The three primary players in the development of the requirements and
the technology of Mode S were Lincoln Labs, the technical arm, the AOPA,
a strong voice from the user community, and the FAA, the government
regulating arm. However, many other organizations also played a strong
role in the shaping of the air traffic control systems of the 1960s. On
this page, we provide you with some background information for some of
these groups.
Lincoln Labs was originally established to deal with a different type
of surveillance problem: detecting enemy military aircraft. The
Department of Defense felt that a plausible scenario existed where
Soviet bombers with nuclear weapons would ``fly over the north polar
region at high latitude and then descend as it approached its
target.'' Ground radar could be detected and avoided, making the
aircraft virtually undetectable.
Over the years, Lincoln continued its efforts with surveillance
technologies. In 1949 the Air Force contracted Lincoln to work on the
``Semi-Automatic Ground Environment'' (SAGE) system. This system used
multiple radar sites to display all the aircraft within a designated
area on the radar screen, making it possible for military controllers
to vector air defense fighters toward invading enemy aircraft.
SAGE, a system of radar stations linked to a centralized digital
computer, was essentially a predecessor to modern air traffic control
systems. Because of these previous ventures, Lincoln Labs researchers
had extensive knowledge of radar and communications. When the FAA
finally decided to fund Lincoln Labs to design a new technology, the Air
Traffic Group was officially formed. There were originally 5-6 members
in the group, recruited from the other divisions at Lincoln, primarily
the Radar and Communications Group.
Many of those involved with the initial development of Mode S had
graduated from MIT with backgrounds in electrical engineering and
communications design. Paul Drouilhet, for instance, had participated
in the development and test of long-range, air-ground communications.
Other members included Herb Weiss ('40), Edward Kelly ('45), Walter
Wells ('52), George Colby ('53), Thomas Goblick ('58), Jerry Welch
('59), and Bill Harman ('68).
Air Traffic Control Group (#92) Pamphlet
The collision of two aircraft over the Grand Canyon in 1956 that
killed 128 people raised awareness that the existing systems of
aircraft separation were not appropriate for the increasingly crowded
skies. The FAA was formed as the Federal Aviation Agency in 1958 with
the passing of the Federal Aviation Act. Its purpose was to establish
and run a broad air traffic control system to maintain safe separation
of all commercial aircraft through all phases of flight. It was also
given jurisdiction over all other safety-related matters for
aviation.
In reality, the FAA's control over aviation matters was not complete,
since, as a government agency, they needed to balance the needs of the
various politically active factions of the aviation community.
Additionally, the FAA tended to rely on external advisors in technical
matters. Therefore, when the ATCAC report indicated that a new air
traffic control system was needed, the FAA looked for a suitable
agency to carry out the task of designing such a system.
The AOPA was founded in 1939 with the goals of making flying safer, more
affordable and more fun. It's the largest civil aviation organization in
the world, with 365,000 members; this includes more than half the pilots
in the United States. The organization faced its first major challenge
during World War II, when the government attempted to ban all civilian
flying. The AOPA helped fend off this measure by establishing an
identification program, but continued to be skeptical of future
government regulation efforts.
As air traffic control efforts increased, the AOPA fought to keep
costs of mandatory equipment low, and increased in size and influence.
AOPA also helped pilots by educating them about new navigation tools,
and published several informative magazines designed for the general
aviation community. More importantly, the AOPA legislative lobbying
group became stronger and led general aviation in efforts to reduce
costs and potential restrictions.
The AOPA served an important role in representing the general
aviation community and its interests. Their philosophy was best
summarized by Max Karant, the founding editor of the AOPA
Pilot and a prominent leader in the AOPA, ``Whatever ultimate system we
come up with must serve all pilots who wish to use it.'' To this end,
the AOPA consistently fought off ``efforts to price [private flying] out
of the air with costly, unnecessary equipment requirements and more and
more airspace regulations.'' The AOPA's influence was so
strongly felt that even the development of new technologies was
influenced by the general aviation community's desire to keep flying
costs as low as possible.
The Professional Air Traffic Controllers Organization (PATCO) is one
of several air traffic controllers' organizations around the world.
In their own words, "PATCO ... is an air traffic controller and weather
observer's Union representing controllers and weather observers employed
in the Federal Aviation Administration's Federal Contract Tower
locations across the nation." PATCO was one of the most militant and
vocal controller organizations, playing a large part in FAA-labor
relations. They played a primary role in pushing the FAA to install new
air traffic equipment and hire more controllers during the budget cuts
of the 1960's. It was PATCO who ordered "Operation Air Safety", which
declared that controllers should adhere to established separation
standards, leading to the first of many "slowdowns" in air traffic.
They also ordered the official "sickouts" that increased delay of air
traffic either further. Membership in PATCO is restricted to controllers
alone.
The Air Traffic Control Association was established in 1956 by a
group of air traffic controllers, and is "dedicated to progress in the
science of air traffic control and the preservation of a safe flight
environment." ATCA is not limited in membership to air traffic
controllers, but instead also includes providers of air traffic control,
system architects, manufacturers, suppliers, system operators, and
users, anyone who "has an interest in promoting and encouragin the
advancement of aviation and air traffic control." It represents the
"broad spectrum of civil-military cooperation typical of global flying
activities." The ATCA was another strong voice in expressing controller
discontent and pushing for the improvement of the existing system in the
1960's.
The Air Line Pilots Association was founded in 1931 and represents
59,000 airline pilots at 49 US and Canadian airlines. Its purpose is to
"promote and champion all aspects of aviation safety throughout all
segments of the aviation community; to represent, in both specific and
general respects, the collective interests of all pilots in commercial
aviation; ... to be a strong, forceful advocate of the airline piloting
profession..." The ALPA represents the other significant portion of the
piloting community from the AOPA. Though their concerns diverge at
times, the ALPA and AOPA often combined forces in the 1960's to pressure
the FAA to improve the technology and change their policies.
The Air Transportation Association of America was founded in 1936 and
is the only trade organizatoin for the principal US airlines. Its
purpose is to "support and assist its members by promoting the air
transport industry and the safety, cost effectiveness, and technological
advancement of its operations; advocating commong industry positions
before state and local governments; conducting designated industry-wide
programs; and assuring governmental and public understanding of all
aspects of air transport." The ATA has played an active and important
role in aviation-related legislation, "including the creation of the
Civil Aeronautics Board, the creation of the air traffic control system,
and airline deregulation." The ATA, along with all the above agencies
had a strong voice in criticizing the FAA's rate of progress in the
1960's.