Thu, Aug 09, 2012
AD NUMBER: 2012-15-13
PRODUCT: All Model 747-100B SUD, 747-300, 747-400, and 747-400D series airplanes; and Model 747-200B series airplanes having a stretched upper deck.
SUBJECT: Airworthiness Directive 2012-15-13
ACTION: Final Rule
SUMMARY: The FAA is uperseding an existing airworthiness directive (AD) for the products listed above. The existing AD currently requires repetitively inspecting for cracking or discrepancies of the fasteners in the tension ties, shear webs, and frames at body stations 1120 through 1220; and related investigative and corrective actions if necessary. That AD requires modifying the frame-to-tension-tie joints at body stations 1120 through 1220 (including related investigative actions and corrective actions if necessary), which provides a terminating action for the repetitive inspections. That AD also requires new repetitive inspections after the modification, corrective actions if necessary, and additional modification requirements at a specified time after the first modification. That AD also removed certain airplanes from the applicability. That AD was prompted by reports of cracked and severed tension ties, broken fasteners, and cracks in the frame, shear web, and shear ties adjacent
to tension ties for the upper deck.
This AD revises the existing AD by adding repetitive open hole high frequency eddy current (HFEC) inspections for cracking in the forward and aft tension tie channels, and repair if necessary. For certain airplanes, this AD also requires a one-time angle inspection to determine if the angle is installed correctly, and re-installation if necessary; and a one-time open hole HFEC inspection at the fastener locations where the tension tie previously attached to the frame prior to certain modifications, and repair if necessary. This AD also, for the Stage 2 inspections, reduces the initial compliance times for those inspections. The FAA is issuing this AD to detect and correct cracking of the tension ties, shear webs, and frames of the upper deck, which could result in rapid decompression and reduced structural integrity of the airplane.
DATES: This AD is effective September 12, 2012.
Also: Evolution Aircraft, Sporty’s/Savvy Breakdown Assistance, Comprehensive Jack Pelton Interview, Part 4 FAA administrator Michael Huerta came to town at EAA AirVenture 201>[...]
Leading Edge Sport Avionics Company Pushes The Envelope For Both Sport and General Aviation Markets! Founded in 2000, Dynon Avionics’ mission is to create the best avionics a>[...]
Pilot Training System Has A Knack For Educating Aviators... Via Innovative Programs Established in 2011, Pilot Training System’s (PTS) online flight-training solution provide>[...]
Sporty's Pilot Shop Is A Pivotal GA Resource! Sporty’s Pilot Shop was founded over 50 years ago by a flight instructor, and ever since has been for pilots and by pilots. Hal >[...]
Trig Excels In Affordable Avionics That Fit YOUR Panel! Trig Avionics are experts in the design and manufacture of compact and innovative certified avionics for light aviation. Our>[...]