AD 2022-20-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | SAS | Airworthiness Directives; Airbus SAS Airplanes |
| aircraft | Aviat | Various | Airworthiness Directives; Airbus SAS Airplanes |
Unsafe Condition
During operation of a flight test aircraft, it was reported that during heating of several sensing elements of the over-heat detection system (OHDS) loop sequentially, no electronic centralized aircraft monitor (ECAM) warning was triggered. The same behavior was observed in all OHDS loops of the airplane. Investigation identified a missing electrical grounding of the OHDS sensing element up to the bleed monitoring computer (BMC) connector, impairing the OHDS leak detection capability in all OHDS loops of the airplane. This condition, if not detected and corrected, could lead to hot air bleed leakage undetected by the OHDS loops, possibly resulting in exposure of airplane structure and systems (e.g., fuel and hydraulic) to high temperatures and consequent reduced structural integrity of the airplane, fire ignition, or systems malfunction.
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Required Actions
Revising the existing airplane flight manual (AFM) with an AFM Temporary Revision (TR) to provide procedures to operate the airplane without functioning bleed leak detection; revising the operator's existing FAA-approved minimum equipment list (MEL); and modifying the electrical connections of the bleed monitoring computers (BMCs), which allows for the removal of the AFM TR and the MEL revision.
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Compliance Time
Before further flight
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Affected Aircraft
Airbus SAS Model A320-251N, -253N, and -271N airplanes; and Model A321-251N, -253N, -271N, and -272N airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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