AEM MTP136D-000GN Mission Transceiver Panel Mount Owner’s Manual

AEM MTP136D-000GN Mission Transceiver Panel Mount

Product Information

Specifications

• Part Number: MTP136D-000GN
• Description: Mission Transceiver Panel Mount
• Revision: 1.00

Product Usage Instructions

Installation Approval Test Procedure
Purpose: The purpose of the test procedure is to identify any interference the MTP136D-000GN transceiver may cause with existing aircraft systems.

Methodology:

1. Perform a general function test of the MTP136D and identify the antenna VSWR.
2. Monitor the GPS for degradation in satellite status, availability, or flags.
3. Monitor the VHF communication for any noise, audio signals or anomalies.
4. Monitor the VOR/ILS navigation systems for any irregular movement of needles or flags.
5. Monitor the Glide Slope system for any interference.
6. Monitor the Autopilot or Stability Augmentation System for any anomalies.
7. List and record any anomalies noted during transmission of electric instruments like power plant or fuel.

Results: If the system passes all tests, no further action is required. If a test fails, an assessment regarding airworthiness must be made.

Functional Test

Initial Installation Functional Test:
Install and function test the MTP136D transceiver before operations. Perform a forward/reverse power test using an in-line wattmeter to check the antenna VSWR.

GPS Functional Test: GPS interference sources are usually harmonically related frequencies associated with the transceiver’s operation band. Monitor frequencies within GPS C/A Narrow Correlator band for interference.

FAQ

• Q: What should I do if a test fails during the Installation Approval Test Procedure?
  A: If a test fails, an assessment must be made regarding the airworthiness of the failed system.

COVER SHEET FOR DOCUMENTATION ONLY.
DO NOT PRINT THIS PAGE.

Revisions

Purpose
The purpose of this test procedure is to identify any interference the MTP136D-000GN transceiver may cause with existing aircraft systems.

Methodology

Test Setup
Many of the post installation Electromagnetic Interference (EMI) tests can be completed on the ground. Where applicable (required) or easier, flight testing can be utilized. Aircraft that are approved for Instrument Flight Rules (IFR) operations shall undergo mandatory inflight testing for interference between the MTP136D transceiver and the approach aids.

During testing it is recommended to:

1. Set the MTP136D in the High transmit power mode for all tests listed in this document. (This step is required).
2. Set the GPS receiver to navigate (NAV Mode) using at least the minimum number of complimenting satellites to achieve accurate navigation.
3. Set the VHF transceivers to the indicated frequencies in this document with the squelch opened.
4. Set the VOR/ILS/GS receivers to the indicated frequencies in this document and selected for viewing.
5. Set the VOR/ILS ramp test set to the frequencies indicated in this document and adjust the output until the flags are out of view.
6. Monitor the transponder and encoder with ramp test equipment.
7. Set the ADF to a navigation station within proximity.

Test Methodology

1. Perform a general function test of the MTP136D and identify the antenna VSWR.
2. Monitor the GPS for degradation in satellite status, availability, or flags.
3. Monitor the VHF communication for any noise, audio signals or anomalies.
4. Monitor the VOR/ILS navigation systems for any irregular movement of needles or flags.
5. Monitor the Glide Slope system for any interference.
6. Monitor the Autopilot or Stability Augmentation System while at safe altitude and during a coupled ILS approach for any anomalies.
7. Using the provided chart list the electric instruments such as the power plant or fuel and record any anomalies noted during transmission.

Results
If the installed system passes all EMI tests, then no further action is required. If a test failed, then an assessment must be made regarding the airworthiness of the failed system.

Example: GPS Systems
VFR certified GPS systems are allowed to lose navigation capabilities while the MTP136D is actively transmitting given that the GPS quickly and fully recovers all functionality when transmission is ended. Anomalies such as this are not acceptable for IFR approach certified GPS systems. Full analysis of airworthiness in respect to EMI is left to the reader.

Functional Test

Initial Installation Functional Test
The MTP136D transceiver should be installed and function tested before beginning operations. It is also recommended to perform a forward/reverse power test using an in-line wattmeter to check the antenna Voltage Standing Wave Ratio (VSWR). No more than 10% of power should be reflected.

