647 

Federal Aviation Administration, DOT 

§ 29.1147 

(c) Each flexible powerplant control 

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. 

(b) Power controls must be arranged 

to allow ready synchronization of all 
engines by— 

(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) Each fluid injection control other 

than fuel system control must be in 
the corresponding power control. How-

ever, the injection system pump may 
have a separate control. 

(e) 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. 

(f) 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. 

[Amdt. 29–26, 53 FR 34219, Sept. 2, 1988, as 
amended by Amdt. 29–34, 59 FR 47768, Sept. 
16, 1994] 

§ 29.1145

Ignition switches. 

(a) Ignition switches must control 

each ignition circuit on each engine. 

(b) There must be means to quickly 

shut off all ignition by the grouping of 
switches or by a master ignition con-
trol. 

(c) Each group of ignition switches, 

except ignition switches for turbine en-
gines for which continuous ignition is 
not required, and each master ignition 
control must have a means to prevent 
its inadvertent operation. 

(Secs. 313(a), 601, and 603, 72 Stat. 759, 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] 

§ 29.1147

Mixture controls. 

(a) If there are mixture controls, 

each engine must have a separate con-
trol, and the controls must be arranged 
to allow— 

(1) Separate control of each engine; 

and 

(2) Simultaneous control of all en-

gines. 

(b) Each intermediate position of the 

mixture controls that corresponds to a 
normal operating setting must be iden-
tifiable by feel and sight. 

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