Northern Airborne Technology NTX - Manual (Page 44)

NTX066 Installation Approval Test Procedure
Page 2 of 5 Aug 10, 2005 Rev. 1.00
ENG-FORM: 634-0100.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
not have adverse effects on these systems. After checking for gross effects at a
safe altitude, fly an approach with each of the different navigation systems
coupled to the autopilot (ILS, GPS etc.) and look for any anomalies.
4. Results
If the installed system passes all of the applicable EMI tests, no further action is
required. If interference is observed, 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 NTX066 is transmitting, providing that it recovers properly and promptly.
It is not permissible for an IFR Approach certified GPS to be affected in the same
way. A complete disclosure of all the standards of airworthiness to be applied in
assessing EMI effects is beyond the scope of this document.
5. Procedures
5.1
Operate the NTX066 transmitter on the frequencies listed in Table 1 for at least
20 seconds. Observe the GPS for any degradation in satellite status, or
availability, or flags.
Frequencies GPS #1 GPS #2
NTX066 Pass Fail Pass Fail
68.200 MHz
68.495 MHz
75.020 MHz
81.840 MHz
87.520 MHz
87.525 MHz
Table 1
NOTES:
5.2
If the image frequency for the VHF Comm falls within the range of the NTX066
unit, select a set of frequencies that will cause the NTX066 to be set as close as
possible to the image frequency. Any one of many possible sets can be used.
Record these values in Table 2. Modulate the NTX066 transmitter on the
frequencies listed in Table 1 for at least 20 seconds. Listen for any noise or
detected audio signals on the VHF comm.