Airworthiness directives › 2025-16-11
AD 2025-16-11 Airworthiness Directives; Airbus SAS Airplanes
Models named: A321-271NY. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to all Airbus SAS Model A321-271NY airplanes, certificated in any category.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Except as specified in paragraph (h) of this AD: Comply with all required actions and compliance times specified in, and in accordance with, European Union Aviation Safety Agency (EASA) AD 2025-0075R1, dated July 21, 2025 (EASA AD 2025-0075R1).
Unsafe condition
This AD was prompted by the determination that affected parts addressed by other ADs could also be installed in service on this airplane model. The FAA is issuing this AD to address the unsafe conditions identified in paragraphs (e)(1) through (5) of this AD. (1) Overheat detection system (OHDS) sensing elements that do not properly detect thermal bleed leak events. This unsafe condition, if not addressed, could result in an air leak remaining undetected by the OHDS at an affected position and not being isolated during flight, possibly resulting in localized areas of the main landing gear bay and keel beam being exposed to high temperatures and consequent reduced structural integrity of the airplane. (2) Missing heat treatment of the actuation pin of the SafeLav gaseous oxygen container, which could cause its jamming, with consequent failure of oxygen flow activation. This unsafe condition, if not addressed, could result in lack of supplemental oxygen supply in case of decompression in the cabin/lavatory, possibly resulting in injury to lavatory occupants. (3) Poor reactivity of the start powder used inside the affected oxygen generators. This unsafe condition, if not addressed, could lead to a reduction of the available oxygen capacity of the airplane and could result in injury to airplane occupants. (4) Improper installation of the trimmable horizontal stabilizer actuator (THSA) ball screw jack, which can compromise the failsafe design of the THSA. This unsafe condition, if not addressed, could result in uncontrolled movement of the horizontal stabilizer as a result of a single failure of the THSA and consequent loss of control of the airplane. (5) Erroneous accumulated life information in the THSA release certificate, which could lead to operation of the THSA beyond the certificated life limit. This unsafe condition, if not addressed, could result in failure of the THSA and consequent reduced controllability of the airplane.
Affected ADs
None.
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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