2023年5月17日 · The FAA has issued an airworthiness directive for all Boeing Model B-17E, B-17F and B-17G planes after a report indicated that the left front spar lower fitting had separated at the wing-to-fuselage joint and the corresponding joint on the right side was cracked.

2023年5月27日 · The B-17 has a forward and a rear wing spar, and each spar is a truss, consisting of an upper and lower tube, hereby referred to as the "Spar Tubes". The Spar Tubes are square tubes with round corners. The outside dimension of the tube is constant (2.688" or 2 11/16"), while the wall thickness tapers to the other end.

2024年12月20日 · The FAA is expected to issue a mandatory Airworthiness Directive (AD) within the coming weeks to address Boeing B-17 wing mounts. Pre-empting a directive that could ground all B-17s, the Michigan-based Yankee Air Museum temporarily grounded B-17G Yankee Lady on 13 April 2023.

2023年4月15日 · The primary structure of the B-17 inner wing panel consists of two truss-type wing spars, forward and rear. Each truss-type spar is built up from two spar chords, upper and lower, that are assembled with tubular members forming “N” type trusses.

2023年5月25日 · An FAA airworthiness directive has grounded the handful of Boeing B–17 bombers still in operation pending another round of wing spar inspections that one operator expects to complete quickly.

The B-17 has a forward and a rear wing spar, and each spar is a truss, consisting of an upper and lower tube, hereby referred to as the "Spar Tubes". The Spar Tubes are square tubes with round corners. The outside dimension of the tube is constant (2.688" or 2 11/16"), while the wall thickness tapers to the other end.

2023年5月18日 · The much-anticipated airworthiness directive for Boeing B-17s has been released by the FAA. The AD addresses issues with the wing spars.

2023年5月17日 · The much anticipated, overly speculated upon, FAA Airworthiness Directive (AD) for the B-17 wing attach structure was published on Wednesday, May 17, 2023, to become effective on June 1. The published AD will effectively ground the three U.S. based B-17s until required inspections and, possibly, repairs are completed.

The wing construction: spars and highly stressed ribs of the truss type. Corrugated dural sheet, attached to the rib cords, reinforces the skin to withstand compression loads. The B-17F has four 1200 Hp Wright Cyclone Model R-1820-97 engines of the 9-cylinder, radial, air-cooled type with a 16-to-9 gear ratio.

2023年4月25日 · Each wing takes 4 tubes, so 8 tubes per plane. The B-17 has a forward and a rear wing spar, and each spar is a truss, consisting of an upper and lower tube, hereby referred to as the "Spar Tubes". The Spar Tubes are square tubes with round corners.