88-04-03 AEROSPATIALE: Amendment 39-5846. Applies to Model ATR-42 series airplanes, as listed in Service Bulletin ATR42-23-0002, Revision No. 1, dated March 11, 1987, certificated in any category. Compliance is required within one year of the effective date of this AD, unless previously accomplished.
To prevent the loss of recorded information by continued operation of the Digital Flight Data Recorder (DFDR) and Cockpit Voice Recorder (CVR) after an accident, accomplish the following:
A. Modify the DFDR and CVR power supply logic in accordance with Aerospatiale Service Bulletin ATR42-23-0002, Revision No. 1, dated March 11, 1987.
B. An alternate means of compliance or adjustment of the compliance time, which provides an acceptable level of safety and has the concurrence of an FAA Principal Maintenance Inspector, may be used when approved by the Manager, Standardization Branch, ANM-113, FAA, Northwest Mountain Region.
C. Special flight permits may be issued inaccordance with FAR 21.197 and 21.199 to operate airplanes to a base for the accomplishment of inspections and/or modifications required by 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, 17900 Pacific Highway South, Seattle, Washington, or at the Seattle Aircraft Certification Office, 9010 East Marginal Way South, Seattle, Washington.
This amendment becomes effective March 21, 1988.