Federal Aviation Administration December 6, 2011 – Federal Register Recent Federal Regulation Documents
Results 1 - 4 of 4
Airworthiness Directives; The Boeing Company Airplanes
We propose to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 777 airplanes. This proposed AD was prompted by reports of corrosion damage on the outer diameter chrome surface of the horizontal stabilizer pivot pins. Micro cracks in the chrome plating of the pivot pin, some of which extended into the base metal, were also reported. This condition, if not corrected, could result in a fractured horizontal stabilizer pivot pin, which may cause excessive horizontal stabilizer freeplay and structural damage significant enough to result in loss of control of the airplane. This proposed AD would require replacing the existing horizontal stabilizer pivot pins with new or reworked pivot pins having improved corrosion resistance, doing repetitive inspections after installing the pivot pins, and doing corrective actions if necessary. We are proposing this AD to correct the unsafe condition on these products.
Airworthiness Directives; Eurocopter Deutschland GmbH Helicopters
We propose to adopt a new airworthiness directive (AD) for Eurocopter Deutschland GmbH Model BO-105A, BO-105C, BO-105LS A-1, BO- 105LS A-3, and BO-105S helicopters. This proposed AD would require inspecting certain main rotor blades for debonding of the erosion protective shell. If the erosion protective shell is debonded, you would be required to replace the main rotor blade with an airworthy main rotor blade. This proposed AD is prompted by the results of an inspection on a BO-105 helicopter where debonding was discovered on a main rotor blade erosion protective shell, and it was determined that the debonding was due to incorrect installation of the erosion protective shell. Subsequently, an incident occurred where a BO-105 helicopter lost its main rotor blade erosion protective shell during flight. The actions specified by this proposed AD are intended to detect debonding of the main rotor blade erosion protective shell which could lead to an unbalanced main rotor, high vibrations, damage to the tail boom or tail rotor, and loss of control of the helicopter.
Proposed Modification of Area Navigation Route T-288; WY
This action proposes to modify low altitude area navigation (RNAV) route T-288 by extending the route westward from the Rapid City, SD, VORTAC to the Gillette, WY, VOR/DME. The proposed extension would enhance efficiency and safety of the National Airspace System (NAS) by supplementing the existing VOR Federal airway structure in that area.
Airworthiness Directives; Pratt & Whitney Division (PW) PW4000 Series Turbofan Engines
We are adopting a new airworthiness directive (AD) for certain PW4000 turbofan engines. This AD was prompted by an updated low-cycle fatigue (LCF) life analysis performed by PW. This AD requires removing certain part number (P/N) high-pressure turbine (HPT) stage 1 and HPT stage 2 airseals and HPT stage 1 airseal rings before their published life limit and establishes a new lower life limit for these parts. We are issuing this AD to prevent failure of these parts, which could lead to an uncontained engine failure and damage to the airplane.
This site is protected by reCAPTCHA and the Google
Privacy Policy and
Terms of Service apply.
