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Aviation History
1975
1975 - 0914.PDF
820 FLIGHT International, 22 May 197S 10 M 12 KEY Structure and accommodation 1 Forward pressure bulkhead 2 Standard three-crew flight deck (two supernumerary seats) 3 Crew entry door (48in x 24in) 4 Upper-deck toilet 5 Baggage and coat stowage (pro vision for galley) 6 Upper-deck cabin (16 seats shown) 7 Rear galley with provision for service lift (optional) Passenger entry door, plug type (76in x 42in), one of eight Spiral staircase to upper cabin and flight deck First-class lounge (28 seats) Forward galley (offset to right) Forward cargo hold, 1,730 cu ft (10 containers shown) Additional stiffeners and sound proofing added to upper lobe Modified front wing spar/fuselage frame Overwing fuselage structure similar to existing aircraft Potable water tanks (three with 70gal capacity each, space for two additional tanks) Toilets (four) Nine-abreast economy-class cabin Overhead luggage bins (pull down) Service panel Aft galley unit Rear underfloor cargo hold, 1,730 cu ft (400 cu ft additional space) Rear pressure dome Extended fin tip (60in) Redesigned tail section (rotated up 1°) Lowered fin base (38in) Fin torque box strengthened to absorb extra rudder loads New tailplane tips (60in) Modified centre wing box, front- section water/methanol, rear four sections sealed for fuel Wing essentially 747-100/200B, but weight decreased throughout Air conditioning AI Delivery air from APU to conditioning packs A2 Air-conditioning packs (total three) C2 C3 C4 C5 C6 C7 C8 C9 (hy Controls CI Two-piece double-hinged rud der Dual control unit (hydraulically actuated) Tab link Tailplane incidence actuator (2° additional leading-edge up travel) Tailplane pivot point Split elevator Elevator control unit draulically actuated) Variable-camber flaps \ Fixed-camber flaps J pneumatically actuated trie back-up Spoiler panels actuated by individual hydraulic units (in flight speed-brake position reduced from 45° to 30°) Single-slotted variable-pivot flap Rotary actuators (hydraulically driven) Four-bar linkage Inboard flap hinged panel (eliminates buffet) Flap cross-over torque drive- shaft (hydraulically driven with electric back-up) Inboard aileron (hydraulically actuated) Outboard aileron (hydraulically actuated) Control-cable run along top of fuselage Fuel system Fl Inboard main tank (20,300 Imp gal) Outboard main tank (7,000 Imp gal) Outboard reserve tank (830 Imp gal) Modified outboard dry bay tank Vent surge tank Centre wing tank (10,700 Imp gal) The 747SP, shown in this presentation by "Flight" artist John Marsden, is more than just a cut-back 747-100. The fin and tailplane have been extended, the flaps simplified and empty weight reduced by 42,0001b. Several internal arrangements are possible,providing mixed-class seating for between 281 passengers at nine-abreast and 305 at ten-abreastt or single-class economy seating for up to 390 passengers. If a main deck baggage compartment is used, the full 3t860 cu ft of the lower hold can be used for cargo. A unique feature of the 747SP is the offset longitudinal galley CI3 CI4 A3 Duct from engines, tapped from 8th and 15th stages A4 Heat exchanger A5 Conditioned-air plenum cham ber A6 Riser ducts to cabin zones (both sides) A7 Flexible ducts to individual louvres A8 Insulated cabin walls A9 Duct to upper cabin and flight deck AI0 Pressure-relief valves (two) All Outflow valves (two) AI2 Pneumatic duct to engine thrust-reverser AI3 Hot-air delivery duct and spray tube (wing anti-icing) F7 hU F9 FI0 Fll FI2 FI3 FI4 FI5 Flo Pressure fuelling/defuelling couplings (two per wing) Overwing filler points (one per wing) Override transfer pumps Two AC-d riven boost pumps per main tank Jettison/fuelling/defuelling manifold Jettison nozzle Contents probes (total 63 per aircraft) Vent manifold (also in skin stringers) Vent outlet (NACA duct under- wing) Fuel feed/crossfeed manifold linking all engines Pow PI P2 P3 P4 PS P« P7 PS P9 PI0 Pll PII PI3 Powerplant and APU •" Pratt & Whitney JT9D-7A/7F high-bypass two-spool turbofan Front engine mounting Rear engine mounting and yoke Upper pylon support Diagonal brace "Fixed-lip" cowl Acoustically treated fan exhaust Fan reverser only New fixed sleeve Engine access doors Pneumatically driven thrust- reverser actuator Garrett APU APU air inlet PI4 Cooling-air iniet to accessories PIS Ejector-cooled exhaust duct Hydraulics, electrics & emergency equipment HI Engine-driven hydraulic pumps (four independent systems, one per engine) H2 Air-driven pump (back-up for each system) H3 System reservoir (one per system) H4 One 60kVA alternator per engine H5 One 60kVA alternator on APU, 90kVA when APU-driven
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