Special Conditions: Cirrus Aircraft Corporation, SF50; Auto Throttle, 76379-76381 [2015-31058]

Download as PDF Federal Register / Vol. 80, No. 236 / Wednesday, December 9, 2015 / Rules and Regulations fewer losses on an aggregate basis than Class A interests, the Class B interests would not qualify as common equity tier 1 capital. However, where the membership interests provide for disproportionate allocation of profits, such as described in the example in paragraph (c)(4) of this section, and the reallocation of prior distributions would be limited to reversing the disproportionate portions of prior distributions, both the Class A and Class B interests could qualify as common equity tier 1 capital provided that they met all the other criteria in § 217.20(b). § 217.502 Application of the Board’s Regulatory Capital Framework to Employee Stock Ownership Plans that are Depository Institution Holding Companies and Certain Trusts that are Savings and Loan Holding Companies. (a) Employee Stock Ownership Plans. Notwithstanding § 217.1(c), a bank holding company or covered savings and loan holding company that is an employee stock ownership plan is exempt from this part until the Board adopts regulations that directly relate to the application of capital regulations to employee stock ownership plans. (b) Personal or Family Trusts. Notwithstanding § 217.1(c), a covered savings and loan holding company is exempt from this part if it is a personal or family trust and not a business trust until the Board adopts regulations that apply capital regulations to such a covered savings and loan holding company. By order of the Board of Governors of the Federal Reserve System, December 4, 2015. Robert deV. Frierson, Secretary of the Board. [FR Doc. 2015–31013 Filed 12–8–15; 8:45 am] BILLING CODE P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 23 [Docket No. FAA–2015–3464; Special Conditions No. 23–272–SC] Special Conditions: Cirrus Aircraft Corporation, SF50; Auto Throttle Federal Aviation Administration (FAA), DOT. ACTION: Final special conditions. wgreen on DSK2VPTVN1PROD with RULES AGENCY: These special conditions are issued for the Cirrus Aircraft Corporation Model SF50 airplane. This airplane will have a novel or unusual design feature(s) associated with installation of an Auto Throttle System. SUMMARY: VerDate Sep<11>2014 15:17 Dec 08, 2015 Jkt 238001 The applicable airworthiness regulations do not contain adequate or appropriate safety standards for this design feature. These 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. DATES: The effective date of these special conditions is December 9, 2015 and are applicable on December 2, 2015. FOR FURTHER INFORMATION CONTACT: Jeff Pretz, Regulations and Policy Branch, ACE–111, Federal Aviation Administration, Small Airplane Directorate, Aircraft Certification Service, ACE–111, 901 Locust, Room 301, Kansas City, MO 64106; telephone (816) 329–3239, facsimile (816) 329– 4090. SUPPLEMENTARY INFORMATION: Background On September 9, 2008, Cirrus Aircraft Corporation applied for a type certificate for their new Model SF50. On December 11, 2012 Cirrus elected to adjust the certification basis of the SF50 to include 14 CFR part 23 through amendment 62. The SF50 is a low-wing, 7-seat (5 adults and 2 children), pressurized, retractable gear, carbon composite airplane with one turbofan engine mounted partially in the upper aft fuselage. It is constructed largely of carbon and fiberglass composite materials. Like other Cirrus products, the SF50 includes a ballistically deployed airframe parachute. The SF50 has a maximum operating altitude of 28,000 feet and the maximum takeoff weight will be at or below 6,000 pounds with a range at economy cruise of roughly 1,000 nautical miles. Current part 23 airworthiness regulations do not contain appropriate safety standards for an Auto Throttle System (ATS) installation; therefore, special conditions are required to establish an acceptable level of safety. Part 25 regulations contain appropriate safety standards for these systems, making the intent for this project to apply the language in § 25.1329 for the auto throttle, while substituting § 23.1309 and § 23.143 in place of the similar part 25 regulations referenced in § 25.1329. In addition, malfunction of the ATS to perform its intended function shall be evaluated per the Loss of Thrust Control (LOTC) criteria established under part 33 for electronic engine controls. An analysis must show that no single failure or malfunction or probable combinations of failures of the ATS will permit the LOTC probability PO 00000 Frm 00025 Fmt 4700 Sfmt 4700 76379 to exceed those established under part 33 for an electronic engine control. Type Certification Basis Under the provisions of 14 CFR 21.17, Cirrus must show that the Model SF50 meets the applicable provisions of part 23, as amended by amendments 23–1 through 23–62 thereto. If the Administrator finds that the applicable airworthiness regulations (i.e., 14 CFR part 23) do not contain adequate or appropriate safety standards for the SF50 because of a novel or unusual design feature, special conditions are prescribed