lifecycle

lifecycle - AIRCRAFT SYSTEMS ENGINEEERING LIFECYCLE...

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AIRCRAFT SYSTEMS ENGINEEERING LIFECYCLE CONSIDERATIONS Allen C. Haggerty Massachusetts Institute of Technology September 11, 2004
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What is the lifecycle of an Aircraft ? 20 years? 30 years? What is the lifecycle of a typical automobile? ( 10 years? 15 years?) How about a ship? ( aircraft carrier? Battleship “New Jersey” launched in 1943 was used in Viet Nam in 1971 Approx.1500 DC-3 aircraft still flying!
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Weapon System Life Cycles j 0 Notional Pro ected Lifetime Extended Life Years 1946 B-52 KC-135 C-130 CH-47 F-15 F-14 1954 1951 1956 1969 50 60 70 80 90 10 20 30 40 100 2040+ 2030+ 2027+ 2010+ 94+ Years 86+ Years 79+ Years 71+ Years 51+ Years 41+ Years Figure by MIT OCW. CC010050.09
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Boeing 707 / KC-135 and Douglas DC-8 Aircraft designed and produced in the late 1950’s / 1960’s still productive: .KC-135 Tankers refueling fighter aircraft in Afghanistan . DC-8 Freighters are still flying for UPS, Emory Airfreight and others
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Aircraft Service Life Longer than Ships? Rugged Structure: Comprehensive fatigue analysis and testing ( 2 to 3 lifetimes) • Conservative design philosophy for safety • Progressive depot maintenance rigidly enforced ( A-checks, B-checks, C-checks, D-checks) • Designed for ease of inspection EXPENSIVE ASSET NEEDS LONG ECONOMIC LIFE !
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ENGINES • Designed for high reliability and low in-flight shut-down rate (e.g. 2 engine ETOPS 777) •P D M - significant overhaul schedule, but at extended on-wing operational periods ( TBO-16,000 to 20,000 hrs.) Extensive bench, ground and flight testing in development to weed-out premature failures and assure component / sub-system reliability
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QUESTIONS ???? How many of you have driven in a car that has been repainted? How many of you have driven in a car that had an overhauled engine? FACT: Engines of large 40’-50’ Trailer Trucks are completely overhauled every 250,000-300,000 miles IF THE DESIGN PHILOSOPHY IS RIGHT, WE CAN EXTEND THE ECONOMIC LIFE OF COMPLEX SYSTEMS
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AVIONICS AIRFRAME LIFE can last through several generations of avionics / software: C-130A (1954) Analog “boiler gauges”for cockpit displays C-130 (late 1980’s) Evolution to digital avionics C-130 J (1999) Digital flat panel color displays, GPS, GPWS, Terrain Following radar, etc.
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UPGRADES & DERIVATIVES The lifecycle of an aircraft is typically extended by upgrading or conversion: Commercial Military 727 to Combi AH-64 to D DC-10 to MD-10 CH-47A,B,C to D DC-8 PAX to Freighter B-52 to H model 747 PAX to Freighter UH-1 to UH-1H
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DERIVATIVES Planning for “growth” in the original design: Normally, the design staff lays-out a “family”of aircraft that permits downstream /future models in the product family.
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This note was uploaded on 11/08/2011 for the course AERO 16.851 taught by Professor Ldavidmiller during the Fall '03 term at MIT.

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lifecycle - AIRCRAFT SYSTEMS ENGINEEERING LIFECYCLE...

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