AD 2022-19-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | SAS | Airworthiness Directives; Airbus SAS Airplanes |
| aircraft | Aviat | Various | Airworthiness Directives; Airbus SAS Airplanes |
Unsafe Condition
A leaking high pressure valve (HPV) may expose the pressure regulating valve (PRV) to high pressure, possibly damaging the PRV itself and preventing its closure. The unsafe condition, if not addressed, could result in high pressure and temperatures in the duct downstream from the PRV, with possible duct burst, damage to several systems, and consequent loss of control of the airplane.
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Required Actions
Revision of the existing airplane flight manual (AFM) to incorporate additional limitations prohibiting takeoff for certain airplane configurations; airplane dispatch restrictions using certain provisions of the A330 master minimum equipment list (MMEL) or amending the existing FAA-approved operator's minimum equipment list (MEL); repetitive replacement of the HPV clips; revision of the Limitations section of the existing AFM to provide procedures to mitigate the risk of a non-isolated overpressure or overtemperature in the case of an excessive leak of the engine bleed HPV; implementation of the instructions of the MMEL update on the basis of which the operator's MEL must be amended with new provisions and procedures for the following items: Air Conditioning Pack, Engine Bleed Air Supply System, Engine Bleed IP (Intermediate Pressure) Check Valve, and Engine Bleed HP Valve; a seal integrity test of each HPV, and corrective actions (including replacing the HPV, and a detailed inspection of the wing bellow on engine 1(2) and replacement of any damaged or deformed wing bellow); HPV troubleshooting procedure and additional maintenance actions after any Class 1 maintenance message associated to an HPV fault, and corrective actions (including replacing HPV or wing bellow); HPV seal integrity test and the additional maintenance actions after any Class 1 or Class 2 maintenance message associated to a PRV fault, and corrective actions (including replacing the HPV and PRV, and a detailed inspection of the wing bellow on engine 1(2) and replacement of any damaged or deformed wing bellow); a visual (borescope) inspection of the engine bleed air system (EBAS) to detect signs of foreign object debris (FOD), including metallic debris in the butterfly valve and dents or damage of the flaps of the intermediate pressure check valve (IPCV), and dents and missing segments in the PRV, the header of the high pressure/intermediate pressure (HP/IP) duct, the y-duct, and the pylon ducts after any failure of an HPV clip and/or any of the HPV butterfly sealing rings, and corrective actions (including removing FOD and replacing the IPCV or PRV); a seal integrity test of each HPV after any take-off or go-around accomplished with ``packs OFF'' or ``APU bleed ON'' or ``engine bleed OFF,'' and corrective action
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Compliance Time
Before further flight
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Affected Aircraft
Airbus SAS Model A330-841 and -941 airplanes
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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