673 

Federal Aviation Administration, DOT 

§ 29.1522 

(4) The maximum allowable oil tem-

perature. 

(g) 

Thirty-minute OEI power operation. 

Unless otherwise authorized, the use of 
30-minute OEI power must be limited 
to multiengine, turbine-powered rotor-
craft for not longer than 30 minutes 
after failure of an engine. The use of 30- 
minute OEI power must also be limited 
by— 

(1) The maximum rotational speed, 

which may not be greater than— 

(i) The maximum value determined 

by the rotor design; or 

(ii) The maximum value shown dur-

ing the type tests; 

(2) The maximum allowable gas tem-

perature; 

(3) The maximum allowable torque; 

and 

(4) The maximum allowable oil tem-

perature. 

(h) 

Continuous OEI power operation. 

Unless otherwise authorized, the use of 
continuous OEI power must be limited 
to multiengine, turbine-powered rotor-
craft for continued flight after failure 
of an engine. The use of continuous 
OEI power must also be limited by— 

(1) The maximum rotational speed, 

which may not be greater than— 

(i) The maximum value determined 

by the rotor design; or 

(ii) The maximum value shown dur-

ing the type tests. 

(2) The maximum allowable gas tem-

perature; 

(3) The maximum allowable torque; 

and 

(4) The maximum allowable oil tem-

perature. 

(i) 

Rated 30-second OEI power oper-

ation. 

Rated 30-second OEI power is 

permitted only on multiengine, tur-
bine-powered rotorcraft, also certifi-
cated for the use of rated 2-minute OEI 
power, and can only be used for contin-
ued operation of the remaining en-
gine(s) after a failure or precautionary 
shutdown of an engine. It must be 
shown that following application of 30- 
second OEI power, any damage will be 
readily detectable by the applicable in-
spections and other related procedures 
furnished in accordance with Section 
A29.4 of appendix A of this part and 
Section A33.4 of appendix A of part 33. 
The use of 30-second OEI power must be 
limited to not more than 30 seconds for 

any period in which that power is used, 
and by— 

(1) The maximum rotational speed 

which may not be greater than— 

(i) The maximum value determined 

by the rotor design; or 

(ii) The maximum value dem-

onstrated during the type tests; 

(2) The maximum allowable gas tem-

perature; and 

(3) The maximum allowable torque. 
(j) 

Rated 2-minute OEI power oper-

ation. 

Rated 2-minute OEI power is per-

mitted only on multiengine, turbine- 
powered rotorcraft, also certificated 
for the use of rated 30-second OEI 
power, and can only be used for contin-
ued operation of the remaining en-
gine(s) after a failure or precautionary 
shutdown of an engine. It must be 
shown that following application of 2- 
minute OEI power, any damage will be 
readily detectable by the applicable in-
spections and other related procedures 
furnished in accordance with Section 
A29.4 of appendix a of this part and 
Section A33.4 of appendix A of part 33. 
The use of 2-minute OEI power must be 
limited to not more than 2 minutes for 
any period in which that power is used, 
and by— 

(1) The maximum rotational speed, 

which may not be greater than— 

(i) The maximum value determined 

by the rotor design; or 

(ii) The maximum value dem-

onstrated during the type tests; 

(2) The maximum allowable gas tem-

perature; and 

(3) The maximum allowable torque. 

(Secs. 313(a), 601, 603, 604, and 605 of the Fed-
eral Aviation Act of 1958 (49 U.S.C. 1354(a), 
1421, 1423, 1424, and 1425); and sec. 6(c), Dept. 
of Transportation Act (49 U.S.C. 1655(c))) 

[Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as 
amended by Amdt. 29–1, 30 FR 8778, July 13, 
1965; Amdt. 29–3, 33 FR 971, Jan. 26, 1968; 
Amdt. 29–15, 43 FR 2327, Jan. 16, 1978; Amdt. 
29–26, 53 FR 34220, Sept. 2, 1988; Amdt. 29–34, 
59 FR 47768, Sept. 16, 1994; Amdt. 29–41, 62 FR 
46173, Aug. 29, 1997] 

§ 29.1522

Auxiliary power unit limita-

tions. 

If an auxiliary power unit that meets 

the requirements of TSO-C77 is in-
stalled in the rotorcraft, the limita-
tions established for that auxiliary 
power unit under the TSO including 
the categories of operation must be 

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