134
14 CFR Ch. I (1–1–19 Edition)
§ 121.344a
this chapter. A correlation must be es-
tablished between the values recorded
by the flight data recorder and the cor-
responding values being measured. The
correlation must contain a sufficient
number of correlation points to accu-
rately establish the conversion from
the recorded values to engineering
units or discrete state over the full op-
erating range of the parameter. Except
for airplanes having separate altitude
and airspeed sensors that are an inte-
gral part of the flight data recorder
system, a single correlation may be es-
tablished for any group of airplanes—
(1) That are of the same type;
(2) On which the flight recorder sys-
tem and its installation are the same;
and
(3) On which there is no difference in
the type design with respect to the in-
stallation 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 main-
tained by the certificate holder.
(k) Each flight data recorder required
by this section must have an approved
device to assist in locating that re-
corder 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 applica-
ble paragraphs of § 121.343 of this chap-
ter, as appropriate:
(1) Airplanes that meet the State 2
noise levels of part 36 of this chapter
and are subject to § 91.801(c) of this
chapter, until January 1, 2000. On and
after January 1, 2000, any Stage 2 air-
plane 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 Dynam-
ics Convair 600, General Dynamics
Convair 640, deHavilland Aircraft Com-
pany Ltd. DHC–7, Fairchild Industries
FH 227, Fokker F–27 (except Mark 50),
F–28 Mark 1000 and Mark 4000, Gulf-
stream Aerospace G–159, Jetstream 4100
Series, Lockheed Aircraft Corporation
Electra 10–A, Lockheed Aircraft Cor-
poration Electra 10–B, Lockheed Air-
craft Corporation Electra 10–E, Lock-
heed 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 re-
quirements 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
§ 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 param-
eters listed in paragraphs (a)(88)
through (a)(91) of this section within
the ranges, accuracies, resolutions, and
recording intervals specified in Appen-
dix 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]
§ 121.344a
Digital flight data recorders
for 10–19 seat airplanes.
(a) Except as provided in paragraph
(f) of this section, no person may oper-
ate under this part a turbine-engine-
powered 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 op-
erator’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 Oc-
tober 11, 1991, must comply with either
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