Section 27.1123

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

any part of the exhaust system including shields for the exhaust system;
(e) Exhaust gases may not impair
pilot vision at night due to glare;
(f) 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;
(g) Each exhaust heat exchanger
must incorporate means to prevent
blockage of the exhaust port after any
internal heat exchanger failure.
(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. 5074, 29 FR 15695, Nov. 24, 1964, as
amended by Amdt. 27-12, 42 FR 15045, Mar. 17,
1977]

Section 27.1123

[Amdt. 27-11, 41 FR 55470, Dec. 20, 1976]

POWERPLANT CONTROLS AND
ACCESSORIES

spaschal on DSK3GDR082PROD with CFR

(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. 5074, 29 FR 15695, Nov. 24, 1964, as
amended by Amdt. 27-12, 42 FR 15045, Mar. 17,
1977; Amdt. 27-23, 53 FR 34214, Sept. 2, 1988;
Amdt. 27-33, 61 FR 21907, May 10, 1996]

Section 27.1143

Exhaust piping.

(a) Exhaust piping must be heat and
corrosion resistant, and must have provisions to prevent failure due to expansion by operating temperatures.
(b) Exhaust piping must be supported
to withstand any vibration and inertia
loads to which it would be subjected in
operations.
(c) Exhaust piping connected to components between which relative motion
could exist must have provisions for
flexibility.

Section 27.1141

(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.
(e) For turbine engine powered rotorcraft, no single failure or malfunction,
or probable combination thereof, in
any powerplant control system may
cause the failure of any powerplant
function necessary for safety.

Powerplant controls: general.

(a) Powerplant controls must be located and arranged under Section 27.777 and
marked under Section 27.1555.
(b) Each flexible powerplant control
must be approved.
(c) 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.
(d) Controls of powerplant valves required 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

Engine controls.

(a) There must be a separate power
control for each engine.
(b) Power controls must be grouped
and arranged to allow - 
(1) Separate control of each engine;
and
(2) Simultaneous control of all engines.
(c) Each power control must provide
a positive and immediately responsive
means of controlling its engine.
(d) If a power control incorporates a
fuel shutoff feature, the control must
have a means to prevent the inadvertent movement of the control into
the shutoff position. The means must - 
(1) Have a positive lock or stop at the
idle position; and
(2) Require a separate and distinct
operation to place the control in the
shutoff position.
(e) For rotorcraft to be certificated
for a 30-second OEI power rating, a
means must be provided to automatically activate and control the 30-second OEI power and prevent any engine
from exceeding the installed engine
limits associated with the 30-second
OEI power rating approved for the
rotorcraft.
[Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as
amended by Amdt. 27-11, 41 FR 55470, Dec. 20,
1976; Amdt. 27-23, 53 FR 34214, Sept. 2, 1988;
Amdt. 27-29, 59 FR 47767, Sept. 16, 1994]

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