AD 2007-07-05 R1

AD Final Rules - 2007-07-05 R1.pdf
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AD Number:
2007-07-05 R1
Document Type:
AD Final Rules
Docket Number:
FAA-2007-27898
Subject Heading:
Airworthiness Directives; Boeing Model 777 Airplanes
Subject:
Left and right air supply and cabin pressure controllers (ASCPCs)
Status:
Current
Citation:
(Federal Register: April 18, 2007 (Volume 72, Number 74))
Citation Publish Date:
04/18/2007
Effective Date:
04/18/2007
Make:
The Boeing Company
Model:
777-200 Series | 777-200LR Series | 777-300 Series | 777-300ER Series
Product Type:
Aircraft
Product Subtype:
Large Airplane
Affected AD:
Superseded AD:
2007-07-05
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
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[Rules and Regulations]


[Page 19380-19382]


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


[DOCID:fr18ap07-2]


––––––––––––––––––––––––––––––––––


DEPARTMENT OF TRANSPORTATION


Federal Aviation Administration


14 CFR Part 39


[Docket No. FAA-2007-27898; Directorate Identifier 2007-NM-078-AD; Amendment 39-15029;


AD 2007-07-05 R1]


RIN 2120-AA64


Airworthiness Directives; Boeing Model 777 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 all


Boeing Model 777 airplanes. That AD currently requires a one-time inspection to determine the part


number of the left and right air supply and cabin pressure controllers (ASCPCs), and installation of


new ASCPC software if necessary. This AD requires those same actions. This AD also revises the


existing AD to allow installation of an ASCPC with additional versions of software installed and to


correct a part number reference. This AD results from a report of an ASCPC failure during flight. We


are issuing this AD to prevent an ASCPC failure that could stop airflow into the airplane, inhibit the


cabin altitude warning message, and cause an incorrect display of cabin altitude. These failures could


result in depressurization of the airplane without warning.


DATES:
 
The effective date of this AD is April 18, 2007.


On April 18, 2007 (72 FR 15820, April 3, 2007), the Director of the Federal Register approved


the incorporation by reference of Boeing Service Bulletin 777-36A0026, Revision 1, dated February


8, 2007.


We must receive any comments on this AD by June 18, 2007.


ADDRESSES:
 
Use one of the following addresses to submit comments on this AD:


•
 
DOT Docket Web site: Go to http://dms.dot.gov and follow the instructions for sending your


comments electronically.


•
 
Government-wide rulemaking Web site: Go to http://www.regulations.gov and follow the


instructions for sending your comments electronically.


•
 
Mail: Docket Management Facility; U.S. Department of Transportation, 400 Seventh Street,


SW., Nassif Building, Room PL-401, Washington, DC 20590.


•
 
Fax: (202) 493-2251.
2


•
 
Hand Delivery: Room PL-401 on the plaza level of the Nassif Building, 400 Seventh Street,


SW., Washington, DC, between 9 a.m. and 5 p.m., Monday through Friday, except Federal


holidays.


Contact Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124-2207, for


service information identified in this AD.


FOR FURTHER INFORMATION CONTACT:
 
David Webber, Aerospace Engineer, Cabin


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


1601 Lind Avenue, SW., Renton, Washington 98057-3356; telephone (425) 917-6451; fax (425) 917-


6590.


SUPPLEMENTARY INFORMATION:


Discussion


On March 21, 2007, we issued AD 2007-07-05, amendment 39-15010 (72 FR 15820, April 3,


2007). That AD applies to all Boeing Model 777 airplanes. That AD requires a one-time inspection to


determine the part number of the left and right air supply and cabin pressure controllers (ASCPCs),


and installation of new ASCPC software if necessary. That AD resulted from a report of an ASCPC


failure during flight. The actions specified in that AD are intended to prevent an ASCPC failure that


could stop airflow into the airplane, inhibit the cabin altitude warning message, and cause an


incorrect display of cabin altitude. These failures could result in depressurization of the airplane


without warning.


Actions Since AD Was Issued


Since we issued that AD, we have determined that additional versions of the ASCPC software


should be permitted. In paragraph (i) of that AD (“Installation of Certain OPS Software Prohibited”),


we cited a specific part number of operational program software (OPS) that must be installed in


ASCPCs before they can be installed on any airplane as of the effective date of that AD. By citing


that specific part number, we inadvertently prohibited use of later, acceptable versions of the OPS.


This was not our intent.


We have also determined that, in that same paragraph, there is a typographical error resulting in


an incorrect ASCPC part number.


FAA's Determination and Requirements of This AD


The unsafe condition described previously is likely to exist or develop on other airplanes of the


same type design. For this reason, we are issuing this AD to revise AD 2007-07-05. This new AD


retains the requirements of the existing AD. This AD also revises the existing AD to allow


installation of an ASCPC with additional versions of software installed and to correct a part number


reference.


FAA's Determination of the Effective Date


An unsafe condition exists that requires the immediate adoption of this AD; therefore, providing


notice and opportunity for public comment before the AD is issued is impracticable, and good cause


exists to make this AD effective in less than 30 days.