Voglio sapere a riguardo di…

53530

Federal Register / Vol. 86, No. 184 / Monday, September 27, 2021 / Rules and Regulations
lotter on DSK11XQN23PROD with RULES3

Special Condition No. 32, General Conduct of Tests The FAA proposed that Special Condition no. 32 would require magniX
to 1 include scheduled maintenance in the engine ICA before certification; 2
include any maintenance, in addition to the scheduled maintenance, that was needed during the test to satisfy the requirement; and 3 conduct additional tests that the Administrator finds necessary, warranted by the test results.
The term excessive, as it is used in proposed Special Condition nos.
32b1 and 2, describes the frequency of unplanned engine maintenance and the frequency of unplanned test stoppages that are needed to address engine issues that prevent the engine from completing the tests. Deciding if unplanned maintenance or test stoppages are excessive requires an objective assessment of the reasons for the test interruptions. For example, magniX may not be able to simulate a realistic engine operating environment and may need to integrate test-enabling equipment to achieve the test goals. The test facility equipment may fail or cause an engine to fail during a test. Therefore, unplanned maintenance might not affect the certification test results, but if the FAA considers the maintenance or test stoppages to be excessive, additional testing or unforeseen ICA may be required to comply with the certification requirements.
Comment Summary: Rolls-Royce stated that it supports the clarifications in Special Condition no. 32b with the understanding that the term excessive in Special Condition nos. 32b1 and 32b2 allows for the rectification of some failures while the test continues.
Rolls-Royce suggested that aircraft engines that operate using aviation fuel, operating at the extreme physical conditions required by the endurance tests, sometimes suffer a failure that is unrelated to the test conditions. The ability to review the failure with the FAA, rectify the failure, and continue the test is an important aspect of conducting these tests.
FAA Response: The FAAs assessment of whether unplanned service and maintenance during testing are excessive could include a variety of factors, such as the causes of the stoppage, the effects of test facility equipment, difficulties in simulating a realistic engine operating environment, and whether the engine requires modifications to complete the test. The applicant could also show that unplanned maintenance did not affect the certification test results. The FAA

VerDate Sep<11>2014

19:16 Sep 24, 2021

Jkt 253001

did not change this special condition as a result of this comment.
Comment Summary: TCCA
commented that these special conditions do not address the emerging issue of single event effects, which the FAA is currently addressing via issue papers. TCCA recommended incorporating those issue papers into the special condition.
FAA Response: The FAA does not agree with the comment. The issue paper that TCCA referenced is applicable to engines that operate at high altitudes and high latitudes.
Special Condition nos. 10 and 17
require magniX to account for the intended aircraft application. If magniX
engines can operate at high altitudes and high latitudes, they could apply the referenced issue paper to the certification program. The FAA made no changes to these special conditions as a result of this comment.
Comment Summary: TCCA
recommended that the FAA clarify the requirement in Special Condition no.
32a by including a reference to 14 CFR
33.4, Instructions for continued airworthiness.
FAA Response: The FAA has modified the special condition to add the requested reference to 33.4 to clarify that magniX must provide the service and maintenance instructions in accordance with the ICA.
Applicability As discussed above, these special conditions are applicable to the magniX
magni350 and magni650 Model engines.
Should magniX apply at a later date for a change to the type certificate to include another model on the same type certificate incorporating the same novel or unusual design feature, these special conditions would apply to that model as well.
Conclusion This action affects only magniX
magni350 and magni650 model engines.
It is not a rule of general applicability.
List of Subjects in 14 CFR Part 33
Aircraft, Aviation safety, Reporting and recordkeeping requirements.
Authority Citation The authority citation for these special conditions is as follows:
Authority: 49 U.S.C. 106f, 106g, 40113, 44701, 44702, 44704.

The Special Conditions Accordingly, pursuant to the authority delegated to me by the Administrator, the following special conditions are issued as part of the type
PO 00000

Frm 00024

Fmt 4701

Sfmt 4700

certification basis for magniX USA, Inc., magniX, magni350 and magni650
model engines. The applicant must also comply with the certification procedures set forth in title 14, Code of Federal Regulations 14 CFR part 21.
1. Applicability Unless otherwise noted in these special conditions, the design must comply with the airworthiness standards for aircraft engines set forth in 14 CFR part 33, except those airworthiness standards specifically and explicitly applicable only to reciprocating and turbine aircraft engines.
2. Engine Ratings and Operating Limits In addition to 33.7a, the design must comply with the following:
Ratings and operating limits must be established and included in the type certificate data sheet based on:
a Shaft power, torque, rotational speed, and temperature for:
1 Rated takeoff power;
2 Rated maximum continuous power; and 3 Rated maximum temporary power and associated time limit.
b Duty Cycle and the rating at that duty cycle. The duty cycle must be declared in the engine type certificate data sheet.
c Cooling fluid grade or specification.
d Power-supply requirements.
e Any other ratings or limitations that are necessary for the safe operation of the engine.
3. Materials The engine design must comply with 14 CFR 33.15.
4. Fire Protection The engine design must comply with 14 CFR 33.17.
In addition, high-voltage electrical wiring interconnect systems must be protected against arc faults. Any nonprotected electrical wiring interconnects must be analyzed to show that arc faults do not cause a hazardous engine effect.
5. Durability The engine design and construction must minimize the development of an unsafe condition of the engine between maintenance intervals, overhaul periods, or mandatory actions described in the applicable Instructions for Continued Airworthiness ICA.
6. Engine Cooling The engine design and construction must comply with 33.21. In addition, if cooling is required to satisfy the safety
E:FRFM27SER3.SGM

27SER3