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Updated August 1, 2024

Secondary Cockpit Barriers for Airline Aircraft

For the past two decades, there has been continuing policy
interest in enhancing airline in-flight security with
secondary cockpit barriers. A secondary cockpit barrier,
also known as an installed physical secondary barrier
(IPSB), typically consists of a lockable gate constructed of
metal rods, bars, and cables or similar intrusion-resistant
materials that retracts when not in use. A suitable barrier is
designed to be positioned between the aircraft cabin and the
cockpit; occupy sufficient space so that it cannot be
circumvented by going over, under, or around it; and be
resistant to intrusion, including forceful attempts to pull it
open or down or push through it. An IPSB primarily serves
as a means to prevent or deter access to the aircraft cockpit
when a cockpit door is briefly opened, for example, when a
pilot exits the cockpit to use the lavatory, when flight crew
are served food or during shift changes on long flights.
Historical Context
Following the September 11, 2001 (9/11), terrorist attacks,
the Federal Aviation Administration (FAA) mandated
hardened cockpit doors that are resistant to forcible
intrusion and small firearms on most passenger airline
aircraft and large, all-cargo airplanes operated in the United
States. Regulations generally require those doors to remain
closed and locked for the entire duration of a flight with
few exceptions, and special procedural measures must be
taken in those rare instances when a door is opened to deter
potential attempts to breach a cockpit. However, security
concerns over potential flight deck breaches by terrorists or
unruly passengers have prompted continued interest in
secondary cockpit barriers.
The investigation of the National Commission on Terrorist
Attacks Upon the United States (the 9/11 Commission) did
not find conclusive evidence as to how the 9/11 hijackers
gained access to the aircraft flight decks in those attacks,
but did find evidence of the terrorists making specific
inquiries and plotting to exploit opportunities when cockpit
doors were opened. The pre-9/11 industry-wide common
strategy of cooperating with hijackers and avoiding direct
confrontation would have rendered physical barriers, such
as hardened cockpit doors and secondary barriers, largely
irrelevant. After the 9/11 attacks, the installation of
hardened cockpit doors and implementation of procedures
to defend the cockpit against intrusions have prompted
reviews of potential vulnerabilities, including during times
when cockpit doors are opened in flight.
In 2004, United Airlines and Northwest Airlines (Northwest
later merged with Delta) equipped some widebody jets with
secondary cockpit barriers; other airlines did not follow
suit. In 2007, the Air Line Pilots Association (ALPA)
published a position paper urging government action to
mandate secondary cockpit barriers by 2010; the issue has
remained a top priority for the organization since. In 2011,

RTCA, Inc., an independent standards development
organization for aviation, developed guidance on the design
and operational procedures for aircraft secondary barrier
systems. In 2015, FAA issued an advisory recognizing the
RTCA guidance on secondary barriers as an acceptable
alternative to commonly employed methods that rely on
cabin crew monitoring and impeding access to the flight
deck with galley carts or other aircraft cabin equipment.
Congressona Act on
Since the 108th Congress in 2004 (see H.R. 4801), various
legislative proposals have been introduced seeking action to
require secondary cockpit barriers on certain commercial
aircraft. In the 113th Congress, the Saracini Aviation Safety
Act of 2013 (H.R. 1775, S. 1495) was introduced. The bill,
named after Captain Victor J. Saracini, whose hijacked
airplane was flown into the South Tower of the World
Trade Center in New York City on 9/11, would have
mandated the installation and use of secondary cockpit
barriers on all aircraft that are required by regulation to
have hardened cockpit doors. This generally includes
airliners with 20 or more passenger seats and any all-cargo
aircraft with a payload capacity greater than 7,500 pounds.
Similar legislation offered in the 114th Congress (H.R. 911,
S. 911) and 115th Congress (H.R. 911) would have
mandated secondary cockpit barriers on commercial aircraft
with more than 75 passenger seats or a maximum gross
takeoff weight of 75,000 pounds. Section 336 of the FAA
Reauthorization Act of 2018 (P.L. 115-254), titled the
Saracini Aviation Safety Act of 2018, mandated the
installation of secondary flight deck barriers on all newly
manufactured aircraft delivered to U.S. passenger airlines.
Section 350 of the FAA Reauthorization Act of 2024 (P.L.
118-63) requires FAA to convene a rulemaking committee
to provide recommendations regarding the installation of
secondary cockpit barriers on passenger airliners operated
by U.S. air carriers that are not otherwise subject to existing
or proposed regulations, including existing aircraft. The act
directs FAA to subsequently issue a final rule mandating
the installation of secondary barriers on such aircraft that
takes into consideration the findings and recommendations
of the committee. The time frame for completing all steps
in issuing a final rule would be roughly 42 years, although
the final rule may have a separate timeline for compliance.
Regulatory Action
In response to the statutory mandate in the FAA
Reauthorization Act of 2018, FAA convened an Aviation
Rulemaking Advisory Committee Working Group on flight
deck secondary barriers in March 2019. The working
group's February 2020 report to the FAA contained cost
estimates and recommendations regarding the engineering
and design of IPSBs, installation, crew training, and
operational procedures. It advised against expanding the

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