# Airworthiness Directives; Airbus SAS Airplanes
> **Rule** · Final rule. · Published 2021-06-30 · Effective 2021-08-04 · 86 FR 34623
## Document
- **Document number:** 2021-13781
- **Category:** airworthiness
- **Manufacturer:** Airbus SAS
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 86 FR 34623
- **Publication date:** 2021-06-30
- **Effective date:** 2021-08-04
- **FAA docket:** Docket No. FAA-2021-0184
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all Airbus SAS Model A330-200, A330-200 Freighter, A330-300, A340-200, and A340-300 series airplanes. This AD was prompted by a report that the auxiliary power unit (APU) aft fuel pump printed circuit board (PCB) varnish had deteriorated; the varnish is one of the layers of protection against development of an ignition source. This AD requires replacing each affected APU aft fuel pump, as specified in a European Union Aviation Safety Agency (EASA) AD, which is incorporated by reference. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/06/30/2021-13781/airworthiness-directives-airbus-sas-airplanes)
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