Federal Aviation Administration February 27, 2012 – Federal Register Recent Federal Regulation Documents
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Security Considerations for Lavatory Oxygen Systems
On March 8, 2011, the FAA published an interim final rule, request for comments (Amendment Nos. 21-94, 25-133, 121-354, 129-50; SFAR 111) on security considerations for lavatory oxygen systems (77 FR 12550). The interim final rule addresses a security vulnerability and is needed so the affected airplanes can continue operating until the non- compliance to airworthiness standards and operating rules is resolved. We sought public comment on the interim final rule even though it became effective upon publication. This action responds to the public comments the FAA received.
Executive Committee of the Aviation Rulemaking Advisory Committee; Meeting
The FAA is issuing this notice to advise the public of a meeting of the Executive Committee of the Aviation Rulemaking Advisory Committee.
Airworthiness Directives; Pratt & Whitney Canada, Auxiliary Power Units
We propose to adopt a new airworthiness directive (AD) for certain serial numbers of Pratt & Whitney Canada (P&WC) PW901A auxiliary power units (APUs) approved under Technical Standard Order TSO-C77A and installed on, but not limited to, Boeing 747-400 series airplanes. This proposed AD was prompted by several events of high- pressure turbine blade fracture leading to separation of the rear gas generator case and release of high energy debris. This proposed AD would require modifications of the rear gas generator case, exhaust duct support, and turbine exhaust duct flanges. We are proposing this AD to prevent separation of the rear gas generator case and release of high energy debris, which could result in injury and damage to the airplane.
Airworthiness Directives; The Boeing Company Airplanes
We propose to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes. This proposed AD was prompted by reports from the manufacturer that center overhead stowage (COS) boxes could fall from their supports under forward load levels less than the 9G forward load requirements as defined by Federal Aviation Regulations. This proposed AD would require modifying COS boxes by installing new brackets, stiffeners, and hardware as needed. We are proposing this AD to prevent detachment of COS boxes at forward load levels less than 9G during an emergency landing, which would cause injury to passengers and/or crew and could impede subsequent rapid evacuation.
Airworthiness Directives; Various Transport Category Airplanes
We propose to supersede an existing airworthiness directive (AD) that applies to certain transport category airplanes. The existing AD currently requires either activating all chemical oxygen generators in the lavatories until the generator oxygen supply is expended, or removing the oxygen generator(s); and, for each chemical oxygen generator, after the generator is expended (or removed), removing or restowing the oxygen masks and closing the mask dispenser door. Since we issued that AD, we have identified means to provide a supplemental oxygen system that does not have the unsafe condition. This proposed AD would require installing a supplemental oxygen system in affected lavatories, which would terminate the requirements of the existing AD. We are proposing this AD to eliminate a hazard that could jeopardize flight safety, and to ensure that all lavatories have a supplemental oxygen supply.
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