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Aviation History
1964
1964 - 2315.PDF
322 FOKKER F.28 . . . Cockpit and Flight Systems The Fellowship has been designed from the outset for two-crew operation. With such a wide cockpit and relatively few and simple systems, this should give Fokker every opportunity for designing a very good layout. Though not immediately intended for full blind-landing oper- ations when it goes into service, the Fellowship is intended to be fully capable of operating to the requirements of ICAO Phase 2 (100ft and quarter-mile). Fokker say that after careful evaluation of various proposals it was finally decided that the Smiths SEP6 single-channel automatic flight control system best suited the requirements laid down for the aircraft. Moreover, it was considered an important factor that Smiths have obtained a wealth of experi- ence through their association with the Blind Landing Unit of the RAE. Fokker and Smiths are working on eventual integration of such features as autothrottle, radar altimeter, PVD, flare computer and go-around system for operation at low weather minima, as well as the incorporation of a flight director system with the autopilot. Production An important aspect in the process planning of every project is the number of units to be produced per month. For the F.28 the production rate was fixed at four aircraft per month, with the additional condition that this rate must be possible in double- shift operation. Moreover, it was imperative to avoid the duplication of ass- embly jigs. In other words, the amount of work to be carried out in each assembly jig has been selected in such a way, that the component can be taken out of the jig after one week, the same jig being used immediately afterwards for the next aircraft. Several reasons make such careful planning fundamental to the FLIGHT International, 27 Amgmst LpAYLOAD CONDITIONS: CRUISE AT 25.000 fT JMAX. RECOMM. CRUISE) TEMP: ISA ZERO WIND • FUEL RESERVE—2 MRS HOLDING AT 15.000 FT • FUEL RESERVE- MAX. 230 MILES ALTERNATE 30 MIN HOLDING AT 1.500 KT 10% OF FLIGHT FUbL I • FUEL RESERVE—I 1 MAX. 2M MILES ALTERNATE 45 MIN HOLDING AT 5.000 KT J% ON TOTAL FUEL ) _J I I I 200 400 600 800 1,000 1,200 I,«X* RANGE-ST. MILES An exploded view to show how Fokker has broken down the F.28 structure into manageable units to meet forecast production requirements The payloadlrange performance of the Fellowship based on three different reserve fuel assumptions economic production by such a relatively small manufacturer. First of all, the greatest efficiency will undoubtedly be obtained if the work in the production line is carried out in unduplicated stages for the entire series production: the best learning curve is thus obtained, adherence to schedule is better and so on. Secondly, an assembly jig becomes more and more complicated as the amount of work to be carried out in it increases. By splitting up the work, the number of different jigs will increase, but each of the jigs will be simpler in construction, and have better accessibility. For planning the production methods and tooling design for the Fellowship, a break-even figure of 125 aircraft has been assumed. Since production deliveries are being planned to follow only IS months after the Fellowship first flies, the first aircraft will be built using production jigs and tooling. Fokker are confident that the conventional nature of the design and their previous ex- perience of the construction techniques^used fully justifies this step.
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