543 

Federal Aviation Administration, DOT 

§ 27.1143 

any part of the exhaust system includ-
ing shields for the exhaust system; 

(e) Exhaust gases may not impair 

pilot vision at night due to glare; 

(f) If significant traps exist, each tur-

bine engine exhaust system must have 
drains discharging clear of the rotor-
craft, in any normal ground and flight 
attitudes, to prevent fuel accumulation 
after the failure of an attempted en-
gine 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] 

§ 27.1123

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 
operations. 

(c) Exhaust piping connected to com-

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

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

P

OWERPLANT

C

ONTROLS AND

 

A

CCESSORIES

 

§ 27.1141

Powerplant controls: general. 

(a) Powerplant controls must be lo-

cated and arranged under § 27.777 and 
marked under § 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 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. 

(e) For turbine engine powered rotor-

craft, 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. 

(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] 

§ 27.1143

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 en-

gines. 

(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 inad-
vertent 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 automati-
cally activate and control the 30-sec-
ond 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] 

VerDate Sep<11>2014 

09:06 Jun 28, 2024

Jkt 262046

PO 00000

Frm 00553

Fmt 8010

Sfmt 8010

Y:\SGML\262046.XXX

262046

jspears on DSK121TN23PROD with CFR