710 

14 CFR Ch. I (1–1–19 Edition) 

§ 33.49 

(2) A 20-hour run consisting of alter-

nate periods of 1

1

⁄

2

hours at rated max-

imum continuous power with max-
imum continuous speed, and 

1

⁄

2

hour at 

75 percent rated maximum continuous 
power and 91 percent maximum contin-
uous speed. 

(3) A 20-hour run consisting of alter-

nate periods of 1

1

⁄

2

hours at rated max-

imum continuous power with max-
imum continuous speed, and 

1

⁄

2

hour at 

70 percent rated maximum continuous 
power and 89 percent maximum contin-
uous speed. 

(4) A 20-hour run consisting of alter-

nate periods of 1

1

⁄

2

hours at rated max-

imum continuous power with max-
imum continuous speed, and 

1

⁄

2

hour at 

65 percent rated maximum continuous 
power and 87 percent maximum contin-
uous speed. 

(5) A 20-hour run consisting of alter-

nate periods of 1

1

⁄

2

hours at rated max-

imum continuous power with max-
imum continuous speed, and 

1

⁄

2

hour at 

60 percent rated maximum continuous 
power and 84.5 percent maximum con-
tinuous speed. 

(6) A 20-hour run consisting of alter-

nate periods of 1

1

⁄

2

hours at rated max-

imum continuous power with max-
imum continuous speed, and 

1

⁄

2

hour at 

50 percent rated maximum continuous 
power and 79.5 percent maximum con-
tinuous speed. 

(7) A 20-hour run consisting of alter-

nate periods of 2

1

⁄

2

hours at rated max-

imum continuous power with max-
imum continuous speed, and 2

1

⁄

2

hours 

at maximum best economy cruising 
power or at maximum recommended 
cruising power. 

(c) 

Engines incorporating a gear-driven 

two-speed supercharger. 

For engines in-

corporating a gear-driven two-speed su-
percharger the applicant must conduct 
the following runs: 

(1) A 30-hour run consisting of alter-

nate periods in the lower gear ratio of 
5 minutes at rated takeoff power with 
takeoff speed, and 5 minutes at max-
imum best economy cruising power or 
at maximum recommended cruising 
power. If a takeoff power rating is de-
sired in the higher gear ratio, 15 hours 
of the 30-hour run must be made in the 
higher gear ratio in alternate periods 
of 5 minutes at the observed horse-
power obtainable with the takeoff crit-

ical altitude manifold pressure and 
takeoff speed, and 5 minutes at 70 per-
cent high ratio rated maximum contin-
uous power and 89 percent high ratio 
maximum continuous speed. 

(2) A 15-hour run consisting of alter-

nate periods in the lower gear ratio of 
1 hour at rated maximum continuous 
power with maximum continuous 
speed, and 

1

⁄

2

hour at 75 percent rated 

maximum continuous power and 91 per-
cent maximum continuous speed. 

(3) A 15-hour run consisting of alter-

nate periods in the lower gear ratio of 
1 hour at rated maximum continuous 
power with maximum continuous 
speed, and 

1

⁄

2

hour at 70 percent rated 

maximum continuous power and 89 per-
cent maximum continuous speed. 

(4) A 30-hour run in the higher gear 

ratio at rated maximum continuous 
power with maximum continuous 
speed. 

(5) A 5-hour run consisting of alter-

nate periods of 5 minutes in each of the 
supercharger gear ratios. The first 5 
minutes of the test must be made at 
maximum continuous speed in the 
higher gear ratio and the observed 
horsepower obtainable with 90 percent 
of maximum continuous manifold pres-
sure in the higher gear ratio under sea 
level conditions. The condition for op-
eration for the alternate 5 minutes in 
the lower gear ratio must be that ob-
tained by shifting to the lower gear 
ratio at constant speed. 

(6) A 10-hour run consisting of alter-

nate periods in the lower gear ratio of 
1 hour at rated maximum continuous 
power with maximum continuous 
speed, and 1 hour at 65 percent rated 
maximum continuous power and 87 per-
cent maximum continuous speed. 

(7) A 10-hour run consisting of alter-

nate periods in the lower gear ratio of 
1 hour at rated maximum continuous 
power with maximum continuous 
speed, and 1 hour at 60 percent rated 
maximum continuous power and 84.5 
percent maximum continuous speed. 

(8) A 10-hour run consisting of alter-

nate periods in the lower gear ratio of 
1 hour at rated maximum continuous 
power with maximum continuous 
speed, and 1 hour at 50 percent rated 
maximum continuous power and 79.5 
percent maximum continuous speed. 

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