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453 

Federal Aviation Administration, DOT 

§ 135.156 

(TSO)–C151. The airplane must also in-
clude an approved terrain situational 
awareness display. 

(2) No person may operate a turbine- 

powered airplane configured with 6 to 9 
passenger seats, excluding any pilot 
seat, unless that airplane is equipped 
with an approved terrain awareness 
and warning system that meets as a 
minimum the requirements for Class B 
equipment in Technical Standard Order 
(TSO)–C151. 

(b) 

Airplanes manufactured on or before 

March 29, 2002: 

(1) No person may operate a turbine- 

powered airplane configured with 10 or 
more passenger seats, excluding any 
pilot seat, after March 29, 2005, unless 
that airplane is equipped with an ap-
proved terrain awareness and warning 
system that meets the requirements 
for Class A equipment in Technical 
Standard Order (TSO)–C151. The air-
plane must also include an approved 
terrain situational awareness display. 

(2) No person may operate a turbine- 

powered airplane configured with 6 to 9 
passenger seats, excluding any pilot 
seat, after March 29, 2005, unless that 
airplane is equipped with an approved 
terrain awareness and warning system 
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