Federal Aviation Administration, DOT

Section 121.344a

the requirements in this section or the
applicable paragraphs in Section 135.152 of this
chapter. In addition, by August 20, 2001.
(1)
The
parameters
listed
in
SectionSection 121.344(a)(1) through 121.344(a)(18) of
this part must be recorded with the
ranges, accuracies, and resolutions
specified in Appendix B of part 135 of
this chapter, except that - 
(i) Either the parameter listed in
Section 121.344 (a)(12) or (a)(15) of this part
must be recorded; either the parameters listed in Section 121.344(a)(13) or (a)(16)
of this part must be recorded; and either
the
parameter
listed
in
Section 121.344(a)(14) or (a)(17) of this part
must be recorded.
(ii) For airplanes with more than two
engines, the parameter described in
Section 121.344(a)(18) of this part must also be
recorded if sufficient capacity is available on the existing recorder to record
that parameter;
(iii)
Parameters
listed
in
SectionSection 121.344(a)(12) through 121.344(a)(17) of
this part each may be recorded from a
single source;
(iv) Any parameter for which no
value is contained in Appendix B of
part 135 of this chapter must be recorded within the ranges, accuracies,
and resolutions specified in Appendix
M of this part.
(2) Commensurate with the capacity
of the recording system (FDAU or
equivalent and the DFDR), the parameters listed in SectionSection 121.344(a)(19) through
121.344(a)(22) of this part also must be
recorded within the ranges, accuracies,
resolutions, and recording intervals
specified in Appendix B of part 135 of
this chapter.
(3) The approved flight recorder required by this section must be installed
as soon as practicable, but no later
than the next heavy maintenance
check or equivalent after August 18,
1999. A heavy maintenance check is
considered to be any time an airplane
is scheduled to be out of service for 4
more days and is scheduled to include
access to major structural components.
(b) For a turbine-engine-powered airplanes having a passenger seating configuration, excluding any required
crewmember seat, of 10 to 19 seats, that
are manufactured after August 18, 2000.
(1)
The
parameters
listed
in
SectionSection 121.344(a)(1) through 121.344(a)(57) of

this part, must be recorded within the
ranges, accuracies, resolutions, and recording intervals specified in Appendix
M of this part.
(2) Commensurate with the capacity
of the recording system, all additional
parameters listed in Section 121.344(a) of this
part for which information sources are
installed and which are connected to
the recording system, must be recorded
within the ranges, accuracies, resolutions, and sampling intervals specified
in Appendix M of this part by August
20, 2001.
(c) For all turbine-engine-powered
airplanes having a passenger seating
configuration, excluding any required
crewmember seats, of 10 to 19 seats,
that are manufactured after August 19,
2002,
the
parameters
listed
in
Section 121.344(a)(1) through (a)(88) of this
part must be recorded within the
ranges, accuracies, resolutions, and recording intervals specified in Appendix
M of this part.
(d) Each flight data recorder system
required by this section must be installed in accordance with the requirements of Section 23.1459(a) (except paragraphs
(a)(3)(ii) and (6)), (b), (d) and (e) of this
chapter. A correlation must be established between the values recorded by
the flight data recorder and the corresponding values being measured. The
correlation must contain a sufficient
number of correlation points to accurately establish the conversion from
the recorded values to engineering
units or discrete state over the full operating range of the parameter. A single correlation may be established for
any group of airplanes - 
(1) That are of the same type;
(2) On which the flight recorder system and its installation are the same;
and
(3) On which there is no difference in
the type design with respect to the installation of those sensors associated
with the flight data recorder system.
Correlation documentation must be
maintained by the certificate holder.
(e) All airplanes subject to this section are also subject to the requirements and exceptions stated in
Section 121.344(g) through (k) and Section 121.346.
(f) For airplanes that were manufactured before August 18, 1997, the following airplane types need not comply

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