Airworthiness directives › 2025-19-01
AD 2025-19-01 Airworthiness Directives; Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.) Airplanes
Models named: BD-500-1A10, Model BD-500-1A11. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Airbus Canada Limited Partnership (type certificate previously held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.) Model BD-500-1A10 and Model BD-500-1A11 airplanes, certificated in any category, as identified in Transport Canada AD CF-2024-36, dated October 22, 2024 (Transport Canada AD CF-2024-36).
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
This paragraph restates the requirements of paragraph (g) of AD 2022-25-51, with no changes. Within 7 days after December 27, 2022 (the effective date of AD 2022-25-51), revise the Limitations section of the existing airplane flight manual (AFM) to include the information specified in figure 1 to paragraph (g) of this AD. This may be accomplished by inserting a copy of figure 1 to paragraph (g) of this AD into the existing AFM. Using an AFM revision that includes information identical to that in figure 1 to paragraph (g) of this AD is acceptable for compliance with the requirement of this paragraph. Figure 1 to Paragraph (g)—Autopilot and Autothrottle Engagement Limitation ER18SE25.010
Unsafe condition
This AD was prompted by multiple in-service reports associated with primary flight control computer (PFCC) software deficiencies leading to nuisance messages on the engine-indicating and crew-alerting system (EICAS) due to erroneous transmissions from the remote electronic unit (REU). Investigations also indicated design deficiencies in the PFCC software and a lack of software robustness, which may not prevent an un-annunciated deployment of ground spoilers or an inadvertent autopilot engagement during the take-off roll. The FAA is issuing this AD to address the PFCC software deficiencies leading to nuisance messages and the lack of PFCC software robustness. The unsafe condition, if not addressed, could lead to increased flightcrew workload as well as a large reduction of safety margins. Additionally, during specific flight phases or in combination with other failures, these conditions could lead to loss of control of the airplane.
Affected ADs
This AD replaces AD 2022-25-51, Amendment 39-22282 (87 FR 75911, December 12, 2022) (AD 2022-25-51).
Read the original on the Federal Register →
You just looked this one up by hand
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1