under the provisions of § 21.16. Special conditions are initially applicable to the model for which they are issued. Should the type certificate for that model be amended later to include any other model that incorporates the same or similar novel or unusual design feature, the special conditions would also apply to the other model under § 21.101. In addition to the applicable airworthiness regulations and special conditions, the SF50 must comply with the fuel vent and exhaust emission requirements of 14 CFR part 34 and the noise certification requirements of 14 CFR part 36 and the FAA must issue a finding of regulatory adequacy under section 611 of Public Law 92–574, the Noise Control Act of 1972. The FAA issues special conditions, as defined in 14 CFR 11.19, in accordance with § 11.38, and they become part of the type-certification basis under § 21.17(a)(2). Novel or Unusual Design Features The SF50 will incorporate the following novel or unusual design features: An ATS as part of the automatic flight control system. The ATS utilizes a Garmin ‘‘smart’’ autopilot servo with a physical connection to the throttle quadrant control linkage. The auto throttle may be controlled by the pilot with an optional auto throttle control panel adjacent to the throttle lever. The auto throttle also provides an envelope protection function which does not require installation of the optional control panel. Discussion Part 23 currently does not sufficiently address auto throttle (also referred to as auto thrust) technology and safety concerns. Therefore, special conditions must be developed and applied to this project to ensure an acceptable level of safety has been obtained. For approval to use the ATS during flight, the SF50 must demonstrate compliance to the intent of the requirements of § 25.1329, E:\FR\FM\09DER1.SGM 09DER1 76380 Federal Register / Vol. 80, No. 236 / Wednesday, December 9, 2015 / Rules and Regulations applying the appropriate part 23 references to § 23.1309 (to include performing a functional hazard assessment or system safety assessment to determine the applicable Software and Airborne Electronic Hardware assurance levels, and compliance to DO–178C & DO–254, as required) and § 23.143. In addition, a malfunction of the ATS to perform its intended function is an LOTC event, and may result in a total loss of thrust control, transients, or uncommanded thrust changes. The classification of the failure condition for an LOTC event on a Class II singleengine aircraft is hazardous for aircraft that stall at or below 61 knots. From publication AC 23.1309–1E, based upon failure probability values shown in Figure 2, an LOTC event would have to meet a probability of failure value not to exceed 1 × 10¥6. In-service data for LOTC in single-engine turbine aircraft shows LOTC events exceed this probability; therefore, part 33 requirements for engine control probabilities will be accepted for the part 23 LOTC requirement. The probabilities of failure for an LOTC event on a turbine engine shall not exceed the following (see AC33.28– 1 and ANE–1993–33.28TLD–R1 for further guidance): 1. Average Events per Million Hours: 10 (1×10¥05 per hour) 2. Maximum Events per Million Hours: 100 (1×10¥04 per hour) Note: The maximum events per flight hour are intended for Time Limited Dispatch (TLD) operation where the risk exposure is mitigated by limiting the time in which the aircraft is operated in the degraded condition. wgreen on DSK2VPTVN1PROD with RULES Discussion of Comments Notice of proposed special conditions No. 23–15–04–SC for the Cirrus Aircraft Corporation Model SF50 airplanes was published in the Federal Register on August 21, 2015 (80 FR 50808). No comments were received, and the special conditions are adopted as proposed. Applicability As discussed above, these special conditions are applicable to the Model SF50. Should Cirrus apply at a later date for a change to the type certificate to include another model incorporating the same novel or unusual design feature, the special conditions would apply to that model as well. Under standard practice, the effective date of final special conditions would be 30 days after the date of publication in the Federal Register; however, as the certification date for the Cirrus Aircraft VerDate Sep<11>2014 15:17 Dec 08, 2015 Jkt 238001 Corporation Model SF50 airplane is imminent, the FAA finds that good cause exists to make these special conditions effective upon issuance. Conclusion This action affects only certain novel or unusual design features on one model of airplanes. It is not a rule of general applicability and it affects only the applicant who applied to the FAA for approval of these features on the airplane. List of Subjects in 14 CFR Part 23 Aircraft, Aviation safety, Signs and symbols. Citation The authority citation for these special conditions is as follows: Authority: 49 U.S.C. 106(g), 40113, 44701, 44702, 44704, 14 CFR 21.16 and 14 CFR 11.38 and 11.19. 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 certification basis for Cirrus Aircraft Corporation Model SF50 airplanes. 