Airworthiness directives › 2014-05-27
AD 2014-05-27 Airworthiness Directives; Rockwell Collins, Inc. Transponders
Applicability*9
(1) This AD applies to the following Rockwell Collins, Inc. Mode S transponders that are installed on but not limited to the airplanes listed in paragraphs (c)(2)(i) and (c)(2)(ii) of this AD: (i) TPR-720: CPN 622-7878-001, 622-7878-020, 622-7878-120, 622-7878-200, 622-7878-201, 622-7878-301, 622-7878-440, 622-7878-460, 622-7878-480, 622-7878-901; and (ii) TPR-900: CPN 822-0336-001, 822-0336-020, 822-0336-220, 822-0336-440, 822-0336-460, 822-0336-480, 822-0336-902. (2) The products listed in paragraphs (c)(1)(i) and (c)(1)(ii) of this AD may be installed on but not limited to the following airplanes, certificated in any category: (i) Airbus Models A319, A320, A330, A340; and (ii) The Boeing Company Models B737, B747, B757, B767, B777, MD-80, and DC-9. (3) The listing of airplanes in paragraphs (c)(2)(i) and (c)(2)(ii) of this AD is not intended as all-inclusive. The affected transponders may be installed using a supplemental type certificate or other means on other airplanes not listed in those paragraphs.
Compliance
Comply with this AD within the compliance times specified in paragraph (g) of this AD, unless already done.
Required actions
(1) Within the next 2 years after the effective date of this AD and repetitively thereafter at intervals not to exceed every 4 years, send the TPR-720 and TPR-900 Mode S transponders to a properly certified repair facility for test and calibration to assure proper alignment following Rockwell Collins Service Information Letter 13-1, Revision No. 1, 523-0821603-101000, dated October 24, 2013. (2) Rockwell Collins Service Information Letter 13-1, Revision No. 1, 523-0821603-101000, dated October 24, 2013, recommends the affected transponders be sent to a Rockwell Collins authorized repair facility for the alignment and return to service testing; however, any properly certified repair facility may do this alignment and return to service testing.
Unsafe condition
This AD was prompted by the identification that the TPR-720 and TPR-900 Mode S transponders respond intermittently to Mode S interrogations from both ground-based and traffic collision avoidance system equipped airplanes. We are issuing this AD to correct possible misalignment issues with the transponders that could result in increased pilot and air traffic controller workload as well as reduced separation of airplanes.
Affected ADs
None.
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