Source: https://www.federalregister.gov/documents/2006/06/14/E6-9242/special-conditions-thielert-aircraft-engines-gmbh-piper-pa-28-161-cadet-warrior-ii-and-warrior-iii
Timestamp: 2017-11-25 11:54:21
Document Index: 141711519

Matched Legal Cases: ['art 23', '§\u200923', '§\u200921', 'art 23', '§\u200923', '§\u200923', 'art 23', '§\u200921', 'art 21', '§\u200921', 'art 36', '§\u200921', '§\u200923', '§\u200923', '§\u200923', 'art 23', '§\u200923', '§\u200923', '§\u200923', '§\u200923', '§\u200923', '§\u200923', '§\u200923', '§\u200923', '§\u200923', '§\u200923', '§\u200923', '§\u200923', '§\u200923', '§\u200923', '§\u200923', '§\u200923', '§\u200923', '§\u200923', '§\u200923', 'art 23', '§\u200923']

Federal Register :: Special Conditions: Thielert Aircraft Engines GmbH, Piper PA 28-161 Cadet, Warrior II and Warrior III Series Airplanes; Diesel Cycle Engine Using Turbine (Jet) Fuel
Special Conditions: Thielert Aircraft Engines GmbH, Piper PA 28-161 Cadet, Warrior II and Warrior III Series Airplanes; Diesel Cycle Engine Using Turbine (Jet) Fuel
A Proposed Rule by the Federal Aviation Administration on 06/14/2006
71 FR 34288
34288-34292 (5 pages)
Docket No. CE248
Notice No. 23-06-03-SC
E6-9242
https://www.federalregister.gov/d/E6-9242 https://www.federalregister.gov/d/E6-9242
This notice proposes special conditions for the Piper PA 28-161 Cadet, Warrior II and Warrior III series airplanes. These airplanes, as modified by Thielert Aircraft Engines GmbH, will have a novel or unusual design feature(s) associated with the installation of a diesel cycle engine utilizing turbine (jet) fuel. The applicable airworthiness regulations do not contain adequate or appropriate safety standards for installation of this new technology engine. These proposed special conditions contain the additional safety standards that the Administrator considers necessary to establish a level of safety equivalent to that established by the existing airworthiness standards.
Comments on this proposal may be mailed in duplicate to: Federal Aviation Administration, Regional Counsel, ACE-7, Attention: Rules Docket, Docket No. CE248, 901 Locust, Room 506, Kansas City, Missouri 64106, or delivered in duplicate to the Regional Counsel at the above address. Comments must be marked: CE248. Comments may be inspected in the Rules Docket weekdays, except Federal holidays, between 7:30 a.m. and 4 p.m.
Interested persons are invited to participate in the making of these proposed special conditions by submitting such written data, views, or arguments, as they may desire. Communications should identify the regulatory docket or notice number and be submitted in duplicate to the address specified above. All communications received on or before the closing date for comments will be considered by the Administrator. The proposals described in this notice may be changed in light of the comments received. All comments received will be available in the Rules Docket for examination by interested persons, both before and after the closing date for comments. A report summarizing each substantive public contact with FAA personnel concerning this rulemaking will be filed in the docket. Persons wishing the FAA to acknowledge receipt of their comments submitted in response to this notice must include with those comments a self-addressed, stamped postcard on which the following statement is made: “Comments to CE248.” The postcard will be date stamped and returned to the commenter.
On February 11, 2002, Thielert Aircraft Engines GmbH, of Lichtenstein, Germany applied for a supplemental type certificate to install a diesel cycle engine utilizing turbine (jet) fuel in Piper PA 28-161 Cadet, Warrior II and Warrior III series airplanes. The Piper PA 28-161 Cadet, Warrior II and Warrior III series airplanes, currently approved under Type Certificate No. 2A13, is a four-place, low wing, fixed tricycle landing gear, conventional planform airplane. The Piper PA 28-161 Cadet, Warrior II and Warrior III series airplanes to be modified have gross weights in the range of 2325 to 2440 pounds in the normal category. The affected series of airplanes have been equipped with various gasoline reciprocating engines of 160 horsepower.
Expecting industry to reintroduce diesel engine technology into the small airplane fleet, the FAA issued Policy Statement PS-ACE100-2002-004 on May 15, 2004, which identified areas of technological concern involving introduction of new technology diesel engines into small airplanes. For a more detailed summary of the FAA's development of diesel engine requirements, refer to this policy.