1. Certification of Auto Throttle System Under Part 23 a. Quick disengagement controls for the auto thrust functions must be provided for each pilot. The auto thrust quick disengagement controls must be located on the thrust control levers. Quick disengagement controls must be readily accessible to each pilot while operating the thrust control levers. b. The effects of a failure of the system to disengage the auto thrust functions when manually commanded by the pilot must be assessed in accordance with the requirements of § 23.1309. c. Engagement or switching of the flight guidance system, a mode, or a sensor may not cause the auto thrust system to affect a transient response that alters the airplane’s flight path any greater than a minor transient, as defined in paragraph (l)(1) of this section. d. Under normal conditions, the disengagement of any automatic control function of a flight guidance system may not cause a transient response of the airplane’s flight path any greater than a minor transient. e. Under rare normal and non-normal conditions, disengagement of any automatic control function of a flight guidance system may not result in a transient any greater than a significant transient, as defined in paragraph (l)(2) of this section. PO 00000 Frm 00026 Fmt 4700 Sfmt 4700 f. The function and direction of motion of each command reference control, such as heading select or vertical speed, must be plainly indicated on, or adjacent to, each control if necessary to prevent inappropriate use or confusion. g. Under any condition of flight appropriate to its use, the flight guidance system may not produce hazardous loads on the airplane, nor create hazardous deviations in the flight path. This applies to both fault-free operation and in the event of a malfunction, and assumes that the pilot begins corrective action within a reasonable period of time. h. When the flight guidance system is in use, a means must be provided to avoid excursions beyond an acceptable margin from the speed range of the normal flight envelope. If the airplane experiences an excursion outside this range, a means must be provided to prevent the flight guidance system from providing guidance or control to an unsafe speed. i. The flight guidance system functions, controls, indications, and alerts must be designed to minimize flight crew errors and confusion concerning the behavior and operation of the flight guidance system. Means must be provided to indicate the current mode of operation, including any armed modes, transitions, and reversions. Selector switch position is not an acceptable means of indication. The controls and indications must be grouped and presented in a logical and consistent manner. The indications must be visible to each pilot under all expected lighting conditions. j. Following disengagement of the auto thrust function, a caution (visual and auditory) must be provided to each pilot. k. During auto thrust operation, it must be possible for the flight crew to move the thrust levers without requiring excessive force. The auto thrust may not create a potential hazard when the flight crew applies an override force to the thrust levers. l. For purposes of this section, a transient is a disturbance in the control or flight path of the airplane that is not consistent with response to flight crew inputs or environmental conditions. (1) A minor transient would not significantly reduce safety margins and would involve flight crew actions that are well within their capabilities. A minor transient may involve a slight increase in flight crew workload or some physical discomfort to passengers or cabin crew. (2) A significant transient may lead to a significant reduction in safety E:\FR\FM\09DER1.SGM 09DER1 Federal Register / Vol. 80, No. 236 / Wednesday, December 9, 2015 / Rules and Regulations margins, an increase in flight crew workload, discomfort to the flight crew, or physical distress to the passengers or cabin crew, possibly including non-fatal injuries. Significant transients do not require, in order to remain within or recover to the normal flight envelope, any of the following: i. Exceptional piloting skill, alertness, or strength. ii. Forces applied by the pilot which are greater than those specified in § 23.143(c). iii. Accelerations or attitudes in the airplane that might result in further hazard to secured or non-secured occupants. It must also be demonstrated, through tests and analysis, that no single failure or malfunction or probable combinations of failures of the auto thrust system components results in the probability for LOTC, or un-commanded thrust changes and transients that result in an LOTC event, to exceed the following: (1) Average Events per Million Hours: 10 (1×10¥05 per hour) (2) Maximum Events per Million Hours: 100 (1×10¥04 per hour) Note: The term ‘‘probable’’ in the context of ‘‘probable combination of failures’’ does not have the same meaning as used for a safety assessment process. The term ‘‘probable’’ in ‘‘probable combination of failures’’ means ‘‘foreseeable,’’ or those failure conditions anticipated to occur one or more times during the operational life of each airplane. Issued in Kansas City, Missouri, on December 