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14 CFR Ch. I (1–1–14 Edition)
§ 29.1431
M
ISCELLANEOUS
E
QUIPMENT
§ 29.1431
Electronic equipment.
(a) Radio communication and naviga-
tion equipment installations must be
free from hazards in themselves, in
their method of operation, and in their
effects on other components, under any
critical environmental conditions.
(b) Radio communication and naviga-
tion equipment, controls, and wiring
must be installed so that operation of
any one unit or system of units will
not adversely affect the simultaneous
operation of any other radio or elec-
tronic unit, or system of units, re-
quired by this chapter.
§ 29.1433
Vacuum systems.
(a) There must be means, in addition
to the normal pressure relief, to auto-
matically relieve the pressure in the
discharge lines from the vacuum air
pump when the delivery temperature of
the air becomes unsafe.
(b) Each vacuum air system line and
fitting on the discharge side of the
pump that might contain flammable
vapors or fluids must meet the require-
ments of § 29.1183 if they are in a des-
ignated fire zone.
(c) Other vacuum air system compo-
nents in designated fire zones must be
at least fire resistant.
§ 29.1435
Hydraulic systems.
(a)
Design. Each hydraulic system
must be designed as follows:
(1) Each element of the hydraulic
system must be designed to withstand,
without detrimental, permanent defor-
mation, any structural loads that may
be imposed simultaneously with the
maximum operating hydraulic loads.
(2) Each element of the hydraulic
system must be designed to withstand
pressures sufficiently greater than
those prescribed in paragraph (b) of
this section to show that the system
will not rupture under service condi-
tions.
(3) There must be means to indicate
the pressure in each main hydraulic
power system.
(4) There must be means to ensure
that no pressure in any part of the sys-
tem will exceed a safe limit above the
maximum operating pressure of the
system, and to prevent excessive pres-
sures resulting from any fluid volu-
metric change in lines likely to remain
closed long enough for such a change to
take place. The possibility of detri-
mental transient (surge) pressures dur-
ing operation must be considered.
(5) Each hydraulic line, fitting, and
component must be installed and sup-
ported to prevent excessive vibration
and to withstand inertia loads. Each
element of the installation must be
protected from abrasion, corrosion, and
mechanical damage.
(6) Means for providing flexibility
must be used to connect points, in a
hydraulic fluid line, between which rel-
ative motion or differential vibration
exists.
(b)
Tests. Each element of the system
must be tested to a proof pressure of 1.5
times the maximum pressure to which
that element will be subjected in nor-
mal operation, without failure, mal-
function, or detrimental deformation
of any part of the system.
(c)
Fire protection. Each hydraulic
system using flammable hydraulic
fluid must meet the applicable require-
ments of §§ 29.861, 29.1183, 29.1185, and
29.1189.
§ 29.1439
Protective breathing equip-
ment.
(a) If one or more cargo or baggage
compartments are to be accessible in
flight, protective breathing equipment
must be available for an appropriate
crewmember.
(b) For protective breathing equip-
ment required by paragraph (a) of this
section or by any operating rule of this
chapter—
(1) That equipment must be designed
to protect the crew from smoke, carbon
dioxide, and other harmful gases while
on flight deck duty;
(2) That equipment must include—
(i) Masks covering the eyes, nose, and
mouth; or
(ii) Masks covering the nose and
mouth, plus accessory equipment to
protect the eyes; and
(3) That equipment must supply pro-
tective oxygen of 10 minutes duration
per crewmember at a pressure altitude
of 8,000 feet with a respiratory minute
volume of 30 liters per minute BTPD.
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