Code of Federal Regulations - Title 14

795

Federal Aviation Administration, DOT

§ 29.1143

§ 29.1123

Exhaust piping.

(a) Exhaust piping must be heat and

corrosion resistant, and must have pro-
visions to prevent failure due to expan-
sion by operating temperatures.

(b) Exhaust piping must be supported

to withstand any vibration and inertia
loads to which it would be subjected in
operation.

ponents between which relative motion
could exist must have provisions for
flexibility.

§ 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 sub-
jected in operation. In addition—

(1) Each exchanger must be suitable

for continued operation at high tem-
peratures and resistant to corrosion
from exhaust gases;

(2) There must be means for inspect-

ing the critical parts of each ex-
changer;

(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 prob-
ability of ignition of flammable fluids
or vapors that might be present in case
of the failure or malfunction of compo-
nents 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 ex-
haust gas heat exchanger and the ven-
tilating air system; or

(2) Other means must be used to pre-

vent 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]

OWERPLANT

ONTROLS AND

CCESSORIES

§ 29.1141

Powerplant controls: general.

(a) Powerplant controls must be lo-

cated and arranged under § 29.777 and
marked under § 29.1555.

(b) Each control must be located so

that it cannot be inadvertently oper-
ated by persons entering, leaving, or
moving normally in the cockpit.

must be approved.

(d) Each control must be able to

maintain any set position without—

(1) Constant attention; or
(2) Tendency to creep due to control

loads or vibration.

(e) Each control must be able to

withstand operating loads without ex-
cessive deflection.

(f) Controls of powerplant valves re-

quired for safety must have—

(1) For manual valves, positive stops

or in the case of fuel valves suitable
index provisions, in the open and closed
position; and

(2) For power-assisted valves, a

means to indicate to the flight crew
when the valve—

(i) Is in the fully open or fully closed

position; or

(ii) Is moving between the fully open

and fully closed position.

(Secs. 313(a), 601, and 603, 72 Stat. 752, 775, 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. 29–13, 42 FR 15046, Mar. 17,
1977; Amdt. 29–26, 53 FR 34219, Sept. 2, 1988]

§ 29.1142

Auxiliary power unit con-

trols.

Means must be provided on the flight

deck for starting, stopping, and emer-
gency shutdown of each installed auxil-
iary power unit.

(Secs. 313(a), 601, 603, 604, Federal Aviation
Act of 1958 (49 U.S.C. 1354(a), 1421, 1423, 1424),
sec. 6(c), Dept. of Transportation Act (49
U.S.C. 1655(c)))

[Amdt. 29–17, 43 FR 50602, Oct. 30, 1978]

§ 29.1143

Engine controls.

(a) There must be a separate power

control for each engine.

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