AD 2009-21-10 R1

AD Final Rules - 2009-21-10 R1.pdf
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AD Number:
2009-21-10 R1
Document Type:
AD Final Rules
Docket Number:
FAA-2010-0029
Subject Heading:
Airworthiness Directives; AVOX Systems and B/E Aerospace Oxygen Cylinder Assemblies, as Installed on...Show more
Subject:
Oxygen
Status:
Current
Citation:
(Federal Register: January 20, 2010 (Volume 75, Number 12))
Citation Publish Date:
01/20/2010
Effective Date:
02/04/2010
Make:
Airbus | The Boeing Company | Gulfstream Aerospace Corporation | Short Brothers PLC
Model:
A300 B4-605R | A300 B4-620 | A300 B4-622 | A300 F4-605R | A310-203 | A310-204 | A310-221 | A310-222 ...Show more
Product Type:
Appliance
Product Subtype:
Affected AD:
Superseded AD:
2009-21-10
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
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[Federal Register: January 20, 2010 (Volume 75, Number 12)]


[Rules and Regulations]


[Page 3141-3143]


From the Federal Register Online via GPO Access [wais.access.gpo.gov]


[DOCID:fr20ja10-3]


––––––––––––––––––––––––––––––––––


DEPARTMENT OF TRANSPORTATION


Federal Aviation Administration


14 CFR Part 39


[Docket No. FAA-2010-0029; Directorate Identifier 2009-NM-262-AD; Amendment 39-16179;


AD 2009-21-10 R1]


RIN 2120-AA64


Airworthiness Directives; AVOX Systems and B/E Aerospace Oxygen Cylinder Assemblies, as


Installed on Various Transport Airplanes


AGENCY:
 
Federal Aviation Administration (FAA), Department of Transportation (DOT).


ACTION:
 
Final rule; request for comments.


––––––––––––––––––––––––––––––––––


SUMMARY:
 
The FAA is revising an existing airworthiness directive (AD), which applies to certain


AVOX Systems and B/E Aerospace oxygen cylinder assemblies, as installed on various transport


airplanes. That AD currently requires removing certain oxygen cylinder assemblies from the airplane.


This AD removes certain oxygen cylinder part numbers from the applicability. This AD was


prompted by the reported rupture of a high-pressure gaseous oxygen cylinder, which had insufficient


strength characteristics due to improper heat treatment. We are issuing this AD to prevent an oxygen


cylinder from rupturing, which, depending on the location, could result in structural damage and


rapid decompression of the airplane, damage to adjacent essential flight equipment, deprivation of the


necessary oxygen supply for the flightcrew, and injury to cabin occupants or maintenance or other


support personnel.


DATES:
 
This AD is effective February 4, 2010.


We must receive any comments on this AD by March 8, 2010.


ADDRESSES:
 
You may send comments by any of the following methods:


•
 
Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the instructions for


submitting comments.


•
 
Fax: 202-493-2251.


•
 
Mail: U.S. Department of Transportation, Docket Operations, M-30, West Building Ground


Floor, Room W12-140, 1200 New Jersey Avenue, SE., Washington, DC 20590.


•
 
Hand Delivery: U.S. Department of Transportation, Docket Operations, M-30, West Building


Ground Floor, Room W12-140, 1200 New Jersey Avenue, SE., Washington, DC 20590,


between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays.
2


Examining the AD Docket


You may examine the AD docket on the Internet at http://www.regulations.gov; or in person at


the Docket Management Facility between 9 a.m. and 5 p.m., Monday through Friday, except Federal


holidays. The AD docket contains this AD, the regulatory evaluation, any comments received, and


other information. The street address for the Docket Office (telephone 800-647-5527) is in the


ADDRESSES section. Comments will be available in the AD docket shortly after receipt.


FOR FURTHER INFORMATION CONTACT:
 
Nicholas Wilson, Aerospace Engineer, Cabin


Safety and Environmental Systems Branch, ANM-150S, Seattle Aircraft Certification Office, FAA,


1601 Lind Avenue, SW., Renton, Washington 98057-3356; telephone (425) 917-6476; fax (425) 917-


6590.


SUPPLEMENTARY INFORMATION:


Discussion


On November 25, 2009, we issued AD 2009-21-10, amendment 39-16049 (74 FR 63063,


December 2, 2009). That AD applies to certain AVOX Systems and B/E Aerospace oxygen cylinder


assemblies, as installed on various transport airplanes. That AD requires removing certain oxygen


cylinder assemblies from the airplane. That AD was prompted by the reported rupture of a high-


pressure gaseous oxygen cylinder, which had insufficient strength characteristics due to improper


heat treatment. The actions specified in that AD are intended to prevent an oxygen cylinder from


rupturing, which, depending on the location, could result in structural damage and rapid


decompression of the airplane, damage to adjacent essential flight equipment, deprivation of the


necessary oxygen supply for the flightcrew, and injury to cabin occupants or maintenance or other


support personnel.


Actions Since AD Was Issued


Since we issued AD 2009-21-10, we have been notified that its applicability (in paragraph (c))


erroneously includes oxygen cylinder assemblies having part numbers B43570-3 and B43570-5.


Those oxygen cylinder assemblies are manufactured from composite material, instead of steel, and


the erroneous part numbers do not correspond to any serial numbers listed in the AD. Composite


oxygen tanks are not subject to the identified unsafe condition. These part numbers have been


removed from Table 1 of this AD.


We have also been notified that serial numbers K617383 through K617423 inclusive and


K757064 through K757066 inclusive have been withdrawn from service. These serial numbers have


been removed from Table 3 of this AD.


FAA's Determination and Requirements of This AD


Certain affected airplanes have been approved by the aviation authorities of other countries, and


are approved for operation in the United States.


The unsafe condition described previously is likely to exist or develop in other products of these


same type designs. For this reason, we are issuing this AD to revise AD 2009-21-10. This new AD


retains the requirements of the existing AD, but removes part numbers B43570-3 and B43570-5 from


the applicability of this AD, and removes certain serial numbers from Table 3 of this AD.