When is testing of an analog 121.5/243 MHz ELT authorized and for how long?

6-2-4. Emergency Locator Transmitter (ELT)
a. General.
1. ELTs are required for most General Aviation airplanes.
REFERENCE-
14 CFR SECTION 91.207.
2. ELTs of various types were developed as a means of locating downed aircraft. These electronic, battery
operated transmitters operate on one of three frequencies. These operating frequencies are 121.5 MHz, 243.0
MHz, and the newer 406 MHz. ELTs operating on 121.5 MHz and 243.0 MHz are analog devices. The newer
406 MHz ELT is a digital transmitter that can be encoded with the owner's contact information or aircraft data.
The latest 406 MHz ELT models can also be encoded with the aircraft's position data which can help SAR forces
locate the aircraft much more quickly after a crash. The 406 MHz ELTs also transmits a stronger signal when
activated than the older 121.5 MHz ELTs.
(a) The Federal Communications Commission (FCC) requires 406 MHz ELTs be registered with the
National Oceanic and Atmospheric Administration (NOAA) as outlined in the ELTs documentation. The FAA's
406 MHz ELT Technical Standard Order (TSO) TSO-C126 also requires that each 406 MHz ELT be registered
with NOAA. The reason is NOAA maintains the owner registration database for U.S. registered 406 MHz
alerting devices, which includes ELTs. NOAA also operates the United States' portion of the Cospas-Sarsat
satellite distress alerting system designed to detect activated 406 MHz ELTs and other distress alerting devices.
(b) As of 2009, the Cospas-Sarsat system terminated monitoring and reception of the 121.5 MHz and
243.0 MHz frequencies. What this means for pilots is that those aircraft with only 121.5 MHz or 243.0 MHz
ELTs onboard will have to depend upon either a nearby air traffic control facility receiving the alert signal or an
overflying aircraft monitoring 121.5 MHz or 243.0 MHz detecting the alert and advising ATC.
(c) In the event that a properly registered 406 MHz ELT activates, the Cospas-Sarsat satellite system can
decode the owner's information and provide that data to the appropriate search and rescue (SAR) center. In the
United States, NOAA provides the alert data to the appropriate U.S. Air Force Rescue Coordination Center
(RCC) or U.S. Coast Guard Rescue Coordination Center. That RCC can then telephone or contact the owner to
verify the status of the aircraft. If the aircraft is safely secured in a hangar, a costly ground or airborne search is
avoided. In the case of an inadvertent 406 MHz ELT activation, the owner can deactivate the 406 MHz ELT. If
the 406 MHz ELT equipped aircraft is being flown, the RCC can quickly activate a search. 406 MHz ELTs permit
the Cospas-Sarsat satellite system to narrow the search area to a more confined area compared to that of a 121.5
MHz or 243.0 MHz ELT. 406 MHz ELTs also include a low -power 121.5 MHz homing transmitter to aid
searchers in finding the aircraft in the terminal search phase.
(d) Each analog ELT emits a distinctive downward swept audio tone on 121.5 MHz and 243.0 MHz.
(e) If "armed" and when subject to crash-generated forces, ELTs are designed to automatically activate
and continuously emit their respective signals, analog or digital. The transmitters will operate continuously for
at least 48 hours over a wide temperature range. A properly installed, maintained, and functioning ELT can
expedite search and rescue operations and save lives if it survives the crash and is activated.
(f) Pilots and their passengers should know how to activate the aircraft's ELT if manual activation is
required. They should also be able to verify the aircraft's ELT is functioning and transmitting an alert after a crash
or manual activation.
(g) Because of the large number of 121.5 MHz ELT false alerts and the lack of a quick means of verifying
the actual status of an activated 121.5 MHz or 243.0 MHz analog ELT through an owner registration database,
U.S.SAR forces do not respond as quickly to initial 121.5/243.0 MHz ELT alerts as the SAR forces do to 406
6-2-2 Emergency Services Available to Pilots

2/20/25 AIM
MHz ELT alerts. Compared to the almost instantaneous detection of a 406 MHz ELT, SAR forces' normal
practice is to wait for confirmation of an overdue aircraft or similar notification. In some cases, this confirmation
process can take hours. SAR forces can initiate a response to 406 MHz alerts in minutes compared to the potential
delay of hours for a 121.5/243.0 MHz ELT. Therefore, due to the obvious advantages of 406 MHz beacons and
the significant disadvantages to the older 121.5/243.0 MHz beacons, and considering that the International
Cospas-Sarsat Program stopped the monitoring of 121.5/243.0 MHz by satellites on February 1, 2009, all aircraft
owners/operators are highly encouraged by both NOAA and the FAA to consider making the switch to a digital
406 MHz ELT beacon.  Further, for non-aircraft owner pilots, check the ELT installed in the aircraft you are
flying, and as appropriate, obtain a personal locator beacon transmitting on 406 MHz.
b. Testing.
1. ELTs should be tested in accordance with the manufacturer's instructions, preferably in a shielded or
screened room or specially designed test container to prevent the broadcast of signals which could trigger a false
alert.
2. When this cannot be done, aircraft operational testing is authorized as follows:
(a) Analog 121.5/243 MHz ELTs should only be tested during the first 5 minutes after any hour. If
operational tests must be made outside of this period, they should be coordinated with the nearest FAA Control
Tower. Tests should be no longer than three audible sweeps. If the antenna is removable, a dummy load should
be substituted during test procedures.
(b) Digital 406 MHz ELTs should only be tested in accordance with the unit's manufacturer's
instructions.
(c) Airborne tests are not authorized.
c. False Alarms.
1. Caution should be exercised to prevent the inadvertent activation of ELTs in the air or while they are being
handled on the ground. Accidental or unauthorized activation will generate an emergency signal that cannot be
distinguished from the real thing, leading to expensive and frustrating searches. A false ELT signal could also
interfere with genuine emergency transmissions and hinder or prevent the timely location of crash sites. Frequent
false alarms could also result in complacency and decrease the vigorous reaction that must be attached to all ELT
signals.
2. Numerous cases of inadvertent activation have occurred as a result of aerobatics, hard landings,
movement by ground crews and aircraft maintenance. These false alarms can be minimized by monitoring 121.5
MHz and/or 243.0 MHz as follows:
(a) In flight when a receiver is available.
(b) Before engine shut down at the end of each flight.
(c) When the ELT is handled during installation or maintenance.
(d) When maintenance is being performed near the ELT.
(e) When a ground crew moves the aircraft.
(f) If an ELT signal is heard, turn off the aircraft's ELT to determine if it is transmitting. If it has been
activated, maintenance might be required before the unit is returned to the "ARMED" position. You should
contact the nearest Air Traffic facility and notify it of the inadvertent activation.
d. Inflight Monitoring and Reporting.
1. Pilots are encouraged to monitor 121.5 MHz and/or 243.0 MHz while inflight to assist in identifying
possible emergency ELT transmissions. On receiving a signal, report the following information to the nearest
air traffic facility:
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AIM 2/20/25
(a) Your position at the time the signal was first heard.
(b) Your position at the time the signal was last heard.
(c) Your position at maximum signal strength.
(d) Y
our flight altitudes and frequency on which the emergency signal was heard: 121.5 MHz or 243.0
MHz. If possible, positions should be given relative to a navigation aid. If the aircraft has homing equipment,
provide the bearing to the emergency signal with each reported position.