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14 CFR Ch. I (1–1–24 Edition) 

§ 33.51 

runs at other power must be made at 
8,000 feet altitude pressure; 

(iii) The entire run specified in para-

graph (d)(4) of this section must be 
made at 8,000 feet altitude pressure; 

(iv) The portion of the runs specified 

in paragraph (d)(5) of this section at 80 
percent of rated maximum continuous 
power must be made at 8,000 feet alti-
tude pressure and the portions of the 
runs at other power must be made at 
critical altitude pressure; 

(v) The entire run specified in para-

graph (d)(6) of this section must be 
made at critical altitude pressure; and 

(vi) The turbosupercharger used dur-

ing the endurance test must be run on 
the bench for 50 hours at the limiting 
turbine wheel inlet gas temperature 
and rotational speed for rated max-
imum continuous power operation un-
less the limiting temperature and 
speed are maintained during 50 hours of 
the rated maximum continuous power 
operation. 

[Amdt. 33–3, 32 FR 3736, Mar. 4, 1967, as 
amended by Amdt. 33–6, 39 FR 35465, Oct. 1, 
1974; Amdt. 33–10, 49 FR 6851, Feb. 23, 1984] 

§ 33.51

Operation test. 

The operation test must include the 

testing found necessary by the Admin-
istrator to demonstrate backfire char-
acteristics, starting, idling, accelera-
tion, overspeeding, functioning of pro-
peller and ignition, and any other oper-
ational characteristic of the engine. If 
the engine incorporates a multispeed 
supercharger drive, the design and con-
struction must allow the supercharger 
to be shifted from operation at the 
lower speed ratio to the higher and the 
power appropriate to the manifold 
pressure and speed settings for rated 
maximum continuous power at the 
higher supercharger speed ratio must 
be obtainable within five seconds. 

[Doc. No. 3025, 29 FR 7453, June 10, 1964, as 
amended by Amdt. 33–3, 32 FR 3737, Mar. 4, 
1967] 

§ 33.53

Engine system and component 

tests. 

(a) For those systems and compo-

nents that cannot be adequately sub-
stantiated in accordance with endur-
ance testing of § 33.49, the applicant 
must conduct additional tests to dem-
onstrate that systems or components 

are able to perform the intended func-
tions in all declared environmental and 
operating conditions. 

(b) Temperature limits must be es-

tablished for each component that re-
quires temperature controlling provi-
sions in the aircraft installation to as-
sure satisfactory functioning, reli-
ability, and durability. 

[Doc. No. 3025, 29 FR 7453, June 10, 1964, as 
amended by Amdt. 33–26, 73 FR 48285, Aug. 19, 
2008] 

§ 33.55

Teardown inspection. 

After completing the endurance 

test— 

(a) Each engine must be completely 

disassembled; 

(b) Each component having an ad-

justment setting and a functioning 
characteristic that can be established 
independent of installation on the en-
gine must retain each setting and func-
tioning characteristic within the limits 
that were established and recorded at 
the beginning of the test; and 

(c) Each engine component must con-

form to the type design and be eligible 
for incorporation into an engine for 
continued operation, in accordance 
with information submitted in compli-
ance with § 33.4. 

[Amdt. 33–6, 39 FR 35466, Oct. 1, 1974, as 
amended by Amdt. 33–9, 45 FR 60181, Sept. 11, 
1980] 

§ 33.57

General conduct of block tests. 

(a) The applicant may, in conducting 

the block tests, use separate engines of 
identical design and construction in 
the vibration, calibration, detonation, 
endurance, and operation tests, except 
that, if a separate engine is used for 
the endurance test it must be subjected 
to a calibration check before starting 
the endurance test. 

(b) The applicant may service and 

make minor repairs to the engine dur-
ing the block tests in accordance with 
the service and maintenance instruc-
tions submitted in compliance with 
§ 33.4. If the frequency of the service is 
excessive, or the number of stops due 
to engine malfunction is excessive, or a 
major repair, or replacement of a part 
is found necessary during the block 
tests or as the result of findings from 
the teardown inspection, the engine or 

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