Airworthiness Directive · Amendment 39-21553 · Electrical power
ATR-GIE Avions de Transport Régional Airplanes
Superseded. A later AD replaced this one: AD 2023-19-07. Comply with the one in force.
This AD applies to ATR—GIE Avions de Transport Régional Model ATR42-500 and ATR72-212A airplanes, certificated in any category, as identified in European Union Aviation Safety Agency (EASA) Emergency AD 2021-0120-E, dated May 3, 2021 (EASA Emergency AD 2021-0120-E).
The FAA is adopting a new airworthiness directive (AD) for certain ATR--GIE Avions de Transport R[eacute]gional Model ATR42-500 and ATR72-212A airplanes. This AD was prompted by reports of temporary loss of all display units and the integrated electronic standby instrument (IESI). This AD requires revising the existing aircraft flight manual (AFM) and applicable corresponding operational procedures to update a systems limitation, limiting dispatch with certain equipment inoperative, performing an operational test of a certain contactor and an electrical test of a certain battery toggle switch, and corrective actions if necessary, 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.
Except as specified in paragraph (h) of this AD: Comply with all required actions and compliance times specified in, and in accordance with, EASA Emergency AD 2021-0120-E.
(1) Where EASA Emergency AD 2021-0120-E refers to its effective date, this AD requires using the effective date of this AD.
(2) Paragraph (1) of EASA Emergency AD 2021-0120-E specifies amending “the applicable AFM [aircraft flight manual],” but this AD requires amending “the applicable existing AFM and applicable corresponding operational procedures.”
(3) Where paragraphs (1) and (2) of EASA Emergency AD 2021-0120-E specify to “inform all flight crews, and, thereafter, operate the aeroplane accordingly,” this AD does not require those actions as those actions are already required by existing FAA operating regulations.
(4) Where paragraph (5) of EASA Emergency AD 2021-0120-E specifies actions if “discrepancies are detected,” for this AD a “discrepancy” is defined as a lack of power supply to DU 4 or a static inverter 1 INV FAULT not being displayed on 29VU.
(5) The “Remarks” section of EASA Emergency AD 2021-0120-E does not apply to this AD.
(6) Paragraph(s) (6) and (7) of EASA Emergency AD 2021-0120-E specify to report test results to ATR within a certain compliance time. For this AD, report test results at the applicable time specified in paragraph (h)(6)(i) or (ii) of this AD.
(i) If the test was done on or after the effective date of this AD: Submit the report within 10 days after the test.
(ii) If the test was done before the effective date of this AD: Submit the report within 10 days after the effective date of this AD.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
