page-36

345

Federal Aviation Administration, DOT

§ 125.243

changed in any way, other than
changes necessary to:

(1) Accomplish analog to digital con-

version of the signal;

(2) Format a digital signal to be

DFDR compatible; or

(3) Eliminate a high frequency com-

ponent of a signal that is outside the
operational bandwidth of the sensor.

(b) An original sensor signal for any

flight recorder parameter required to
be recorded under § 125.226 may be fil-
tered only if the recorded signal value
continues to meet the requirements of
Appendix D or E of this part, as appli-
cable.

§ 125.226(a) (12) through (17), (42), or (88),
or the corresponding parameter in Ap-
pendix D of this part, if the recorded
signal value is filtered and does not
meet the requirements of Appendix D
or E of this part, as applicable, the cer-
tificate holder must:

(1) Remove the filtering and ensure

that the recorded signal value meets
the requirements of Appendix D or E of
this part, as applicable; or

(2) Demonstrate by test and analysis

that the original sensor signal value
can be reconstructed from the recorded
data. This demonstration requires
that:

(i) The FAA determine that the pro-

cedure and the test results submitted
by the certificate holder as its compli-
ance with paragraph (c)(2) of this sec-
tion are repeatable; and

(ii) The certificate holder maintains

documentation of the procedure re-
quired to reconstruct the original sen-
sor signal value. This documentation is
also subject to the requirements of
§ 125.226(i).

(d)

Compliance.

Compliance is re-

quired as follows:

(1) No later than October 20, 2011,

each operator must determine, for each
airplane it operates, whether the air-
plane’s DFDR system is filtering any of
the parameters listed in paragraph (c)
of this section. The operator must cre-
ate a record of this determination for
each airplane it operates, and maintain
it as part of the correlation docu-
mentation required by § 125.226(j)(3) of
this part.

(2) For airplanes that are not fil-

tering any listed parameter, no further

action is required unless the airplane’s
DFDR system is modified in a manner
that would cause it to meet the defini-
tion of filtering on any listed param-
eter.

(3) For airplanes found to be filtering

a parameter listed in paragraph (c) of
this section, the operator must either:

(i) No later than April 21, 2014, re-

move the filtering; or

(ii) No later than April 22, 2013, sub-

mit the necessary procedure and test
results required by paragraph (c)(2) of
this section.

(4) After April 21, 2014, no aircraft

flight data recording system may filter
any parameter listed in paragraph (c)
of this section that does not meet the
requirements of Appendix D or E of
this part, unless the certificate holder
possesses test and analysis procedures
and the test results that have been ap-
proved by the FAA. All records of
tests, analysis and procedures used to
comply with this section must be
maintained as part of the correlation
documentation required by
§ 125.226(j)(3) of this part.

[Doc. No. FAA–2006–26135, 75 FR 7356, Feb. 19,
2010]

Subpart G—Maintenance

§ 125.241

Applicability.

This subpart prescribes rules, in addi-

tion to those prescribed in other parts
of this chapter, for the maintenance of
airplanes, airframes, aircraft engines,
propellers, appliances, each item of
survival and emergency equipment,
and their component parts operated
under this part.

§ 125.243

Certificate holder’s respon-

sibilities.

(a) With regard to airplanes, includ-

ing airframes, aircraft engines, propel-
lers, appliances, and survival and emer-
gency equipment, operated by a certifi-
cate holder, that certificate holder is
primarily responsible for—

(1) Airworthiness;
(2) The performance of maintenance,

preventive maintenance, and alter-
ation in accordance with applicable
regulations and the certificate holder’s
manual;

VerDate Sep<11>2014

08:20 May 17, 2019

Jkt 247048

PO 00000

Frm 00355

Fmt 8010

Sfmt 8002

Y:\SGML\247048.XXX

247048