Airworthiness Directives; Boeing Model
767-200, -300, and -400ER Series Airplanes
AGENCY: Federal Aviation
Administration (FAA), DOT.
ACTION: Final rule.
SUMMARY: We are adopting a new
airworthiness directive (AD) for certain Boeing Model
200, -300, and -400ER series airplanes.
This AD requires installing new relay(s), circuit
applicable, and wiring to allow the
flightcrew to turn off electrical power to the in-flight
entertainment (IFE) systems and certain
circuit breakers through a utility bus switch, and doing
specified actions. This AD results from
an IFE systems review.
We are issuing
this AD to ensure that
the flightcrew is able to turn off electrical power to
IFE systems and other non-essential electrical
systems through a switch in the flight compartment. The
flightcrew's inability to turn off power to
IFE systems and other non-essential electrical systems
during a non-normal or emergency situation
could result in the inability to control smoke or fumes
in the airplane flight deck or cabin.
DATES: This AD is effective
December 26, 2008.
Request To Clarify Analysis and
Background of the IFE System Review
JAL states that the technical analysis
and engineering background of the IFE system should be
clearly explained in the NPRM. JAL also
states that the NPRM does not clearly address Transistor
Transistor Logic (TTL) power
consumption, location or quantity of the units,
operation during flight,
or system shutdown in the event of
smoke. For example, JAL points out that the
of the NPRM states that the IFE review
did not consider systems that provide only audio signals
each passenger seat or the passenger
flight information system, and in-seat power supply
systems that provide power to less than
20 percent of the total passenger seats. JAL states that
NPRM provides no engineering analysis as
to why 40 seats with an ISPS system are a concern on a
150-seat airplane, while 60 seats with
an ISPS system on a 350-seat airplane is not a concern.
also states that this kind of definition
leads to confusion (including IFE development and
configuration in the future). JAL also
states that the technical definition and background on
must be clear and properly understood by
We infer that JAL requests that we
clarify the analysis and background of the IFE system
and we agree to provide clarification.
The ''Discussion'' section of the NPRM provides the
background information that led to FAA
regulatory actions requiring the removal of power from
complex IFE system installations in the
event of smoke or fire, without affecting other systems
essential for safe flight and landing
and without the use of circuit breakers for power
concerns related to TTL power
consumption, etc., are immaterial to correcting the
which is the inability to disconnect power from the
IFE system in the event of smoke or fire. The
FAA study focused on IFE installations
that are complex in terms of electrical circuitry and
demands. This study excluded
non-essential systems that are simple in design and
demand low power
for operation. Due to the large number
of ISPS installations, we reviewed only those ISPS
installations that provided power to
more than 20 percent of the total passenger seats.
requirements of this AD apply to all
airplanes that have any seats equipped with power
applicability of this AD is not limited
only airplanes having more than 20 percent of the
seats equipped with power supplies. No change to the
AD is necessary in this regard.