Northern Airborne Technology NPX138 - Manual (Page 27)

NPX138 Installation Approval Test Procedure
Rev. 1.10 Apr 19, 2004 Page 2 of 7
E NG-FORM: 634-0100.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
4. Results
If the installed system passes all of the applicable EMI tests, then no further action is
required. If interference is observed, then the interference must be assessed against
the appropriate standards of airworthiness for the system in question. For example: it is
permissible for a VFR certified GPS to lose navigation capability while the NPX138 is
transmitting, providing that it recovers properly and promptly, but it is not permissible for
an IFR Approach certified GPS to be affected in the same way. A complete discussion
of all the standards of airworthiness to be applied in assessing EMI effects is beyond
the scope of this document.
5. Procedure
A. Operate the NPX138 transmitter on the following frequencies for at least 20 seconds.
Observe the GPS for any degradation in satellite status, or availability, or flags.
FREQUENCIES GPS #1 GPS #2
NPX138 PASS FAIL PASS FAIL
143.2187 MHz
143.2200 MHz
153.4500 MHz
157.5400 MHz
157.5437 MHz
NOTES: