Airworthiness directives › 2020-10-05
AD 2020-10-05 Airworthiness Directives; Rockwell Collins, Inc. Flight Management Systems
Applicability*9
This AD applies to Rockwell Collins, Inc. (Rockwell Collins) Pro Line 4 and Pro Line 21 Flight Management Systems installed on airplanes, certificated in any category, that has a flight management computer (FMC) with a Rockwell Collins part number (RCPN) listed in paragraph (c)(1) of this AD and with a configuration strapping unit (CSU) listed in paragraph (c)(2) of this AD. (1) FMC-3000 RCPN 822-0883-031, -036, -038, -040, -041, -053, -054, -056, -057, -058, -059, -060, -081, -082, -083, -084; FMC-4200 RCPN 822-0783-022, -025, -028, -032, -036, -039, -040; FMC-5000 RCPN 822-0891-021, -027, -028, -034, -040; or FMC-6000 RCPN 822-0868-074, -075, -082, -083, -084, -085, -087, -089, -090, -109, -110, -111, -112, -113, -114, -116, -117, -122, -123, -127, -130, -132, -133, -134, -139. (2) CSU-3100 RCPN 822-1363-002, CSU-4000 RCPN 822-0049-002, or CSU-4100 RCPN 822-1364-002. Note 1 to paragraph (c) of this AD: To determine the CSU and FMC unit RCPN, refer to the aircraft manufacturer or applicable STC holder maintenance instructions for accessing them.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within the next 12 months after June 24, 2020 (the effective date of this AD), disable the automatic temperature compensation feature on the CSU by following steps (2) through (6) of the Instructions in Rockwell Collins Service Information Letter CSU-XX00-18-1, dated June 27, 2018.
Unsafe condition
This AD was prompted by reports of the FMC software issuing incorrect turn commands when the altitude climb field is edited or when the temperature compensation is activated. The FAA is issuing this AD to prevent the FMC from issuing an incorrect turn direction command. The unsafe condition, if not addressed, could result in a collision or controlled flight into terrain.
Affected ADs
None.
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