2, 2015. Patrick Mullen, Acting Manager, Small Airplane Directorate, Aircraft Certification Service. [FR Doc. 2015–31058 Filed 12–8–15; 8:45 am] BILLING CODE 4910–13–P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2015–3783; Directorate Identifier 2015–SW–027–AD; Amendment 39–18342; AD 2015–25–04] RIN 2120–AA64 Airworthiness Directives; Agusta S.p.A. Helicopters Federal Aviation Administration (FAA), Department of Transportation (DOT). ACTION: Final rule; request for comments. wgreen on DSK2VPTVN1PROD with RULES AGENCY: We are adopting a new airworthiness directive (AD) for Agusta SUMMARY: VerDate Sep<11>2014 15:17 Dec 08, 2015 Jkt 238001 S.p.A. (Agusta) Model A109A and A109A II helicopters. This AD requires inspecting the slider assembly pitch control (slider) for play and replacing the slider if the play exceeds certain limits. This AD is prompted by a report of excessive slider play and wear that was detected during a scheduled inspection of a Model A109A II helicopter. These actions are intended to detect and prevent excessive wear and play on a slider, which could lead to loss of tail rotor pitch control and consequently loss of helicopter control. DATES: This AD becomes effective December 24, 2015. We must receive comments on this AD by February 8, 2016. ADDRESSES: You may send comments by any of the following methods: • Federal eRulemaking Docket: Go to http://www.regulations.gov. Follow the online instructions for sending your comments electronically. • Fax: 202–493–2251. • Mail: Send comments to the U.S. Department of Transportation, Docket Operations, M–30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue SE., Washington, DC 20590–0001. • Hand Delivery: Deliver to the ‘‘Mail’’ address between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. Examining the AD Docket You may examine the AD docket on the Internet at http:// www.regulations.gov by searching for and locating Docket No. FAA–2015– 3783; or in person at the Docket Operations Office between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this AD, the European Aviation Safety Agency (EASA) AD, the economic evaluation, any comments received, and other information. The street address for the Docket Operations Office (telephone 800–647–5527) is in the ADDRESSES section. Comments will be available in the AD docket shortly after receipt. For service information identified in this AD, contact AgustaWestland, Product Support Engineering, Via del Gregge, 100, 21015 Lonate Pozzolo (VA) Italy, ATTN: Maurizio D’Angelo; telephone 39–0331–664757; fax 39– 0331–664680; or at http:// www.agustawestland.com/technicalbulletins. You may review the referenced service information at the FAA, Office of the Regional Counsel, Southwest Region, Room 6N–321, 10101 Hillwood Pkwy, Fort Worth, TX 76177. FOR FURTHER INFORMATION CONTACT: Martin R. Crane, Aviation Safety PO 00000 Frm 00027 Fmt 4700 Sfmt 4700 76381 Engineer, Safety Management Group, Rotorcraft Directorate, FAA, 10101 Hillwood Pkwy, Fort Worth, TX 76177; telephone (817) 222–5110; email martin.r.crane@faa.gov. SUPPLEMENTARY INFORMATION: Comments Invited This AD is a final rule that involves requirements affecting flight safety, and we did not provide you with notice and an opportunity to provide your comments prior to it becoming effective. However, we invite you to participate in this rulemaking by submitting written comments, data, or views. We also invite comments relating to the economic, environmental, energy, or federalism impacts that resulted from adopting this AD. The most helpful comments reference a specific portion of the AD, explain the reason for any recommended change, and include supporting data. To ensure the docket does not contain duplicate comments, commenters should send only one copy of written comments, or if comments are filed electronically, commenters should submit them only one time. We will file in the docket all comments that we receive, as well as a report summarizing each substantive public contact with FAA personnel concerning this rulemaking during the comment period. We will consider all the comments we receive and may conduct additional rulemaking based on those comments. Discussion EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD No. 2015– 0097, dated June 1, 2015, to correct an unsafe condition for Agusta Model A109A and A109A II helicopters. EASA advises that during a scheduled 100flight-hour inspection on a Model A109A II helicopter, unusual play was detected on a part number (P/N) 109– 0130–11–7 slider. Further investigation revealed excessive wear of the slider broaching at the point of contact with the tail rotor shaft. However, the cause of the excessive play and wear has not been determined. This condition, if not detected and corrected, could lead to reduced control of the helicopter, EASA advises. EASA consequently requires repetitive inspections of slider P/N 109–0130–11– 7 more frequently than those performed at the 100-flight-hour inspection and corrective actions depending on the findings. EASA advises that its AD is an interim measure and further AD action may follow. E:\FR\FM\09DER1.SGM 09DER1