GPS Functional Test
GPS interference sources are usually the set of harmonically related frequencies associated with installed transceivers frequency band of operation. Specifically, those frequencies that fall within the GPS C/A Narrow Correlator band (1571.42 -1570.42 MHz). Typically, the set of GPS interference sources are the relevant harmonics integer frequencies (10th and 11th ) associated with the following VHF marine bands, 157.142-157.942 MHz and 142.856-143.584 MHz respectively.
Determine from the MTP136D Transceiver’s operational channel range the harmonically relevant frequencies that fall within the GPS band. Select a set of these frequencies. Any one of the many possible sets will suffice. Record these values in the spaces provided in the following chart. Transmit using the MTP136D on the frequencies listed in the table below for a minimum of 20 seconds. During this time observe the GPS for any degradation in satellite status, availability, or flags.

Notes:
VHF Communications Functional Test
Identify if the operational range of the MTP136D overlaps with any of the image frequencies of the VHF communications. If any overlap exists, select a set of image frequencies (IF) that will place MTP136D as close to the image frequencies as possible. It is recommended to only use one of the possible frequency sets. Record the image frequencies in the table listed below. Transmit using the MTP136D on all frequencies listed in the table for a minimum of 20 seconds. During transmission listen for any noise, audio signals or anomalies on the VHF communications.

Example: Bendix/King KY 196A:
The KY 196A has the first IF frequency at 11.4 MHz. Since the Local Oscillator (L.O.) is above the received frequency (high side injection) the IF is 22.8 MHz above the selected frequency. Set the KY 196A to 120.000 MHz and the MTP136D to 142.8000 MHz.

Notes:
VOR/ILS Navigation Systems Functional Test
Identify if the operational range of the MTP136D overlaps with any of the image frequencies of the VOR/ILS navigation systems. If any overlap exists, select two sets of image frequencies (IF) that will place MTP136D as close to the IF as possible. Ensure that one frequency set lies within the localizer frequency range and the other lies within the VOR frequency range. Record the image frequencies in the table listed below. Transmit using the MTP136D on the frequencies listed in the table below for a minimum of 20 seconds. During this time listen for any noise, audio signals or anomalies on the receiver audio and observe the navigation display for any movement by the flags or needles.

Notes:
Glide Slope Functional Test
Note: To avoid interference generated by nearby structures and aircraft it is recommended to perform the following tests outside and as far away from all structures and aircraft as is practical.
Utilize a portable glide slope generator to provide sufficient signal strength to clearly activate the indicator needle and hide all flags. Increase the signal strength from the portable glide slope generator by 3 dB. Transmit using the MTP136D on all frequencies listed in the table below for a minimum of 20 seconds. During transmission observe the navigation display for any movement by the flags or needles. Record the results below.

Notes:
If the ground test failed and interference exists, flight testing must be conducted. Utilize the tables below and determine the glide slope frequency which is based on the localizer frequency of the Instrument Landing System (ILS) that will be used. Set the MTP136D to half of the identified glide slope frequency.
Fly the aircraft such that the localizer and glide slope intercept at 26 NM from the runway. The interception point is marked when both needles from the localizer and glide slope are centred. Transmit on the MTP136D for 10 seconds and observe the navigation display for any movement by the flags or needles. This test must be repeated every 2 NM until the flags and needles are no longer affected. If no deflections or flags are noted within 18 NM of the runway, then a pass shall be recorded. If the test is failed, the MTP136D must be placarded with “Do not transmit while on ILS approach”.

Notes:

Autopilot or Stability Augmentation System Functional Test

Identify frequencies that are at the top, middle, and bottom of the MTP136D frequency range and use them throughout Section 4.6.

• Top of frequency range:
• Middle of frequency range:
• Bottom of frequency range:

Activate the autopilot or stability augmentation system at a safe altitude and transmit using the MTP136D on the top, middle and bottom frequencies identified above for a minimum of 20 seconds. Monitor the autopilot or stability augmentation system for any anomalies and record all observations below.

Notes:
Transmit using the MTP136D for a minimum of 20 seconds while performing a coupled ILS approach to the aircraft’s certified limits. Monitor the autopilot for any anomalies and record all observations below. Repeat this test for different systems such as GPS, FMS, ILS#2.

Notes:

Electrical Instruments and Anomalies

List the power plant, fuel and other electric instruments in the chart provided and note any anomalies that occur operating the MTP136D. Assess the results.

End of Installation Approval Test Procedure
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