The general areas of concern involved the power characteristics of the diesel engines, the use of turbine fuel in an airplane class that has typically been powered by gasoline fueled engines, the vibration characteristics and failure modes of diesel engines. These concerns were identified after review of the historical record of diesel engine use in aircraft and a review of the 14 CFR part 23 regulations, which identified specific regulatory areas that needed to be evaluated for applicability to diesel engine installations. These concerns are not considered universally applicable to all types of possible diesel engines and diesel engine installations. However, after review of the Thielert installation, the Thielert engine type, and the requirements applied by the Lufthart Bundesamt, and applying the provisions of the diesel policy, the FAA proposed these fuel system and engine related special conditions. Other special conditions issued in a separate notice included special conditions for HIRF and application of § 23.1309 provisions to the Full Authority Digital Engine Control (FADEC).
Under the provisions of § 21.101, Thielert Aircraft Engines GmbH must show that the Piper PA 28-161 Cadet, Warrior II and Warrior III series Start Printed Page 34289airplanes, as changed, continues to meet the applicable provisions of the regulations incorporated by reference in Type Certificate No. 2A13 or the applicable regulations in effect on the date of application for the change. The regulations incorporated by reference in the type certificate are commonly referred to as the “original type certification basis.” The regulations incorporated by reference in Type Certificate No. 2A13 are as follows:
The certification basis of models Piper PA 28-161 Cadet, Warrior II and Warrior III series airplanes is:
Civil Air Regulations (CAR) 3 effective May 15, 1956, including Amendments 3-1 and 3-2; paragraph 3.387(d) of Amendment 3-4; paragraphs 3.304 and 3.705 of Amendment 3-7, effective May 3, 1962; FAR 23.955 and 23.959 as amended by Amendment 23-7, effective September 14, 1969; FAR 23.1557(c)(1) as amended by Amendment 23-18, effective May 2, 1977; FAR 23.1327 and 23.1547 as amended by Amendment 23-20, effective September 1, 1977; and FAR 36, effective December 1, 1969, through Amendment 36-4.
14 CFR part 23, §§ 23.1; 23.3; 23.21; 23.23; 23.25; 23.29; 23.33; 23.45; 23.49; 23.51; 23.53; 23.63; 23.65; 23.69; 23.71; 23.73; 23.77; 23.141; 23.143; 23.145; 23.151; 23.153; 23.155; 23.171; 23.173; 23.175; 23.177; 23.201; 23.221; 23.231; 23.251; 23.301; 23.303; 23.305; 23.307; 23.321; 23.335; 23.337; 23.341; 23.343; 23.361; 23.361(b)(1); 23.361(c)(3); 23.363; 23.371; 23.572; 23.573; 23.574; 23.601; 23.603; 23.605; 23.607; 23.609; 23.611; 23.613; 23.619; 23.621; 23.623; 23.625; 23.627; CAR 3.159; 23.773; 23.777; 23.777(d); 23.779; 23.779(b); 23.781; 23.831; 23.863; 23.865; 23.867; 23.901; 23.901(d)(1); 23.903; 23.905; 23.907; 23.909; 23.925; 23.929; 23.939; 23.943; 23.951; 23.951(c); 23.954; 23.955; 23.959; 23.961; 23.963; 23.965; 23.967; 23.969; 23.971; 23.973; 23.973(f); 23.975; 23.977; 23.977(a)(2) in place of 23.977(a)(1); 23.991; 23.993; 23.994; 23.995; 23.997; 23.999; 23.1011; 23.1013; 23.1015; 23.1017; 23.1019; 23.1021; 23.1023; 23.1041; 23.1043; 23.1047; 23.1061; 23.1063; 23.1091; 23.1093; 23.1103; 23.1107; 23.1121; 23.1123; 23.1141; 23.1143; 23.1145; 23.1163; 23.1165; 23.1181; 23.1182; 23.1183; 23.1191; 23.1193; 23.1301; 23.1305; 23.1305(c)(8); 23.1309; 23.1311; 23.1321; 23.1322; 23.1327; 23.1331; 23.1337; 23.1351; 23.1353; 23.1357; 23.1359; 23.1361; 23.1365; 23.1367; 23.1381; 23.1431; 23.1461; 23.1501; 23.1519; 23.1521; 23.1521(d); 23.1527; 23.1529; 23.1541; 23.1543; 23.1549; 23.1551; 23.1555; 23.1557; 23.1557(c)(1)(ii), in place of §§ 23.1557(c)(i); 23.1567; 23.1581; 23.1583; 23.1585; 23.1587 and 23.1589.
