertaining to those
signals should be performed.
2.4.4.1 All Installations
Perform all steps defined in Paragraph 2.4.3 and leave the system energized with a valid GPS
signal being received.
2.4.4.2 CDI/HSI Interface
Cycle the power on the KLN94, which will cause the self-test page to be displayed. Verify that the
CDI needle, after it has settled, is indicating half scale right deflection.