Section 29.1123

14 CFR Ch. I (1-1-19 Edition)

(a) Each exhaust system must ensure
safe disposal of exhaust gases without
fire hazard or carbon monoxide contamination in any personnel compartment.
(b) Each exhaust system part with a
surface hot enough to ignite flammable
fluids or vapors must be located or
shielded so that leakage from any system carrying flammable fluids or vapors will not result in a fire caused by
impingement of the fluids or vapors on
any part of the exhaust system including shields for the exhaust system.
(c) Each component upon which hot
exhaust gases could impinge, or that
could be subjected to high temperatures from exhaust system parts, must
be fireproof. Each exhaust system component must be separated by a fireproof shield from adjacent parts of the
rotorcraft that are outside the engine
and auxiliary power unit compartments.
(d) No exhaust gases may discharge
so as to cause a fire hazard with respect to any flammable fluid vent or
drain.
(e) No exhaust gases may discharge
where they will cause a glare seriously
affecting pilot vision at night.
(f) Each exhaust system component
must be ventilated to prevent points of
excessively high temperature.
(g) Each exhaust shroud must be ventilated or insulated to avoid, during
normal operation, a temperature high
enough to ignite any flammable fluids
or vapors outside the shroud.
(h) If significant traps exist, each
turbine engine exhaust system must
have drains discharging clear of the
rotorcraft, in any normal ground and
flight attitudes, to prevent fuel accumulation after the failure of an attempted engine start.

(b) Exhaust piping must be supported
to withstand any vibration and inertia
loads to which it would be subjected in
operation.
(c) Exhaust piping connected to components between which relative motion
could exist must have provisions for
flexibility.
Section 29.1125 Exhaust heat exchangers.
For reciprocating engine powered
rotorcraft the following apply:
(a) Each exhaust heat exchanger
must be constructed and installed to
withstand the vibration, inertia, and
other loads to which it would be subjected in operation. In addition - 
(1) Each exchanger must be suitable
for continued operation at high temperatures and resistant to corrosion
from exhaust gases;
(2) There must be means for inspecting the critical parts of each exchanger;
(3) Each exchanger must have cooling
provisions wherever it is subject to
contact with exhaust gases; and
(4) No exhaust heat exchanger or
muff may have stagnant areas or liquid
traps that would increase the probability of ignition of flammable fluids
or vapors that might be present in case
of the failure or malfunction of components carrying flammable fluids.
(b) If an exhaust heat exchanger is
used for heating ventilating air used by
personnel - 
(1) There must be a secondary heat
exchanger between the primary exhaust gas heat exchanger and the ventilating air system; or
(2) Other means must be used to prevent harmful contamination of the
ventilating air.
[Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as
amended by Amdt. 29-12, 41 FR 55473, Dec. 20,
1976; Amdt. 29-41, 62 FR 46173, Aug. 29, 1997]

(Secs. 313(a), 601, and 603, 72 Stat. 752, 755, 49
U.S.C. 1354(a), 1421, and 1423; sec. 6(c), 49
U.S.C. 1655 (c))
[Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as
amended by Amdt. 29-3, 33 FR 970, Jan. 26,
1968; Amdt. 29-13, 42 FR 15046, Mar. 17, 1977]

spaschal on DSK3GDR082PROD with CFR

Section 29.1123

Exhaust piping.

(a) Exhaust piping must be heat and
corrosion resistant, and must have provisions to prevent failure due to expansion by operating temperatures.

POWERPLANT CONTROLS AND
ACCESSORIES
Section 29.1141 Powerplant controls: general.
(a) Powerplant controls must be located and arranged under Section 29.777 and
marked under Section 29.1555.
(b) Each control must be located so
that it cannot be inadvertently operated by persons entering, leaving, or
moving normally in the cockpit.

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