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.