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       #1  

    AD 2021-23-12 - Radio Altimeter Flight Restriction / 5G Wireless (all Embraer Models)

    This AD requires an update to the AFM by Embraer by January 4, 2022 adding Radio Altimeter Flight Restrictions to the Limitations Section.

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    2021-23-12.pdf
    Jim Grace - T82 - Phenom 100EV
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    #2  
    Thanks Jim. Ironically I think very few (if any) Phenom can do SA CAT I, CAT II, CAT II or RNP (AR), so the AD limitations don't really apply?
    KPIE - Phenom 300 N329MC ATP: EMB-550/EMB-505/EMB-500 & EA500
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       #3  
    Ahh yea, that is a very good point!
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    #4  
    While not technically applicable, since our jet is on a 135 cert we still had to post it to meet their maintenance program standards. Still doesn't make sense to me.
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    #5  
    Embraer just released Flight Operations Letter FOL PHE505-001/22: 5G C-BAND POTENTIAL INTERFERENCE ON RADAR ALTIMETERS

    Summary

    The Phenom 300 airplanes are optionally equipped with Honeywell Radar Altimeter model KRA-405B, which may be affected by 5G C-Band interference below 500 ft AGL.

    The interference of the 5G C-Band signal may cause the Radar Altimeter to:
    – present erroneous indication,
    – indicate “no computed data” (like an altitude above 2500 ft AGL, where there should be no radar altitude indication on the PFDs), or
    – declare a failure condition (RALT FAIL message displayed on the EICAS).

    The systems and functions affected by erroneous Radar Altimeter indication are:
    – Traffic Alert and Collision Avoidance System
    – TCAS II (OPTIONAL)
    – Terrain Awareness and Warning System
    – TAWS-A (OPTIONAL)
    – Reactive Windshear (OPTIONAL)
    – Predictive Windshear (OPTIONAL)
    – Landing Gear Aural Warning
    – Runway Overrun Awareness and Alerting System (ROAAS) (OPTIONAL)

    All operators are encouraged to report events of anomalous radar altimeter behavior to Embraer without delay. Reports of consistent anomalous radar altimeter behavior in approximately the same location could be an indication of potential interference.
    KPIE - Phenom 300 N329MC ATP: EMB-550/EMB-505/EMB-500 & EA500
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    #6  
    I was told that to comply with this AD you simply need to add the paperwork to your AFM. Does that sound correct? I have not looked deeply through it.
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    #7  
    That is correct. Specifically see section g and it states adding a copy of the AD to the AFM demonstrates compliance. Add an entry to CAMP or whatever program you use and it’s all done.
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    #8  
    Is there any evidence that 5G interferes with ANY avionics? The technology has been around for sufficient time in a number of countries and should be very easy to test. The FAA had people turning off phones and PEDs for decades before finally agreeing it makes no difference. This site provides some answers from those promoting the 5G.
    https://www.5gandaviation.com/?gclid...BoCSToQAvD_BwE
    ...and this is the best I could find from the FAA
    https://www.faa.gov/newsroom/faa-statements-5g
    and
    https://www.faa.gov/5g
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    #9  
    Aaron, I’ve witnessed cell phone interference. Flying a LNAV/VNAV approach with a G1000 and my copilot (the owner) had left his cell phone on. When it began receiving signals (probably also transmitting/receiving mail and messages), his CDI/GS (PFD2) became quite erratic and unusable for the remainder of the approach.
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    #10  
    Quote Originally Posted by (Username Protected) View Post
    That is correct. Specifically see section g and it states adding a copy of the AD to the AFM demonstrates compliance. Add an entry to CAMP or whatever program you use and it’s all done.
    I recently switched my subscription to all but the QRH in electronic format only. Therefore do I need to remove my paper AFM from the cockpit to be compliant? I don’t think I’ve ever looked at it in flight so it’s not necessary other than it has the original W&B in it. Do I remove those and leave the W&B in the a/c or can that be electronic copy only as well?

    Thanks,

    Ron
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    #11  

    5g Radar Alt interference

    I am seeing a lot of unusual readings now on the P300 Radar Alt setting. Will jump around between 150 and 950 feet taxiing on the ramps at KCLM in particular, but also observed at KCOE.

    Thanks
    Travis
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    #12  
    Thanks Travis --- I can't emphasize too much, make sure those get reported, both to ATC as well as to Embraer.
    Perhaps most importantly, the FAA at this address:

    https://www.faa.gov/air_traffic/nas/RADALT_reports/

    My airline had an Airbus significantly impacted in Denver yesterday. (Remember, RADALT ties in to many systems, such as EGPWS. Embraer provides a list in FOL 505-001/22.

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