788
14 CFR Ch. I (1–1–14 Edition)
§ 29.1015
(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
to be suitable for the particular instal-
lation.
[Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as
amended by Amdt. 29–10, 39 FR 35462, Oct. 1,
1974]
§ 29.1015
Oil tank tests.
Each oil tank must be designed and
installed so that—
(a) It can withstand, without failure,
any vibration, inertia, and fluid loads
to which it may be subjected in oper-
ation; and
(b) It meets the requirements of
§ 29.965, except that instead of the pres-
sure specified in § 29.965(b)—
(1) For pressurized tanks used with a
turbine engine, the test pressure may
not be less than 5 p.s.i. plus the max-
imum operating pressure of the tank;
and
(2) For all other tanks, the test pres-
sure may not be less than 5 p.s.i.
[Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as
amended by Amdt. 29–10, 39 FR 35462, Oct. 1,
1974]
§ 29.1017
Oil lines and fittings.
(a) Each oil line must meet the re-
quirements of § 29.993.
(b) Breather lines must be arranged
so that—
(1) Condensed water vapor that might
freeze and obstruct the line cannot ac-
cumulate at any point;
(2) The breather discharge will not
constitute a fire hazard if foaming oc-
curs, or cause emitted oil to strike the
pilot’s windshield; and
(3) The breather does not discharge
into the engine air induction system.
§ 29.1019
Oil strainer or filter.
(a) Each turbine engine installation
must incorporate an oil strainer or fil-
ter through which all of the engine oil
flows and which meets the following re-
quirements:
(1) Each oil strainer or filter that has
a bypass must be constructed and in-
stalled so that oil will flow at the nor-
mal rate through the rest of the sys-
tem with the strainer or filter com-
pletely blocked.
(2) The oil strainer or filter must
have the capacity (with respect to op-
erating limitations established for the
engine) to ensure that engine oil sys-
tem functioning is not impaired when
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