Aircraft
Certification Service Washington, DC U.S. Department of Transportation Federal Aviation Administration
NM-10-18
March 4, 2010
This is information only. Recommendations
aren’t mandatory.
Introduction
This Special Airworthiness Information Bulletin (SAIB) advises
registered owners and operators of redesigned aileron sensors for the
flight data recorder (FDR) installed on ATR - GIE Avions de Transport
Regional Model ATR42 and ATR72 airplanes.
Background
Following an incident on a Model ATR72-212 airplane it was determined
that the left aileron surface position data recorded by the FDR was
invalid. Further investigation revealed that incorporation of
Supplemental Type Certificate (STC) ST01310NY or ST01280NY yielded
higher-than-expected levels of incorrect aileron surface position data,
as reported from the FDR. As a result of this incident, Delta
Engineering redesigned the aileron sensors with high cable tension to
reduce cable fatigue, and issued Service Bulletin 2301-06397-2030,
dated September 26, 2008. The service bulletin provides operators with
guidelines for replacing the existing aileron sensors with the new,
improved sensors. At this time, the airworthiness concern is not an
unsafe condition that would warrant airworthiness directive (AD) action
under Title 14 of the Code of Federal Aviation Regulations (14 CFR)
part 39.
Recommendations
The FAA recommends that all owners and operators of ATR - GIE Avions de
Transport Regional Model ATR42 and ATR72 airplanes comply with the
actions outlined in Delta Engineering Service Bulletin 2301-06397-2030,
dated September 26, 2008.
For Further Information Contact
Balram Rambrich, Aerospace Engineer, Avionics and Flight Test Branch,
ANE-172, FAA, New York ACO, 1600 Stewart Avenue, Suite 410, Westbury,
New York 11590; telephone (516) 228-7307; fax (516) 794-5531.
For Related Service Information Contact
Delta Engineering, 13 DRBA Way, New Castle, DE 19720; phone: (302)
325-9320; fax: (302) 325-9420; email: jamoritz@delta-engineering.com.