441 

Federal Aviation Administration, DOT 

§ 135.156 

that meets as a minimum the require-
ments for Class B equipment in Tech-
nical Standard Order (TSO)–C151. 

(Approved by the Office of Management and 
Budget under control number 2120–0631) 

(c) 

Airplane Flight Manual. 

The Air-

plane Flight Manual shall contain ap-
propriate procedures for— 

(1) The use of the terrain awareness 

and warning system; and 

(2) Proper flight crew reaction in re-

sponse to the terrain awareness and 
warning system audio and visual warn-
ings. 

[Doc. No. 29312, 65 FR 16755, Mar. 29, 2000] 

§ 135.155

Fire extinguishers: Pas-

senger-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 extin-

guishing agent must be suitable for the 
kinds of fires likely to occur; 

(b) At least one hand fire extin-

guisher must be provided and conven-
iently located on the flight deck for 
use by the flight crew; and 

(c) At least one hand fire extin-

guisher 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. 

§ 135.156

Flight data recorders: fil-

tered 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 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 § 135.152 may be fil-
tered only if the recorded signal value 
continues to meet the requirements of 
Appendix D or F of this part, as appli-
cable. 

(c) For a parameter described in 

§ 135.152(h)(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 F 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 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 pro-

cedure 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 re-
quired to reconstruct the original sen-
sor signal value. This documentation is 
also subject to the requirements of 
§ 135.152(e). 

(d) 

Compliance. 

Compliance is re-

quired as follows: 

(1) No later than October 20, 2011, 

each operator must determine, for each 
aircraft on its operations specifica-
tions, whether the aircraft’s DFDR sys-
tem 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 
§ 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, 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 

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