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547 

Federal Aviation Administration, DOT 

§ 27.1309 

(1) Provide a warning to the 

flightcrew when approximately 10 min-
utes of usable fuel remains in the tank; 
and 

(2) Be independent of the normal fuel 

quantity indicating system. 

(m) Means to indicate to the 

flightcrew the failure of any fuel pump 
installed to show compliance with 
§ 27.955. 

(n) A means to indicate the gas tem-

perature for each turbine engine. 

(o) A means to enable the pilot to de-

termine the torque of each turbine en-
gine, if a torque limitation is estab-
lished for that engine under § 27.1521(e). 

(p) For each turbine engine, an indi-

cator to indicate the functioning of the 
powerplant ice protection system. 

(q) An indicator for the fuel filter re-

quired by § 27.997 to indicate the occur-
rence of contamination of the filter at 
the degree established by the applicant 
in compliance with § 27.955. 

(r) For each turbine engine, a warn-

ing means for the oil strainer or filter 
required by § 27.1019, if it has no bypass, 
to warn the pilot of the occurrence of 
contamination of the strainer or filter 
before it reaches the capacity estab-
lished in accordance with § 27.1019(a)(2). 

(s) An indicator to indicate the func-

tioning of any selectable or control-
lable heater used to prevent ice clog-
ging of fuel system components. 

(t) For rotorcraft for which a 30-sec-

ond/2-minute OEI power rating is re-
quested, a means must be provided to 
alert the pilot when the engine is at 
the 30-second and the 2-minute OEI 
power levels, when the event begins, 
and when the time interval expires. 

(u) For each turbine engine utilizing 

30-second/2-minute OEI power, a device 
or system must be provided for use by 
ground personnel which— 

(1) Automatically records each usage 

and duration of power at the 30-second 
and 2-minute OEI levels; 

(2) Permits retrieval of the recorded 

data; 

(3) Can be reset only by ground main-

tenance personnel; and 

(4) Has a means to verify proper oper-

ation of the system or device. 

(v) Warning or caution devices to sig-

nal to the flight crew when ferromag-

netic particles are detected by the chip 
detector required by § 27.1337(e). 

[Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as 
amended by Amdt. 27–9, 39 FR 35462, Oct. 1, 
1974; Amdt. 27–23, 53 FR 34214, Sept. 2, 1988; 
Amdt. 27–29, 59 FR 47767, Sept. 16, 1994; Amdt. 
27–37, 64 FR 45095, Aug. 18, 1999; 64 FR 47563, 
Aug. 31, 1999; Amdt. 27–51, 88 FR 8737, Feb. 10, 
2023] 

§ 27.1307

Miscellaneous equipment. 

The following is the required mis-

cellaneous equipment: 

(a) An approved seat for each occu-

pant. 

(b) An approved safety belt for each 

occupant. 

(c) A master switch arrangement. 
(d) An adequate source of electrical 

energy, where electrical energy is nec-
essary for operation of the rotorcraft. 

(e) Electrical protective devices. 

§ 27.1309

Equipment, systems, and in-

stallations. 

The equipment, systems, and instal-

lations whose functioning is required 
by this subchapter must be designed 
and installed to ensure that they per-
form their intended functions under 
any foreseeable operating condition. 
For any item of equipment or system 
whose failure has not been specifically 
addressed by another requirement in 
this chapter, the following require-
ments also apply: 

(a) The design of each item of equip-

ment, system, and installation must be 
analyzed separately and in relation to 
other rotorcraft systems and installa-
tions to determine and identify any 
failure that would affect the capability 
of the rotorcraft or the ability of the 
crew to perform their duties in all op-
erating conditions. 

(b) Each item of equipment, system, 

and installation must be designed and 
installed so that: 

(1) The occurrence of any cata-

strophic failure condition is extremely 
improbable; 

(2) The occurrence of any major fail-

ure condition is no more than improb-
able; and 

(3) For the occurrence of any other 

failure condition between major and 
catastrophic, the probability of the 
failure condition must be inversely 
proportional to its consequences. 

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