# AD 90-19-06: Main Landing Gear - Type: Airworthiness directive - Status: Historical - Products: ATR GIE Avions de Transport R gional ATR42-300 and ATR42-320 - Effective: October 23, 1990 - Superseded by: [AD 99-08-09](https://openairdocs.org/ad/99-08-09) - Product type: Aircraft, Large airplane - Amendment: 39-6727 - Docket: 90-NM-101-AD - Registered aircraft: 20 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/AC1C2FA68231BF8A86256A1700502140.0001 - DRS record last changed: August 7, 2025 - Page: https://openairdocs.org/ad/90-19-06 ## The airworthiness directive 90-19-06 AEROSPATIALE: Amendment 39-6727. Docket No. 90-NM-101-AD. Applicability: Model ATR42-300 and ATR42-320 series airplanes, Serial Numbers 003 through 164, which have not been modified in accordance with Aerospatiale Service Bulletin ATR42-32-0023, Revision 1, dated April 20, 1989; or ATR42-53-0045, Revision 1, dated April 21, 1989; or ATR42-53-0050 (Modification 2221), dated January 25, 1990; certificated in any category. Compliance: Required as indicated, unless previously accomplished. To prevent failure of the main landing gear (MLG) actuator fitting bolts due to an incorrect perpendicularity between the bolt hole axis and the fitting surface, accomplish the following: A. For airplanes Serial Numbers 003 through 155: Within 90 days after December 21, 1989 (the effective date of AD 89-24-08, Amendment 39-6396), inspect the MLG actuator fitting bolt holes for correct perpendicularity, elongation, and alignment between the bolthole axis and the fitting surface, in accordance with Aerospatiale Service Bulletin ATR42-53-0045, Revision 1, dated April 21, 1989, or Revision 2, dated January 21, 1990. 1. If no discrepancies are found, reassemble in accordance with the service bulletin. 2. If discrepancies are found, prior to further flight, rework the fitting surface and replace the bolts in accordance with the service bulletin. B. For airplanes Serial Numbers 156 through 164: Within 90 days after the effective date of this amendment, inspect the MLG actuator fitting bolt holes for correct perpendicularity, elongation, and alignment between the bolt hole axis and the fitting surface, in accordance with Aerospatiale Service Bulletin ATR42-53-0045, Revision 1, dated April 21, 1989, or Revision 2, dated January 21, 1990. 1. If no discrepancies are found, reassemble in accordance with the service bulletin.2. If discrepancies are found, prior to further flight, rework the fitting surface and replace the bolts in accordance with the service bulletin. C. 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. D. 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 documents from the manufacturer may obtain copies upon request to Aerospatiale, 316 Route de Bayonne, 31060 Toulouse, Cedex 03, France. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue S.W., Renton, Washington. Airworthiness Directive 90-19-06 supersedes AD 89-24-08, Amendment 39-6396. This amendment (39-6727, AD 90-19-06) becomes effective on October 23, 1990. ## 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 2 of 11 models: ATR42-300, ATR42-320 ## 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: 20 (20 by airframe model, 0 by engine model) - Makers: Aerospatiale/Aeritalia 16, Aerospatiale/Alenia 2, Atr-Gie Avions De Transport 1, Atr-Gie Avions De Trnsp Rgnl 1 Models with the most aircraft: - [Aerospatiale/Aeritalia ATR 42-300](https://openairdocs.org/model/aerospatiale-aeritalia-atr-42-300): 12 aircraft (airframe model) - [Aerospatiale/Aeritalia ATR 42-320](https://openairdocs.org/model/aerospatiale-aeritalia-atr-42-320): 4 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) All 5 models: https://openairdocs.org/ad/90-19-06/models.md Every aircraft: https://openairdocs.org/ad/90-19-06/aircraft.md ## Related documents - [AD 99-08-09](https://openairdocs.org/ad/99-08-09): Main Landing Gear Actuator Fitting Bolts · ATR - GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320 and 1 more. Effective May 17, 1999. Supersedes this AD 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.