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Federal Aviation Administration, DOT 

§ 121.309 

turbine engine powered airplanes to 
provide equivalent safety, no person 
may conduct any operation under this 
part without the following engine in-
struments: 

(a) A carburetor air temperature in-

dicator for each engine. 

(b) A cylinder head temperature indi-

cator for each air-cooled engine. 

(c) A fuel pressure indicator for each 

engine. 

(d) A fuel flowmeter or fuel mixture 

indicator for each engine not equipped 
with an automatic altitude mixture 
control. 

(e) A means for indicating fuel quan-

tity in each fuel tank to be used. 

(f) A manifold pressure indicator for 

each engine. 

(g) An oil pressure indicator for each 

engine. 

(h) An oil quantity indicator for each 

oil tank when a transfer or separate oil 
reserve supply is used. 

(i) An oil-in temperature indicator 

for each engine. 

(j) A tachometer for each engine. 
(k) An independent fuel pressure 

warning device for each engine or a 
master warning device for all engines 
with a means for isolating the indi-
vidual warning circuits from the mas-
ter warning device. 

(l) A device for each reversible pro-

peller, to indicate to the pilot when the 
propeller is in reverse pitch, that com-
plies with the following: 

(1) The device may be actuated at 

any point in the reversing cycle be-
tween the normal low pitch stop posi-
tion and full reverse pitch, but it may 
not give an indication at or above the 
normal low pitch stop position. 

(2) The source of indication must be 

actuated by the propeller blade angle 
or be directly responsive to it. 

§ 121.308 Lavatory fire protection. 

(a) Except as provided in paragraphs 

(c) and (d) of this section, no person 
may operate a passenger-carrying air-
plane unless each lavatory in the air-
plane is equipped with a smoke detec-
tor system or equivalent that provides 
a warning light in the cockpit or pro-
vides a warning light or audio warning 
in the passenger cabin which would be 
readily detected by a flight attendant, 
taking into consideration the posi-

tioning of flight attendants throughout 
the passenger compartment during var-
ious phases of flight. 

(b) Except as provided in paragraph 

(c) of this section, no person may oper-
ate a passenger-carrying airplane un-
less each lavatory in the airplane is 
equipped with a built-in fire extin-
guisher for each disposal receptacle for 
towels, paper, or waste located within 
the lavatory. The built-in fire extin-
guisher must be designed to discharge 
automatically into each disposal recep-
tacle upon occurrence of a fire in the 
receptacle. 

(c) Until December 22, 1997, a certifi-

cate holder described in § 121.2(a) (1) or 
(2) may operate an airplane with a pas-
senger seat configuration of 30 or fewer 
seats that does not comply with the 
smoke detector system requirements 
described in paragraph (a) of this sec-
tion and the fire extinguisher require-
ments described in paragraph (b) of 
this section. 

(d) After December 22, 1997, no person 

may operate a nontransport category 
airplane type certificated after Decem-
ber 31, 1964, with a passenger seat con-
figuration of 10–19 seats unless that 
airplane complies with the smoke de-
tector system requirements described 
in paragraph (a) of this section, except 
that the smoke detector system or 
equivalent must provide a warning 
light in the cockpit or an audio warn-
ing that would be readily detected by 
the flightcrew. 

[Doc. No. 28154, 60 FR 65929, Dec. 20, 1995] 

§ 121.309 Emergency equipment. 

(a) 

General: 

No person may operate 

an airplane unless it is equipped with 
the emergency equipment listed in this 
section and in § 121.310. 

(b) Each item of emergency and flo-

tation equipment listed in this section 
and in §§ 121.310, 121.339, and 121.340— 

(1) Must be inspected regularly in ac-

cordance with inspection periods estab-
lished in the operations specifications 
to ensure its condition for continued 
serviceability and immediate readiness 
to perform its intended emergency pur-
poses; 

(2) Must be readily accessible to the 

crew and, with regard to equipment lo-
cated in the passenger compartment, 
to passengers;