Pilot's Guide to Avionics 2017-2018 - 45

controllers and nearby aircraft.
The FAA has seen an increasing number of

may see a second aircraft displayed very close to
your own position, prompting you to try to avoid an

reports about ADS-B and transponder ground tests

aircraft that isn't there. Mistakenly thinking you need

resulting in test signals being sent into surrounding

to act fast to avoid a collision with an aircraft that

airspace. This could prompt controllers to rapidly

doesn't exist can cause a safety hazard.

direct traffic around false targets or require pilots

The FAA ADS-B Focus Team's highest

to react to resolution advisories issued by TCAS

communications priority is to quickly contact any

equipment or to ADS-B In traffic alerts.

aircraft operator with incorrect ICAO codes (either

The recent increase in improper ground tests has

a single erroneous code or two codes that don't

prompted the FAA's ADS-B Focus Team to publish

match) or the wrong flight identification number. The

a Safety Alert for Operators to emphasize the

agency handles about 200 of these high-priority

importance of following applicable transponder and

cases a month.

ADS-B testing procedures. For more on this, visit

Because ADS-B performance problems can

www.faa.gov/other_visit/aviation_industry/airline_

emerge after initial installation, it is a good idea for

operators/airline_safety/safo/.

aircraft owners to check performance with PAPR

Aside from antenna-shielding issues, the FAA
says other high-priority ADS-B installation issues

periodically, especially after maintenance or a
software update to an ADS-B system component.

relate to improperly entered codes, including:
*

An aircraft's FAA-assigned ICAO 24-bit
code is wrong. Some ADS-B units are

requesting and receiving PAPR reports based

changed to the assigned aircraft code at

on feedback from aircraft owners, pilots and

installation or is entered incorrectly, the

manufacturers.
An earlier process let users request ADS-B

FAA's ADS-B ground system. If an aircraft's

avionics performance by email, but responses could

N number can't be connected to a particular

take up to a day. Now a user can visit the FAA's

flight, a PAPR request cannot be processed.

portal an hour after a flight, enter data in a few

Two different ICAO codes might be loaded

fields and submit a request in a matter of minutes. A

in error into the Mode S transponder and the

six-page report comes back in about 30 minutes.

UAT on the same aircraft.
*

The FAA continues to improve the process for

manufactured with a default code. If it isn't

aircraft will not be properly recognized by the

*

Improving PAPR as ADS-B equipage rises

A PAPR provides an overall assessment of avionics

The flight identification number should match

performance and sufficient detail to determine if your

the aircraft call sign used in air traffic control

equipment complies with ADS-B regulations. It also

communications and the aircraft call sign

flags any issues about the integrity and accuracy of

filed on your flight plan.

your aircraft position reports.

If the transmitted ICAO code doesn't correlate

The FAA estimates that 100,000 to 160,000

to your aircraft's assigned N number, your ADS-B

general aviation aircraft may need to be ADS-B Out

installation is not compliant with the FAA rule.

equipped by the 2020 deadline. About 1,300 new

Ground test equipment will only verify that an ICAO

ADS-B installations occur each month.

code is loaded, not that it is valid for your airframe.
Having different codes in your Mode S
transponder and your UAT will appear on a

Equipping early and validating that your ADS-B
avionics are working properly will prevent any
potential headaches that could arise as the deadline

controller's display as two aircraft in close proximity.
If your aircraft is equipped with ADS-B In, you

Continued on following page...

- 45 -


http://www.faa.gov/other_visit/aviation_industry/airline_operators/airline_safety/safo/ http://www.faa.gov/other_visit/aviation_industry/airline_operators/airline_safety/safo/

Table of Contents for the Digital Edition of Pilot's Guide to Avionics 2017-2018

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Pilot's Guide to Avionics 2017-2018 - Cover3
Pilot's Guide to Avionics 2017-2018 - Cover4
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