Agencies

[Federal Register Volume 80, Number 236 (Wednesday, December 9, 2015)]
[Rules and Regulations]
[Pages 76379-76381]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2015-31058]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 23

[Docket No. FAA-2015-3464; Special Conditions No. 23-272-SC]


Special Conditions: Cirrus Aircraft Corporation, SF50; Auto 
Throttle

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final special conditions.

-----------------------------------------------------------------------

SUMMARY: These special conditions are issued for the Cirrus Aircraft 
Corporation Model SF50 airplane. This airplane will have a novel or 
unusual design feature(s) associated with installation of an Auto 
Throttle System. The applicable airworthiness regulations do not 
contain adequate or appropriate safety standards for this design 
feature. These 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.

DATES: The effective date of these special conditions is December 9, 
2015 and are applicable on December 2, 2015.

FOR FURTHER INFORMATION CONTACT: Jeff Pretz, Regulations and Policy 
Branch, ACE-111, Federal Aviation Administration, Small Airplane 
Directorate, Aircraft Certification Service, ACE-111, 901 Locust, Room 
301, Kansas City, MO 64106; telephone (816) 329-3239, facsimile (816) 
329-4090.

SUPPLEMENTARY INFORMATION: 

Background

    On September 9, 2008, Cirrus Aircraft Corporation applied for a 
type certificate for their new Model SF50. On December 11, 2012 Cirrus 
elected to adjust the certification basis of the SF50 to include 14 CFR 
part 23 through amendment 62. The SF50 is a low-wing, 7-seat (5 adults 
and 2 children), pressurized, retractable gear, carbon composite 
airplane with one turbofan engine mounted partially in the upper aft 
fuselage. It is constructed largely of carbon and fiberglass composite 
materials. Like other Cirrus products, the SF50 includes a 
ballistically deployed airframe parachute. The SF50 has a maximum 
operating altitude of 28,000 feet and the maximum takeoff weight will 
be at or below 6,000 pounds with a range at economy cruise of roughly 
1,000 nautical miles.
    Current part 23 airworthiness regulations do not contain 
appropriate safety standards for an Auto Throttle System (ATS) 
installation; therefore, special conditions are required to establish 
an acceptable level of safety. Part 25 regulations contain appropriate 
safety standards for these systems, making the intent for this project 
to apply the language in Sec.  25.1329 for the auto throttle, while 
substituting Sec.  23.1309 and Sec.  23.143 in place of the similar 
part 25 regulations referenced in Sec.  25.1329. In addition, 
malfunction of the ATS to perform its intended function shall be 
evaluated per the Loss of Thrust Control (LOTC) criteria established 
under part 33 for electronic engine controls. An analysis must show 
that no single failure or malfunction or probable combinations of 
failures of the ATS will permit the LOTC probability to exceed those 
established under part 33 for an electronic engine control.

Type Certification Basis

    Under the provisions of 14 CFR 21.17, Cirrus must show that the 
Model SF50 meets the applicable provisions of part 23, as amended by 
amendments 23-1 through 23-62 thereto.
    If the Administrator finds that the applicable airworthiness 
regulations (i.e., 14 CFR part 23) do not contain adequate or 
appropriate safety standards for the SF50 because of a novel or unusual 
design feature, special conditions are prescribed under the provisions 
of Sec.  21.16.
    Special conditions are initially applicable to the model for which 
they are issued. Should the type certificate for that model be amended 
later to include any other model that incorporates the same or similar 
novel or unusual design feature, the special conditions would also 
apply to the other model under Sec.  21.101.
    In addition to the applicable airworthiness regulations and special 
conditions, the SF50 must comply with the fuel vent and exhaust 
emission requirements of 14 CFR part 34 and the noise certification 
requirements of 14 CFR part 36 and the FAA must issue a finding of 
regulatory adequacy under section 611 of Public Law 92-574, the Noise 
Control Act of 1972.
    The FAA issues special conditions, as defined in 14 CFR 11.19, in 
accordance with Sec.  11.38, and they become part of the type-
certification basis under Sec.  21.17(a)(2).

