# AD 91-02-09: Hydraulic System - Type: Airworthiness directive - Status: Current - Products: ATR - GIE Avions de Transport R gional ATR42-200, ATR42-300, ATR42-320, ATR42-500, ATR72-101, ATR72-102, ATR72-201, ATR72-202, ATR72-211, ATR72-212 and ATR72-212A - Effective: January 29, 1991 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Large airplane - Amendment: 39-6858 - Docket: 90-NM-276-AD - Registered aircraft: 60 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9FB54CA92C83D62F86256982006FEF53.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/91-02-09 ## The airworthiness directive 91-02-09 AEROSPATIALE: Amendment 39-6858. Docket No. 90-NM-276-AD. Applicability: All Model ATR42 and ATR72 series airplanes, certificated in any category. Compliance: Required as indicated, unless previously accomplished. To prevent unnecessarily shutting off the pump of a hydraulic system that falsely indicated a low level of hydraulic fluid, accomplish the following: A. Within 7 days after the effective date of this AD, perform a test of both hydraulic low level electrical circuits in accordance with Aerospatiale Alert Service Bulletins ATR42-29- A0013 and ATR72-29-A1003, both dated October 26, 1990, as appropriate. If crossed connectors are found, repair prior to further flight, in accordance with the appropriate service bulletin. B. An alternate means of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Standardization Branch, ANM-113, FAA, Transport Airplane Directorate. NOTE: The request should be submitted directly to the Manager, Standardization Branch, ANM-113, and a copy sent to the cognizant FAA Principal Inspector (PI). The PI will then forward comments or concurrence to the Manager, Standardization Branch, ANM-113. C. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD. All persons affected by this directive who have not already received the appropriate service information from the manufacturer may obtain copies upon request to ATR, 316 Route de Bayonne, 31060 Toulouse, Cedex 03, France. This information may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue S.W., Renton, Washington. This amendment (39-6858, AD 91-02-09) becomes effective on January 29, 1991. ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A53EU](https://openairdocs.org/tcds/A53EU): ATR – GIE Avions de Transport Régional; names 11 of 11 models: ATR72-202, ATR72-101, ATR72-212A, ATR72-212, ATR42-300, ATR42-320, ATR72-211, ATR72-102… ## Registered aircraft it may apply to (OpenAirDocs) Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment. - Aircraft: 60 (60 by airframe model, 0 by engine model) - Makers: Aerospatiale/Aeritalia 17, Atr-Gie Avions De Trnsp Rgnl 15, Aerospatiale 9, Aerospatiale/Alenia 6, Atr-Gie Avions De Trnsp Region 6, ATR 3, Aerospatiale/Atr 2, Atr-Gie Avions De Transport 1, Eads/Alenia ATR 1 Models with the most aircraft: - [Atr-Gie Avions De Trnsp Rgnl ATR 72-212A](https://openairdocs.org/model/atr-gie-avions-de-trnsp-rgnl-atr-72-212a): 14 aircraft (airframe model) - [Aerospatiale/Aeritalia ATR 42-300](https://openairdocs.org/model/aerospatiale-aeritalia-atr-42-300): 12 aircraft (airframe model) - [Aerospatiale ATR 72-212](https://openairdocs.org/model/aerospatiale-atr-72-212): 9 aircraft (airframe model) - [Atr-Gie Avions De Trnsp Region ATR42-500](https://openairdocs.org/model/atr-gie-avions-de-trnsp-region-atr42-500): 6 aircraft (airframe model) - [Aerospatiale/Aeritalia ATR 42-320](https://openairdocs.org/model/aerospatiale-aeritalia-atr-42-320): 4 aircraft (airframe model) - [Aerospatiale/Alenia ATR-72-212](https://openairdocs.org/model/aerospatiale-alenia-atr-72-212): 3 aircraft (airframe model) - [ATR ATR72-212A](https://openairdocs.org/model/atr-atr72-212a): 3 aircraft (airframe model) - [Aerospatiale/Atr ATR 72 202](https://openairdocs.org/model/aerospatiale-atr-atr-72-202): 2 aircraft (airframe model) - [Aerospatiale/Alenia ATR 42-320](https://openairdocs.org/model/aerospatiale-alenia-atr-42-320): 2 aircraft (airframe model) - [Atr-Gie Avions De Transport ATR-42-320](https://openairdocs.org/model/atr-gie-avions-de-transport-atr-42-320): 1 aircraft (airframe model) - [Atr-Gie Avions De Trnsp Rgnl ATR 42-300](https://openairdocs.org/model/atr-gie-avions-de-trnsp-rgnl-atr-42-300): 1 aircraft (airframe model) - [Aerospatiale/Aeritalia ATR72-212](https://openairdocs.org/model/aerospatiale-aeritalia-atr72-212): 1 aircraft (airframe model) - [Eads/Alenia ATR ATR 42-500](https://openairdocs.org/model/eads-alenia-atr-atr-42-500): 1 aircraft (airframe model) - [Aerospatiale/Alenia ATR42-500](https://openairdocs.org/model/aerospatiale-alenia-atr42-500): 1 aircraft (airframe model) All 14 models: https://openairdocs.org/ad/91-02-09/models.md Every aircraft: https://openairdocs.org/ad/91-02-09/aircraft.md Its text cites no advisory circulars or STCs. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.