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Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270082
EISBN: 978-1-62708-301-0
... Abstract This chapter discusses the investigation of a helicopter tail rotor blade that fractured during a test flight. It includes images of the damaged blade along with close-ups of both sides of the blade tip showing that the tip tore off at the rivets. Based on their observations...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270107
EISBN: 978-1-62708-301-0
... Abstract A helicopter lost the outboard rib on a tail rotor blade in flight and was forced to land because of the resulting vibrations. The investigation that followed is described in this chapter along with key findings. As shown in a sketch, the rib is held in place by a set of six rivets...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270110
EISBN: 978-1-62708-301-0
... Abstract Helicopter control mechanisms were failing at a higher than normal rate on high-altitude flights in mountainous regions. All of the failures occurred at or near attachment points on pressurized tubes, causing a pressure drop and partial loss of function. Visual and SEM examinations...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270154
EISBN: 978-1-62708-301-0
... Abstract The aluminum alloy skin on the main rotor blade of a helicopter tore off in flight, and an investigation was subsequently conducted to find the cause. Visual examination and SEM fractography revealed that a fatigue crack originated on the underside of a rivet hole at the trailing edge...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270156
EISBN: 978-1-62708-301-0
... Abstract The tail rotor blade of a helicopter developed a visible crack during service. The cracked region was removed from the blade and the fracture surface was examined in a SEM, revealing shallow pitting on the inside surface of the skin and a corresponding reduction in thickness. Based on...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270162
EISBN: 978-1-62708-301-0
... Abstract Several components from the tail boom of a helicopter were found fractured at a crash site, including gusset plates, the hat section near the lower yoke, and a cable that controls the pitch of the tail rotor. The components were recovered from the wreckage and taken to a lab for closer...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270063
EISBN: 978-1-62708-301-0
... presented include components and accessories of aircraft, helicopters, compressors, turbines, fuel pumps and other parts of aircraft engines, ground equipment, power plants, and chemical plants. The investigation of the failure of dowel bolts in an aircraft engine was carried out jointly with scientists...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.tb.hpcspa.t54460277
EISBN: 978-1-62708-285-3
...://www.moog.com/literature 11.5 Leyman P.F. and Champagne V.K. , “ Cold Spray Process Development for the Reclamation of the Apache Helicopter ,” ARL-TR-4922, Army Research Laboratory, Aug 2009 11.6 Villafuerte J. and Wright D. , Aircraft Part Restoration via Cold Spray...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780001
EISBN: 978-1-62708-268-6
.... Aerospace engineers designed the Apache helicopter blade (a bonded stainless steel, carbon fiber, and titanium structure) to withstand a direct hit from high-explosive enemy projectiles. During combat operations over Iraq, an Apache helicopter blade actually took a direct hit from a Russian-designed ZSU-23...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.tb.hpcspa.t54460227
EISBN: 978-1-62708-285-3
... trade study reported an annual cost for H-60 main gearbox corrosion of $10.8 million to the Navy and $6.7 million to the Army, for a total of approximately $17.5 million for 600 helicopters. Conventional repair processes such as welding, plating, or patching with composite material often either...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780147
EISBN: 978-1-62708-268-6
... performance at tolerance extremes. Chapter 1 mentions the Apache helicopter main rotor blade failures. McDonnell Douglas Helicopter Company engineers designed the Apache helicopter blade (a bonded stainless steel, carbon fiber, and titanium structure) to withstand a direct hit from high-explosive enemy...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270031
EISBN: 978-1-62708-301-0
... H.M. , Helicopter Failure Modes and Corrective Actions , Proceedings 1975 Annual Reliability and Maintainability Symposium , Jan 28–30, 1975 ( Washington, D.C. ), p 504 33. Roberge P.R. , Tullmin M.A.A. , Trethewey K.R. , Failure Analysis by Case-Based Reasoning , http...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.ttg2.t61120005
EISBN: 978-1-62708-269-3
... 19,400 CH-60/(2) T-700 2,041 4,500 S-76/(2) A11.250 544 1,200 AH-64/(2) T-700 635 1,400 (a) Typical uses are A-10 ballistic armament; structural forgings and wing skins for F-14 and F-15 aircraft; rotor parts for helicopter blade systems; B-1B fracture-critical forgings and wing...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.ttg2.t61120039
EISBN: 978-1-62708-269-3
... can be evaluated in a fraction of the time needed and at a very small fraction of the cost for producing a part using conventional wrought processing techniques. Rapid prototyping using computer-aided modeling was claimed to cut over 50% from the development time for a complex casting for a helicopter...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2012
DOI: 10.31399/asm.tb.lmub.t53550001
EISBN: 978-1-62708-307-2
... damping capacity, and castings have found application in high-vibration environments, such as helicopter gear boxes. Magnesium alloys are used in aerospace applications, high-speed machinery, and transportation and materials handling equipment. Although wrought and cast alloys are available, cast alloys...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030117
EISBN: 978-1-62708-282-2
... of surfaces and may involve a cavitation mechanism. Two areas are most notable for water drop impingement: steam turbines and helicopter rotor blades. In turbines, condensation of steam produces droplets that are carried into the rotor blades, with consequent surface damage. Raindrop erosion on...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870001
EISBN: 978-1-62708-314-0
... performance and payload reasons, and composites often approach 20 to 40 percent of the airframe weight ( Fig. 1.25 ). For decades, helicopters have incorporated glass fiber–reinforced rotor blades for improved fatigue resistance, and in recent years helicopter airframes have been built largely of carbon-fiber...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.ttg2.t61120289
EISBN: 978-1-62708-269-3
..., military, and business aircraft, helicopters, aircraft engines, missiles, spacecraft, materials, and related components and equipment. As part of the AIA, the Aerospace Technical Council, Technical Specifications Division, directs the National Aerospace Standards Committee. Issues various aerospace-related...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.sap.t53000001
EISBN: 978-1-62708-313-3
... chromium levels, which prompted a reduction of chromium levels in superalloys from approximately 20 to 10 weight percent. The reduction in chromium made the alloys vulnerable to hot corrosion, which was painfully evident in helicopter engines ingesting sea spray during the Vietnam War. Although chromium...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.t51180061
EISBN: 978-1-62708-256-3
... References 1. Air Safety Online, aviation accident database , www.crashdatabase.com (Web site accessed December 2004) 2. Helicopter Crashes, Willis & Associates , www.helicopter-crashes.com (Web site accessed March 2005) Statistics are an important part of a failure investigation...