Monitoring of NAVAIDS

[Mattio]

When a NAVAID is said to be monitored, does it mean that it is monitored by a self-monitoring system or by a person or does it refer only to being monitored by a person?

 

[MikeD]

Refers to the link between the Navaid itself and the whichever facility is charged with monitoring the signal integrity of said Navaid. If that link is down, the Navaid is NOTAMd as unmonitored.

 

[Mattio]

Ok, thanks.

It was this section from the IPH that threw me off:

MONITORING OF NAVIGATION FACILITIES​

VOR, VORTAC, and instrument landing system (ILS)
facilities, as well as most nondirectional radio beacons
(NDBs) and marker beacons installed by the
FAA, are provided with an internal monitoring feature.
Internal monitoring is provided at the facility
through the use of equipment that causes a facility
shutdown if performance deteriorates below established
tolerances. A remote status indicator also may
be provided through the use of a signal-sampling
receiver, microwave link, or telephone circuit. Older
FAA NDBs and some non-Federal NDBs do not have
the internal feature and monitoring is accomplished
by manually checking the operation at least once each
hour. FAA facilities such as automated flight service
stations (AFSSs) and ARTCCs/sectors are usually the
control point for NAVAID facility status. Pilots can
query the appropriate FAA facility if they have questions
in flight regarding NAVAID status, in addition to
checking notices to airmen (NOTAMs) prior to flight,
since NAVAIDs and associated monitoring equipment​

are continuously changing.

It appeared that some were considered monitored but not monitored by an actual person when I read it.