FAA SPECIAL AIRWORTHINESS
Aviation Safety INFORMATION BULLETIN
SAIB: NM-17-15
SUBJ: Equipment/Furnishings – Inflatable Airbag Assembly Date: June 6, 2017
This is information only. Recommendations aren’t mandatory.
Introduction
This Special Airworthiness Information Bulletin is to advise owners and operators, and the original
equipment manufacturer of The Boeing Company Model 777, 787-8 and 787-9 airplanes of the
potential for inadvertent airbag deployments on certain AmSafe Aviation, Inc., (AmSafe) NexGen
systems installed in aircraft seatbelts.
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 Regulations (14 CFR) part 39.
Background
Since November 2013, the FAA has been notified of nine inadvertent airbag deployments of the
AmSafe NexGen system installed in aircraft seatbelts. One deployment resulted in the fatality of a
mechanic servicing the seatbelt. In 2015, AmSafe conducted a fleet campaign to retrofit affected
airplanes with improved components. AmSafe also provided revised Instructions for Continued
Airworthiness (ICAs). Since that time, there have been no further incidents. While the 2015 fleet
campaign did correct the identified causes of inadvertent airbag deployments, some faulty parts were
not returned to AmSafe and may still be in the field.
The causes of the inadvertent airbag deployments include:
1. Unacceptable maintenance practices: Not properly following the ICAs; mishandling the
device (e.g., dropping a seat or Electronic Module Assembly (EMA), resulting in inadvertent
triggering of the EMA); or publishing abbreviated supplier ICAs in the Aircraft Maintenance
Manual, which could result in misinterpretation of instructions and misinterpretation of the
diagnostic test light emitting diode indicators, resulting in inadequate understanding of the
EMA arming status.
2. Design deficiencies: Prior designs did not have adequate protection against electrical shorts.
Incompatible components in the airbag system or foreign object debris may have contributed
to electrical shorts, which could cause inadvertent airbag deployment.
3. Improper routing of the airbag wire harness in the seat assembly by seat manufacturers:
Improper routing resulted in chafing and/or breaking of wire harnesses during seat movement
leading to electrical shorts in the airbag system, which could cause inadvertent airbag
deployment.
The FAA finds that the voluntary corrective actions taken to date on this issue have reduced the risk
(likelihood) of inadvertent airbag deployments to an acceptable level, such that the potential for
inadvertent airbag deployments is not an unsafe condition warranting AD action. The FAA
recommends incorporation of the service information referenced below to further reduce the
potential for inadvertent airbag deployments.
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Recommendations
The FAA recommends incorporating the applicable accomplishment instructions and procedures
outlined in the following service information to address corresponding issues on installed or spare
seats for Boeing Model 777, 787-8, and 787-9 airplanes having any affected part. Any installation or
maintenance of the airbag assembly or access to it should be done as specified in the applicable seat
manufacturer’s ICAs. Faulty parts or components should be returned to AmSafe to ensure
configuration control.
EMA Replacement, Part Number (P/N) 511959-( )-( ):
• AmSafe Service Bulletin 511959-25-01, Issue 1, dated August 28, 2015.
• Boeing Service Bulletin 777-25-0658, Revision 1, dated September 20, 2016.
• Boeing Service Bulletin 787-81205-SB250117-00, Issue 001, dated September 30, 2015.
Hi-Potential Testing of Cable Interface Assembly, P/N 511410-( )-( ):
• AmSafe Service Bulletin 511410-25-01, Issue 3, dated February 25, 2015.
• Boeing Service Bulletin 777-25-0641, dated March 19, 2015.
Utilizing Latest ICA and EMA Pre-check Process:
Ensure the latest ICA revisions are incorporated using the following service information:
• AmSafe Installation Instructions E512756, Revision G, dated August 29, 2016.
• AmSafe Service Bulletin 511959-25-02, Issue 3, dated April 1, 2016.
The following earlier versions of applicable service information may also be used to address the
actions recommended in this SAIB:
• Boeing Service Bulletin 777-25-0658, Original Issue, dated September 29, 2015.
(Note: See Revision 1 for action on spare parts.)
• AmSafe Installation Instructions E512756, Revision C, dated May 28, 2015.
• AmSafe Installation Instructions E512756, Revision D, dated August 10, 2015.
• AmSafe Installation Instructions E512756, Revision E, dated January 20, 2016.
• AmSafe Installation Instructions E512756, Revision F, dated March 17, 2016.
• AmSafe Service Bulletin 511959-25-02, Issue 1, dated December 21, 2015.
• AmSafe Service Bulletin 511959-25-02, Issue 2, dated January 4, 2016.
For Further Information Contact
Caspar Wang, Aerospace Engineer, Cabin Safety and Environmental Systems Branch, ANM-150S,
FAA, Seattle Aircraft Certification Office, 1601 Lind Avenue SW., Renton, WA 98057-3356;
telephone: 425-917-6414; fax: 425-917-6590; email:
[email protected].
Patrick Farina, Aerospace Engineer, Cabin Safety and Environmental Systems Branch, ANM-150L,
FAA, Los Angeles Aircraft Certification Office, 3960 Paramount Boulevard, Lakewood, CA
90712-4137; telephone: 562-627-5344; fax: 562-627-5210; email:
[email protected].
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For Related Service Information Contact
Boeing Commercial Airplanes, Attention: Contractual & Data Services (C&DS), 2600 Westminster
Blvd., MC 110-SK57, Seal Beach, CA 90740; telephone 562-797-1717.
AmSafe Aviation, Inc., 1043 North 47th Avenue, Phoenix, AZ 85043; telephone 602-850-2850;
fax 602-850-2812; email:
[email protected].
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Please find attached a Foreign State of Design Advisory document, endorsed by EASA.
This advisory document is also online at https://ad.easa.europa.eu/ad/NM-17-15 .
Should you have any questions, please contact the Agency by e-mail at
[email protected] or by fax,
No.: +49 221 89990 9515.
Safety Information Section Email:
[email protected]
EASA Website
(Attachment is in Acrobat PDF format)
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