Liquid Cooling—Installation—23.1061
The type certification basis includes exemptions, if any; equivalent level of safety findings, if any; and the special conditions adopted by this rulemaking action.
In addition, if the regulations incorporated by reference do not provide adequate standards with respect to the change, the applicant must comply with certain regulations in effect on the date of application for the change. The type certification basis for the modified airplanes is as stated previously with the following modifications.
If the Administrator finds that the applicable airworthiness regulations (i.e., part 23) do not contain adequate or appropriate safety standards for the Piper PA 28-161 Cadet, Warrior II and Warrior III series airplanes because of a novel or unusual design feature, special conditions are prescribed under the provisions of § 21.16.
In addition to the applicable airworthiness regulations and special conditions, the Piper PA 28-161 Cadet, Warrior II and Warrior III series airplanes must comply with the 14 CFR part 21, § 21.115 noise certification requirements of 14 CFR part 36.
The Piper PA 28-161 Cadet, Warrior II and Warrior III series airplanes will incorporate the following novel or unusual design features:
The Piper PA 28-161 Cadet, Warrior II and Warrior III series airplanes, as modified by Thielert Aircraft Engines GmbH, will incorporate an aircraft diesel engine utilizing turbine (jet) fuel.
As discussed above, these special conditions are applicable to the Piper PA 28-161 Cadet, Warrior II and Warrior III series airplanes. Should Thielert Aircraft Engines GmbH apply at a later date for a supplemental type certificate to modify any other model included on Type Certificate No. 2A13 to incorporate the same novel or unusual design feature, the special conditions would apply to that model as well under the provisions of § 21.101.
The major concerns identified in developing FAA policy deal with installing the diesel engine and its vibration levels under normal operating conditions and with one cylinder inoperative, accommodating turbine fuels in airplane systems that have generally evolved based on gasoline requirements, the anticipated use of a FADEC to control the engine, and the appropriate limitations and indications for a diesel engine powered airplane. The general concerns associated with the Thielert modification are as follows:
Installation and Vibration Requirements.
Fuel and Fuel System Related Requirements.
FADEC and Electrical System Requirements.
Limitations and Indications.
Installation and Vibration Requirements: These special conditions include requirements similar to the requirements of § 23.901(d)(1) for turbine engines. In addition to the requirements of § 23.901 applied to reciprocating engines, the applicant will be required to construct and arrange each diesel engine installation to result in vibration characteristics that do not Start Printed Page 34290exceed those established during the type certification of the engine; and do not exceed vibration characteristics that a previously certificated airframe structure has been approved for, unless such vibration characteristics are shown to have no effect on safety or continued airworthiness. The engine limit torque design requirements as specified in § 23.361 are also modified.
An additional requirement to consider vibration levels and/or effects of an inoperative cylinder was imposed. Also, a requirement to evaluate the engine design for the possibility of, or effect of, liberating high-energy engine fragments, if a catastrophic engine failure occurs, was added.
Section 23.961 will be complied with using the turbine fuel requirements. These requirements will substantiated by flight-testing as described in Advisory Circular AC 23-8B, Flight Test Guide for Certification of Part 23 Airplanes.
To ensure fuel system compatibility and reduce the possibility of misfueling, and discounting the first clause of § 23.973(f) referring to turbine engines, the applicant will comply with § 23.973(f).
Due to the use of turbine fuel, the applicant will comply with § 23.977(a)(2), and § 23.977(a)(1) will not apply. “Turbine engines” will be interpreted to mean “aircraft diesel engine” for this requirement. An additional requirement imposed is to consider the possibility of fuel freezing.
The transition from the actual engine electrical network (FADEC network) to the remaining electrical system with the consumer's, avionics, communication, etcetera, should be made by a single point only. If several transitions (e.g., for redundancy reasons) are needed, then the number of the transitions must be kept as small as possible.
In case of loss of alternator power, the installation must guarantee that the battery will provide the power for an appropriate time after appropriate warning to the pilot.
FADEC, alternator, and battery must be interconnected in an appropriate way, so that in case of loss of battery power, the supply to the FADEC is guaranteed by the alternator.
Limitations and Indications: Section 23.1305, paragraphs (a) and (b)(2), will apply, except that propeller revolutions per minute (RPM) will be displayed. Sections 23.1305, paragraphs (b)(4) and (b)(5), are deleted.
