Airbus Operations GmbH Grant of Exemption No. 10611
This document contains a summary of the agency's decision on a petition for exemption. The purpose of the document is to improve the public's awareness and inform affected operators of the FAA's decision.
Aging Airplane Program: Widespread Fatigue Damage; Correction
The FAA is correcting a technical amendment published May 24, 2012 to a final rule published November 15, 2010. The final rule required design approval holders of certain existing airplanes and all applicants for type certificates of future transport category airplanes to establish a limit of validity of the engineering data that supports the structural maintenance program (hereinafter referred to as LOV). It also required that operators of any affected airplane incorporate the LOV into the maintenance program for that airplane. The technical amendment to the final rule was issued to correct errors, but within its publication, it contained inadvertent errors due to pagination in two tables. This document corrects the errors in those tables.
Airworthiness Directives; Sikorsky Aircraft Corporation (Sikorsky) Model Helicopters
We propose to adopt a new airworthiness directive (AD) for the Sikorsky Model S-70, S-70A, S-70C, S-70C (M), and S-70C (M1) helicopters with General Electric (GE) T700-GE-401C or T700-GE-701C engines installed. This proposed AD is prompted by a reevaluation of the method for determining the life limit for certain GE engine gas generator turbine (GGT) rotor parts and the determination that these life limits need to be based on low cycle fatigue events instead of hours time-in-service. The proposed actions are intended to establish new fatigue life limits for certain GGT rotor parts to prevent fatigue failure of a GGT rotor part, engine failure, and subsequent loss of control of the helicopter.
Airworthiness Directives; Airbus Airplanes
We are revising an earlier proposed airworthiness directive (AD) for certain Airbus Model A330-200, A330-300, A340-200, and A340- 300 series airplanes; and Model A340-541 airplanes and Model A340-642 airplanes. That NPRM proposed to require performing a detailed inspection for degradation of the bogie pivot pins and for any cracks and damage of the pivot pin bushes of the main and central landing gear; a magnetic particle inspection of the affected bogie pivot pins for corrosion and base metal cracks; and repairing or replacing bogie pivot pins and pivot pin bushes, if necessary. That NPRM was prompted by reports of cracks in the bogie pivot pin caused by material heating due to friction between the bogie pivot pin and bush, leading to chrome detachment and chrome dragging on the bogie pivot pin. This action revises that NPRM by adding repetitive inspections and expanding the applicability. We are proposing this AD to detect and correct cracks and damage to the main and central landing gear, which could result in the collapse of the landing gear and adversely affect the airplane's continued safe flight and landing. Since these actions impose an additional burden over that proposed in the NPRM, we are reopening the comment period to allow the public the chance to comment on these proposed changes.
Airworthiness Directives; The Boeing Company Airplanes
We are revising an earlier proposed airworthiness directive (AD) for certain The Boeing Company Model 737-700, -700C, -800, and - 900ER series airplanes, Model 747-400F series airplanes, and Model 767- 200 and -300 series airplanes. That NPRM proposed to require an inspection for affected serial numbers of the crew oxygen mask stowage box units; and replacement of the crew oxygen mask stowage box unit with a new crew oxygen mask stowage unit, if necessary. That NPRM was prompted by reports indicating that certain crew oxygen mask stowage box units were possibly delivered with a burr in the inlet fitting. The burr might break loose during test or operation, and might pose an ignition source or cause an inlet valve to jam. This action revises that NPRM by adding a step to identify and label certain crew oxygen mask stowage box units that have already been inspected and reworked by the supplier, and allowing operators to install new or serviceable crew oxygen mask stowage box units. We are proposing this supplemental NPRM to prevent an ignition source, which could result in an oxygen-fed fire; or an inlet valve jam in a crew oxygen mask stowage box unit, which could result in restricted flow of oxygen. Since these actions impose an additional burden over that proposed in the NPRM, we are reopening the comment period to allow the public the chance to comment on these proposed changes.
Explosive Siting Requirements
This rule amends the requirements for siting explosives under a license to operate a launch site. It increases flexibility for launch site operators in site planning for the storage and handling of energetic liquids and explosives.