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2020-03-50 CIRRUS DESIGN CORPORATION:
( e m e r g e n c y )
Product Identifier 2020-CE-001-AD.

(a) EFFECTIVE DATE

    This Emergency AD is effective upon receipt.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This  AD  applies  to  Cirrus Design Corporation Model SF50 airplanes,
    serial  numbers  0005  through  0176  and  0178, certificated  in  any
    category.

(d) SUBJECT

    Joint Aircraft System Component (JASC)/Air Transport Association (ATA)
    of America Code 23; Communications.

(e) UNSAFE CONDITION

    This AD was prompted  by  a  cabin fire incident  that  occurred  on a
    Cirrus Model SF50 airplane during ground operations. The investigation
    into the incident determined the probable root cause was a malfunction
    of the headset amplifier (part number (P/N) 38849-001)  and the micro-
    phone interface (P/N 35809-001) circuit card assemblies  for  the  3.5
    millimeter (mm) audio and microphone jacks. The FAA is issuing this AD
    to prevent  an electrical short and subsequent uncontained cabin fire,
    which could result in occupant injury or loss of airplane control.

(f) COMPLIANCE

    Comply  with this  AD within  the compliance  times specified,  unless
    already done.

(g) CORRECTIVE ACTION

    Before further flight, disconnect and remove the headset amplifier and
    microphone  interface  circuit   card  assemblies  by   following  the
    Accomplishment Instructions,  steps A.  and G.  through K.,  of Cirrus
    Alert Service Bulletin Number SBA5X-23-03, dated February 7, 2020.

(h) SPECIAL FLIGHT PERMIT

    Special flight permits are prohibited.

(i) ALTERNATIVE METHODS OF COMPLIANCE (AMOCS)

(1) The  Manager,  Chicago ACO Branch,  FAA,  has the authority to approve
    AMOCs for this AD, if requested  using the procedures found in 14  CFR
    39.19. In  accordance with  14 CFR  39.19, send  your request  to your
    principal  inspector  or  local Flight  Standards District  Office, as
    appropriate. If  sending information  directly to  the manager  of the
    certification  office,  send  it  to  the  attention  of  the   person
    identified in paragraph (j)(1) of this AD.

(2) Before using any approved AMOC,  notify your appropriate principal in-
    spector,  or  lacking a principal inspector,  the manager of the local
    flight standards district office/certificate holding district office.

(j) RELATED INFORMATION

(1) For further information about this AD,  contact: Joseph Dubusky, Aero-
    space Engineer, Chicago ACO Branch, FAA,  2300 East Devon Avenue, Room
    107, Des Plaines, Illinois 60018;  phone: 847-294-7543;  fax: 847-294-
    7834; email: joseph.dubusky@faa.gov.

(2) For copies of the service information referenced in this AD,  contact:
    Cirrus Design Corporation; 4515 Taylor Circle Duluth, MN 55811; phone:
    (800) 279-4322;  email:  info@cirrusaircraft.com;  Internet:  https://
    cirrusaircraft.com.  You may view  this referenced service information
    at the FAA,  Policy and Innovation Division,  901 Locust, Kansas City,
    Missouri 64106.  For information  on the availability of this material
    at the FAA, call (816) 329-4148.

Issued on February 14, 2020
PREAMBLE 

DATE: February 14, 2020
AD #: 2020-03-50

Emergency Airworthiness Directive (AD) 2020-03-50 is sent to owners and operators of Cirrus Design Corporation (Cirrus) Model SF50 airplanes.

Background

This emergency AD was prompted by a cabin fire incident that occurred recently on a Cirrus Model SF50 airplane during ground operations. The operator observed smoke exiting from behind the right sidewall interior panel located behind crew seat 2 and forward of passenger seat 5. The investigation into the incident determined the probable root cause was a malfunction of the headset amplifier (part number (P/N) 38849-001) and the microphone interface (P/N 35809-001) circuit card assemblies for the 3.5 millimeter (mm) audio and microphone jacks. This malfunction can result in an electrical short and subsequent uncontained cabin fire without activating circuit protection. This condition, if not addressed, could lead to uncontained cabin fire, resulting in possible occupant injury or loss of airplane control.

Relevant Service Information

The FAA reviewed Cirrus Alert Service Bulletin Number SBA5X-23-03, dated February 7, 2020 (SBA5X-23-03). The service information contains instructions to disconnect and remove the headset amplifier and microphone interface circuit card assemblies for the 3.5 mm audio and microphone jacks.

FAA’s Determination

The FAA is issuing this AD because it evaluated all the relevant information and determined the unsafe condition described previously is likely to exist or develop in other products of the same type design.

AD Requirements

This AD requires accomplishing the actions specified in SBA5X-23-03 as described previously.

Interim Action

The FAA considers this AD, which addresses malfunction of the headset amplifier and the microphone interface circuit card assemblies, an interim action. Cirrus is developing corrective action that will address the unsafe condition identified in this AD. Once this action is developed, approved, and available, the FAA may consider additional rulemaking.

Authority for this Rulemaking

Title 49 of the United States Code specifies the FAA’s authority to issue rules on aviation safety. Subtitle I, Section 106, describes the authority of the FAA Administrator. Subtitle VII, Aviation Programs, describes in more detail the scope of the Agency’s authority.

The FAA is issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III, Section 44701, General requirements. Under that section, Congress charges the FAA with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce. This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action.

This AD is issued in accordance with authority delegated by the Executive Director, Aircraft Certification Service, as authorized by FAA Order 8000.51C. In accordance with that order, issuance of ADs is normally a function of the Compliance and Airworthiness Division, but during this transition period, the Executive Director has delegated the authority to issue ADs applicable to small airplanes, gliders, balloons, airships, domestic business jet transport airplanes, and associated appliances to the Director of the Policy and Innovation Division.

Presentation of the Actual AD

The FAA is issuing this AD under 49 U.S.C. Section 44701 according to the authority delegated to me by the Administrator.