640 

14 CFR Ch. I (1–1–24 Edition) 

§ 29.1011 

(d) The controls for any fuel jetti-

soning system must be designed to 
allow flight personnel (minimum crew) 
to safely interrupt fuel jettisoning dur-
ing any part of the jettisoning oper-
ation. 

(e) The fuel jettisoning system must 

be designed to comply with the power-
plant installation requirements of 
§ 29.901(c). 

(f) An auxiliary fuel jettisoning sys-

tem which meets the requirements of 
paragraphs (a), (b), (d), and (e) of this 
section may be installed to jettison ad-
ditional fuel provided it has separate 
and independent controls. 

[Amdt. 29–26, 53 FR 34218, Sept. 2, 1988] 

O

IL

S

YSTEM

 

§ 29.1011

Engines: general. 

(a) Each engine must have an inde-

pendent oil system that can supply it 
with an appropriate quantity of oil at a 
temperature not above that safe for 
continuous operation. 

(b) The usable oil capacity of each 

system may not be less than the prod-
uct of the endurance of the rotorcraft 
under critical operating conditions and 
the maximum allowable oil consump-
tion of the engine under the same con-
ditions, plus a suitable margin to en-
sure adequate circulation and cooling. 
Instead of a rational analysis of endur-
ance and consumption, a usable oil ca-
pacity of one gallon for each 40 gallons 
of usable fuel may be used for recipro-
cating engine installations. 

(c) Oil-fuel ratios lower than those 

prescribed in paragraph (c) of this sec-
tion may be used if they are substan-
tiated by data on the oil consumption 
of the engine. 

(d) The ability of the engine and oil 

cooling provisions to maintain the oil 
temperature at or below the maximum 
established value must be shown under 
the applicable requirements of §§ 29.1041 
through 29.1049. 

[Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as 
amended by Amdt. 29–26, 53 FR 34218, Sept. 2, 
1988] 

§ 29.1013

Oil tanks. 

(a) 

Installation.  Each oil tank instal-

lation must meet the requirements of 
§ 29.967. 

(b) 

Expansion space. Oil tank expan-

sion space must be provided so that— 

(1) Each oil tank used with a recipro-

cating engine has an expansion space of 
not less than the greater of 10 percent 
of the tank capacity or 0.5 gallon, and 
each oil tank used with a turbine en-
gine has an expansion space of not less 
than 10 percent of the tank capacity; 

(2) Each reserve oil tank not directly 

connected to any engine has an expan-
sion space of not less than two percent 
of the tank capacity; and 

(3) It is impossible to fill the expan-

sion space inadvertently with the 
rotorcraft in the normal ground atti-
tude. 

(c) 

Filler connections. Each recessed 

oil tank filler connection that can re-
tain any appreciable quantity of oil 
must have a drain that discharges clear 
of the entire rotorcraft. In addition— 

(1) Each oil tank filler cap must pro-

vide an oil-tight seal under the pres-
sure expected in operation; 

(2) For category A rotorcraft, each 

oil tank filler cap or filler cap cover 
must incorporate features that provide 
a warning when caps are not fully 
locked or seated on the filler connec-
tion; and 

(3) Each oil filler must be marked 

under § 29.1557(c)(2). 

(d) 

Vent. Oil tanks must be vented as 

follows: 

(1) Each oil tank must be vented 

from the top part of the expansion 
space to that venting is effective under 
all normal flight conditions. 

(2) Oil tank vents must be arranged 

so that condensed water vapor that 
might freeze and obstruct the line can-
not accumulate at any point; 

(e) 

Outlet.  There must be means to 

prevent entrance into the tank itself, 
or into the tank outlet, of any object 
that might obstruct the flow of oil 
through the system. No oil tank outlet 
may be enclosed by a screen or guard 
that would reduce the flow of oil below 
a safe value at any operating tempera-
ture. There must be a shutoff valve at 
the outlet of each oil tank used with a 
turbine engine unless the external por-
tion of the oil system (including oil 
tank supports) is fireproof. 

(f) 

Flexible liners. Each flexible oil 

tank liner must be approved or shown 

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