A diamond da-40-180 pilot reported that while flying whenever they transmitted on frequency 133.600 ...

Attributes
ACN	1352215
Time
Date	201605
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Make Model Name	DA40 Diamond Star
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	ELB / ELT
Person 1
Function	Instructor Pilot Not Flying
Qualification	Flight Crew Multiengine Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Commercial
Experience	Flight Crew Last 90 Days 30 Flight Crew Total 250 Flight Crew Type 160
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural FAR

Narrative:

On an IFR flight; whenever we transmitted on 133.600 mghz; our ELT would start going off. Even though the ELT transmits on 121.500; the signal was so strong it could be heard on all frequencies on both of our aircraft radios and a handheld radio that I had. Before we realized the ELT was blocking all our radios; we squawked 7600 because we could no longer hear ATC. Once we realized the ELT was causing the problem; I reset it and re-established contact with ATC. Every time we had to transmit; the ELT would sound off again; forcing me to reset it over and over. Finally when we got transferred to a different approach; the ELT stopped causing problems.I called our maintenance and they said that once in a blue moon; transmitting on certain frequencies causes the ELT to trigger. On our return flight we once again had to talk to center on 133.600 but the ELT did not sound off this time.

Original NASA ASRS Text

Title: A Diamond DA-40-180 pilot reported that while flying whenever they transmitted on frequency 133.600 MGhz (Atlanta Center) the Emergency Locator Transmitter would start going off blocking all frequencies.

Narrative: On an IFR flight; whenever we transmitted on 133.600 MGhz; our ELT would start going off. Even though the ELT transmits on 121.500; the signal was so strong it could be heard on all frequencies on both of our aircraft radios and a handheld radio that I had. Before we realized the ELT was blocking all our radios; we squawked 7600 because we could no longer hear ATC. Once we realized the ELT was causing the problem; I reset it and re-established contact with ATC. Every time we had to transmit; the ELT would sound off again; forcing me to reset it over and over. Finally when we got transferred to a different approach; the ELT stopped causing problems.I called our maintenance and they said that once in a blue moon; transmitting on certain frequencies causes the ELT to trigger. On our return flight we once again had to talk to center on 133.600 but the ELT did not sound off this time.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

A diamond da-40-180 pilot reported that while flying whenever they transmitted on frequency 133.600 mghz (atlanta center) the emergency locator transmitter would start going off blocking all frequencies.