AD 2017-11-11 Airworthiness Directives; NavWorx, Inc. Automatic Dependent Surveillance Broadcast Universal Access Transceiver Units

This AD becomes effective July 11, 2017.

(1) The Manager, Fort Worth Aircraft Certification Office, FAA, may approve AMOCs for this AD. Send your proposal to: Kyle Cobble, Aviation Safety Engineer, Fort Worth Aircraft Certification Office, Rotorcraft Directorate, FAA, 10101 Hillwood Pkwy, Fort Worth, TX 76177, telephone (817) 222-5172, email kyle.cobble@faa.gov; or Michael Heusser, Program Manager, Continued Operational Safety Branch, Fort Worth Aircraft Certification Office, Rotorcraft Directorate, 10101 Hillwood Pkwy, Fort Worth, TX 76177, telephone (817) 222-5038, email michael.a.heusser@faa.gov. (2) For operations conducted under a 14 CFR part 119 operating certificate or under 14 CFR part 91, subpart K, we suggest that you notify your principal inspector, or lacking a principal inspector, the manager of the local flight standards district office or certificate holding district office before operating any aircraft complying with this AD through an AMOC.

NavWorx Airplane Flight Manual Supplement for ADS600-B as installed under Supplemental Type Certificate (STC) No. SA11172SC, approved May 4, 2014; NavWorx Installation Manual for ADS600-B Part 23 AML STC 240-0021-00-07, Revision 7, dated May 4, 2014; and NavWorx STC Master Drawing List 240-0013-00, Revision 10, dated May 29, 2014, which are not incorporated by reference, contain additional information about the subject of this AD. For service information identified in this AD, contact NavWorx Inc.; telephone (888) 628-9679; email: support@navworx.com or at www.navworx.com. You may review a copy of this information at the FAA, Office of the Regional Counsel, Southwest Region, 10101 Hillwood Pkwy, Room 6N-321, Fort Worth, TX 76177.

(1) Within 6 months, comply with either paragraph (e)(1)(i), (ii), (iii), or (iv) of this AD: (i) Remove the ADS-B unit. (ii) Disable and prohibit use of the ADS-B unit as follows: (A) Pull and secure the circuit breaker and disconnect the internal GPS antenna connector from the ADS-B unit and secure. (B) Install a placard in view of the pilot that states “USING THE ADS-B SYSTEM IS PROHIBITED.” (C) Revise the Limitations section of the Aircraft Flight Manual supplement (AFMS) by inserting a copy of this AD or by making pen-and-ink changes to add the following: “USING THE ADS-B SYSTEM IS PROHIBITED.” (iii) Revise the software so the ADS-B unit broadcasts a SIL of 0. (iv) Couple the ADS-B unit with an approved external GPS as follows: (A) Interface the ADS-B unit with an Accord NexNav mini LRU GPS Receiver P/N 21000. (B) Revise the Limitations section of the AFMS by inserting a copy of this AD or by making pen-and-ink changes to add the following: “OPERATION USING THE INTERNAL POSITION SOURCE IS PROHIBITED. USE OF THE ACCORD NEXNAV MINI P/N 21000 EXTERNAL POSITION SOURCE IS REQUIRED.” (2) After the effective date of this AD, do not install an ADS-B unit Model ADS600-B P/N 200-0012, Model ADS600-B P/N 200-0013, or Model ADS600-EXP P/N 200-8013 on any aircraft unless you have complied with the requirements of paragraph (e)(1)(ii), (e)(1)(iii), or (e)(1)(iv) of this AD.

This AD defines the unsafe condition as an ADS-B unit incorrectly broadcasting a Source Integrity Level (SIL) of 3 instead of its authorized SIL of 0. This condition could result in the unit communicating unreliable position information to Air Traffic Control and nearby aircraft and a subsequent aircraft collision.