Federal Aviation Administration, DOT

Section 135.156

that meets as a minimum the requirements for Class B equipment in Technical Standard Order (TSO)-C151.
(Approved by the Office of Management and
Budget under control number 2120-0631)

(c) Airplane Flight Manual. The Airplane Flight Manual shall contain appropriate procedures for - 
(1) The use of the terrain awareness
and warning system; and
(2) Proper flight crew reaction in response to the terrain awareness and
warning system audio and visual warnings.
[Doc. No. 29312, 65 FR 16755, Mar. 29, 2000]

Section 135.155 Fire
extinguishers:
Passenger-carrying aircraft.
No person may operate an aircraft
carrying passengers unless it is
equipped with hand fire extinguishers
of an approved type for use in crew and
passenger compartments as follows - 
(a) The type and quantity of extinguishing agent must be suitable for the
kinds of fires likely to occur;
(b) At least one hand fire extinguisher must be provided and conveniently located on the flight deck for
use by the flight crew; and
(c) At least one hand fire extinguisher must be conveniently located
in the passenger compartment of each
aircraft having a passenger seating
configuration, excluding any pilot seat,
of at least 10 seats but less than 31
seats.
Section 135.156 Flight data recorders: filtered data.
(a) A flight data signal is filtered
when an original sensor signal has been
changed in any way, other than
changes necessary to:
(1) Accomplish analog to digital conversion of the signal;
(2) Format a digital signal to be
DFDR compatible; or
(3) Eliminate a high frequency component 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 Section 135.152 may be filtered only if the recorded signal value
continues to meet the requirements of
Appendix D or F of this part, as applicable.

(c) For a parameter described in
Section 135.152(h)(12) through (17), (42), or (88),
or the corresponding parameter in Appendix D of this part, if the recorded
signal value is filtered and does not
meet the requirements of Appendix D
or F of this part, as applicable, the certificate holder must:
(1) Remove the filtering and ensure
that the recorded signal value meets
the requirements of Appendix D or F 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 procedure and test results submitted by
the certificate holder as its compliance
with paragraph (c)(2) of this section are
repeatable; and
(ii) The certificate holder maintains
documentation of the procedure required to reconstruct the original sensor signal value. This documentation is
also subject to the requirements of
Section 135.152(e).
(d) Compliance. Compliance is required as follows:
(1) No later than October 20, 2011,
each operator must determine, for each
aircraft on its operations specifications, whether the aircraft-s DFDR system is filtering any of the parameters
listed in paragraph (c) of this section.
The operator must create a record of
this determination for each aircraft it
operates, and maintain it as part of the
correlation documentation required by
Section 135.152 (f)(1)(iii) or (f)(2)(iii) of this
part as applicable.
(2) For aircraft that are not filtering
any listed parameter, no further action
is required unless the aircraft-s DFDR
system is modified in a manner that
would cause it to meet the definition of
filtering on any listed parameter.
(3) For aircraft found to be filtering a
parameter listed in paragraph (c) of
this section the operator must either:
(i) No later than April 21, 2014, remove the filtering; or
(ii) No later than April 22, 2013, submit 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

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