Novel or Unusual Design Features

    The SF50 will incorporate the following novel or unusual design 
features: An ATS as part of the automatic flight control system. The 
ATS utilizes a Garmin ``smart'' autopilot servo with a physical 
connection to the throttle quadrant control linkage. The auto throttle 
may be controlled by the pilot with an optional auto throttle control 
panel adjacent to the throttle lever. The auto throttle also provides 
an envelope protection function which does not require installation of 
the optional control panel.

Discussion

    Part 23 currently does not sufficiently address auto throttle (also 
referred to as auto thrust) technology and safety concerns. Therefore, 
special conditions must be developed and applied to this project to 
ensure an acceptable level of safety has been obtained. For approval to 
use the ATS during flight, the SF50 must demonstrate compliance to the 
intent of the requirements of Sec.  25.1329,

[[Page 76380]]

applying the appropriate part 23 references to Sec.  23.1309 (to 
include performing a functional hazard assessment or system safety 
assessment to determine the applicable Software and Airborne Electronic 
Hardware assurance levels, and compliance to DO-178C & DO-254, as 
required) and Sec.  23.143.
    In addition, a malfunction of the ATS to perform its intended 
function is an LOTC event, and may result in a total loss of thrust 
control, transients, or uncommanded thrust changes. The classification 
of the failure condition for an LOTC event on a Class II single-engine 
aircraft is hazardous for aircraft that stall at or below 61 knots. 
From publication AC 23.1309-1E, based upon failure probability values 
shown in Figure 2, an LOTC event would have to meet a probability of 
failure value not to exceed 1 x 10-6. In-service data for 
LOTC in single-engine turbine aircraft shows LOTC events exceed this 
probability; therefore, part 33 requirements for engine control 
probabilities will be accepted for the part 23 LOTC requirement.
    The probabilities of failure for an LOTC event on a turbine engine 
shall not exceed the following (see AC33.28-1 and ANE-1993-33.28TLD-R1 
for further guidance):

1. Average Events per Million Hours: 10 (1x10-05 per 
hour)
2. Maximum Events per Million Hours: 100 (1x10-04 per 
hour)

    Note:  The maximum events per flight hour are intended for Time 
Limited Dispatch (TLD) operation where the risk exposure is 
mitigated by limiting the time in which the aircraft is operated in 
the degraded condition.

Discussion of Comments

    Notice of proposed special conditions No. 23-15-04-SC for the 
Cirrus Aircraft Corporation Model SF50 airplanes was published in the 
Federal Register on August 21, 2015 (80 FR 50808). No comments were 
received, and the special conditions are adopted as proposed.

Applicability

    As discussed above, these special conditions are applicable to the 
Model SF50. Should Cirrus apply at a later date for a change to the 
type certificate to include another model incorporating the same novel 
or unusual design feature, the special conditions would apply to that 
model as well.
    Under standard practice, the effective date of final special 
conditions would be 30 days after the date of publication in the 
Federal Register; however, as the certification date for the Cirrus 
Aircraft Corporation Model SF50 airplane is imminent, the FAA finds 
that good cause exists to make these special conditions effective upon 
issuance.

Conclusion

    This action affects only certain novel or unusual design features 
on one model of airplanes. It is not a rule of general applicability 
and it affects only the applicant who applied to the FAA for approval 
of these features on the airplane.

List of Subjects in 14 CFR Part 23

    Aircraft, Aviation safety, Signs and symbols.

Citation

    The authority citation for these special conditions is as follows:

    Authority: 49 U.S.C. 106(g), 40113, 44701, 44702, 44704, 14 CFR 
21.16 and 14 CFR 11.38 and 11.19.

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 certification basis for Cirrus Aircraft Corporation Model SF50 
airplanes.