Additional critical engine parameters for this installation that will be displayed include the following:
Accordingly, the Federal Aviation Administration (FAA) proposes the following special conditions as part of the type certification basis for Piper PA 28-161 Cadet, Warrior II and Warrior III series airplanes modified by Thielert Aircraft Engines GmbH.
1. Engine torque (Provisions similar to § 23.361, paragraphs (b)(1) and (c)(3)):
(a) For diesel engine installations, the engine mounts and supporting structure must be designed to withstand the following:
2. Powerplant—Installation (Provisions similar to § 23.901(d)(1) for turbine engines):
3. Powerplant—Fuel System—Fuel system with water saturated fuel (Compliance with § 23.951 requirements):
4. Powerplant—Fuel System—Fuel system hot weather operation (Compliance with § 23.961 requirements):
Each fuel system must be free from vapor lock when using fuel at its critical temperature, with respect to vapor formation, when operating the airplane in all critical operating and environmental conditions for which approval is requested. For turbine fuel, Start Printed Page 34291or for aircraft equipped with diesel cycle engines that use turbine or diesel type fuels, the initial temperature must be 110 °F, -0°, +5° or the maximum outside air temperature for which approval is requested, whichever is more critical.
5. Powerplant—Fuel system—Fuel tank filler connection (Compliance with § 23.973(f) requirements):
In place of compliance with § 23.973(e) and (f), the applicant must comply with the following:
6. Powerplant—Fuel system—Fuel tank outlet (Compliance with § 23.977 requirements):
In place of compliance with § 23.977(a)(1) the applicant will comply with § 23.977(a)(2), except “diesel” replaces “turbine.”
7. Powerplant—Powerplant Controls and Accessories—Engine ignition systems (Compliance with § 23.1165 requirements):
(a) In case of failure of one power supply of the electrical system, there will be no significant engine power change. The electrical power supply to the FADEC must remain stable in such a failure.
(d) In case of loss of alternator power, the installation must guarantee that the battery will provide the power for an appropriate time after appropriate warning to the pilot. This period must be at least 120 minutes.
(e) FADEC, alternator and battery must be interconnected in an appropriate way, so that in case of loss of battery power, the supply to the FADEC is guaranteed by the alternator.
8. Equipment—General—Powerplant Instruments (Compliance with § 23.1305 requirements):
In place of compliance with § 23.1305, the applicant will comply with the following:
(e) A coolant temperature indicator.
Alternately, no indicator is required if the engine can operate normally for a specified period with the fuel strainer exposed to the maximum fuel contamination as specified in MIL-5007D and provisions for replacing the fuel filter at this specified period (or a shorter period) are included in the maintenance schedule for the engine installation.
9. Operating Limitations and Information—Powerplant limitations—Fuel grade or designation (Compliance with § 23.1521(d) requirements):
10. Markings And Placards—Miscellaneous markings and placards—Fuel, oil, and coolant filler openings (Compliance with § 23.1557(c)(1) requirements):
Instead of compliance with § 23.1557(c)(1)(i), the applicant must comply with the following:
11. Powerplant—Fuel system—Fuel-Freezing:
12. Powerplant Installation—Vibration levels:
(2) Any vibration level that is higher than that imposed on the airframe by the replaced gasoline engine must be considered in the modification and the effects on the technical areas covered by the following paragraphs must be investigated: 14 CFR part 23, §§ 23.251; 23.613; 23.627; CAR 3.159; 23.572; 23.573; 23.574 and 23.901.
13. Powerplant Installation—One cylinder inoperative:
It must be shown by test or analysis, or by a combination of methods, that the Start Printed Page 34292airframe can withstand the shaking or vibratory forces imposed by the engine if a cylinder becomes inoperative. Diesel engines of conventional design typically have extremely high levels of vibration when a cylinder becomes inoperative. Data must be provided to the airframe installer/modifier so either appropriate design considerations or operating procedures, or both, can be developed to prevent airframe and propeller damage.
14. Powerplant Installation—High Energy Engine Fragments:
It may be possible for diesel engine cylinders (or portions thereof) to fail and physically separate from the engine at high velocity (due to the high internal pressures). This failure mode will be considered possible in engine designs with removable cylinders or other non-integral block designs. The following is required:
(1) It must be shown that the engine construction type (massive or integral block with non-removable cylinders) is inherently resistant to liberating high energy fragments in the event of a catastrophic engine failure; or,
Issued in Kansas City, Missouri on June 7, 2006.
[FR Doc. E6-9242 Filed 6-13-06; 8:45 am]