Section 121.344a

14 CFR Ch. I (1-1-19 Edition)

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. Except
for airplanes having separate altitude
and airspeed sensors that are an integral part of the flight data recorder
system, 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.
Documentation sufficient to convert
recorded data into the engineering
units and discrete values specified in
the applicable appendix must be maintained by the certificate holder.
(k) Each flight data recorder required
by this section must have an approved
device to assist in locating that recorder under water.
(l) The following airplanes that were
manufactured before August 18, 1997
need not comply with this section, but
must continue to comply with applicable paragraphs of Section 121.343 of this chapter, as appropriate:
(1) Airplanes that meet the State 2
noise levels of part 36 of this chapter
and are subject to Section 91.801(c) of this
chapter, until January 1, 2000. On and
after January 1, 2000, any Stage 2 airplane otherwise allowed to be operated
under Part 91 of this chapter must
comply with the applicable flight data
recorder requirements of this section
for that airplane.
(2) British Aerospace 1-11, General
Dynamics Convair 580, General Dynamics Convair 600, General Dynamics
Convair 640, deHavilland Aircraft Company Ltd. DHC-7, Fairchild Industries
FH 227, Fokker F-27 (except Mark 50),
F-28 Mark 1000 and Mark 4000, Gulfstream Aerospace G-159, Jetstream 4100
Series, Lockheed Aircraft Corporation
Electra 10-A, Lockheed Aircraft Corporation Electra 10-B, Lockheed Air-

craft Corporation Electra 10-E, Lockheed Aircraft Corporation Electra L-
188, Lockheed Martin Model 382 (L-100)
Hercules, Maryland Air Industries, Inc.
F27, Mitsubishi Heavy Industries, Ltd.
YS-11, Short Bros. Limited SD3-30,
Short Bros. Limited SD3-60.
(m) All aircraft subject to the requirements of this section that are
manufactured on or after April 7, 2010,
must have a digital flight data recorder
installed that also - 
(1) Meets the requirements of
Section 25.1459(a)(3), (a)(7), and (a)(8) of this
chapter; and
(2) Retains the 25 hours of recorded
information required in paragraph (h)
of this section using a recorder that
meets the standards of TSO-C124a, or
later revision.
(n) In addition to all other applicable
requirements of this section, all Boeing
737 model airplanes manufactured after
August 18, 2000 must record the parameters listed in paragraphs (a)(88)
through (a)(91) of this section within
the ranges, accuracies, resolutions, and
recording intervals specified in Appendix M to this part. Compliance with
this paragraph is required no later
than February 2, 2011.
[Doc. No. 28109, 62 FR 38378, July 17, 1997; 62
FR 48135, Sept. 12, 1997, as amended by Amdt.
121-300, 68 FR 42936, July 18, 2003; 68 FR 50069,
Aug. 20, 2003; Amdt. 121-338, 73 FR 12565, Mar.
7, 2008; Amdt. 121-342, 73 FR 73178, Dec. 2,
2008; Amdt. 121-338, 74 FR 32800, July 9, 2009]

Section 121.344a Digital flight data recorders
for 10-19 seat airplanes.
(a) Except as provided in paragraph
(f) of this section, no person may operate under this part a turbine-enginepowered airplane having a passenger
seating configuration, excluding any
required crewmember seat, of 10 to 19
seats, that was brought onto the U.S.
register after, or was registered outside
the United States and added to the operator-s U.S. operations specifications
after, October 11, 1991, unless it is
equipped with one or more approved
flight recorders that use a digital
method of recording and storing data
and a method of readily retrieving that
data from the storage medium. On or
before August 20, 2001, airplanes
brought onto the U.S. register after October 11, 1991, must comply with either

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