1. Certification of Auto Throttle System Under Part 23

    a. Quick disengagement controls for the auto thrust functions must 
be provided for each pilot. The auto thrust quick disengagement 
controls must be located on the thrust control levers. Quick 
disengagement controls must be readily accessible to each pilot while 
operating the thrust control levers.
    b. The effects of a failure of the system to disengage the auto 
thrust functions when manually commanded by the pilot must be assessed 
in accordance with the requirements of Sec.  23.1309.
    c. Engagement or switching of the flight guidance system, a mode, 
or a sensor may not cause the auto thrust system to affect a transient 
response that alters the airplane's flight path any greater than a 
minor transient, as defined in paragraph (l)(1) of this section.
    d. Under normal conditions, the disengagement of any automatic 
control function of a flight guidance system may not cause a transient 
response of the airplane's flight path any greater than a minor 
transient.
    e. Under rare normal and non-normal conditions, disengagement of 
any automatic control function of a flight guidance system may not 
result in a transient any greater than a significant transient, as 
defined in paragraph (l)(2) of this section.
    f. The function and direction of motion of each command reference 
control, such as heading select or vertical speed, must be plainly 
indicated on, or adjacent to, each control if necessary to prevent 
inappropriate use or confusion.
    g. Under any condition of flight appropriate to its use, the flight 
guidance system may not produce hazardous loads on the airplane, nor 
create hazardous deviations in the flight path. This applies to both 
fault-free operation and in the event of a malfunction, and assumes 
that the pilot begins corrective action within a reasonable period of 
time.
    h. When the flight guidance system is in use, a means must be 
provided to avoid excursions beyond an acceptable margin from the speed 
range of the normal flight envelope. If the airplane experiences an 
excursion outside this range, a means must be provided to prevent the 
flight guidance system from providing guidance or control to an unsafe 
speed.
    i. The flight guidance system functions, controls, indications, and 
alerts must be designed to minimize flight crew errors and confusion 
concerning the behavior and operation of the flight guidance system. 
Means must be provided to indicate the current mode of operation, 
including any armed modes, transitions, and reversions. Selector switch 
position is not an acceptable means of indication. The controls and 
indications must be grouped and presented in a logical and consistent 
manner. The indications must be visible to each pilot under all 
expected lighting conditions.
    j. Following disengagement of the auto thrust function, a caution 
(visual and auditory) must be provided to each pilot.
    k. During auto thrust operation, it must be possible for the flight 
crew to move the thrust levers without requiring excessive force. The 
auto thrust may not create a potential hazard when the flight crew 
applies an override force to the thrust levers.
    l. For purposes of this section, a transient is a disturbance in 
the control or flight path of the airplane that is not consistent with 
response to flight crew inputs or environmental conditions.
    (1) A minor transient would not significantly reduce safety margins 
and would involve flight crew actions that are well within their 
capabilities. A minor transient may involve a slight increase in flight 
crew workload or some physical discomfort to passengers or cabin crew.
    (2) A significant transient may lead to a significant reduction in 
safety

[[Page 76381]]

margins, an increase in flight crew workload, discomfort to the flight 
crew, or physical distress to the passengers or cabin crew, possibly 
including non-fatal injuries. Significant transients do not require, in 
order to remain within or recover to the normal flight envelope, any of 
the following:
    i. Exceptional piloting skill, alertness, or strength.
    ii. Forces applied by the pilot which are greater than those 
specified in Sec.  23.143(c).
    iii. Accelerations or attitudes in the airplane that might result 
in further hazard to secured or non-secured occupants.
    It must also be demonstrated, through tests and analysis, that no 
single failure or malfunction or probable combinations of failures of 
the auto thrust system components results in the probability for LOTC, 
or un-commanded thrust changes and transients that result in an LOTC 
event, to exceed the following:

(1) Average Events per Million Hours: 10 (1x10-05 per 
hour)
(2) Maximum Events per Million Hours: 100 (1x10-04 per 
hour)

    Note:  The term ``probable'' in the context of ``probable 
combination of failures'' does not have the same meaning as used for 
a safety assessment process. The term ``probable'' in ``probable 
combination of failures'' means ``foreseeable,'' or those failure 
conditions anticipated to occur one or more times during the 
operational life of each airplane.


    Issued in Kansas City, Missouri, on December 2, 2015.
Patrick Mullen,
Acting Manager, Small Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2015-31058 Filed 12-8-15; 8:45 am]
BILLING CODE 4910-13-P