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Aviation History
1964
1964 - 0722.PDF
RIGHT International. 19 March 1964 415 TESTING THE BAC ONE-ELEVEN... Fig 4 Static tests on the wing: left, SO per cent deflec- tion; centre, 66.6 per cent deflection; right, 66.6 per cent deflection with flaps lowered Fig 5 The main-undercarriage fatigue and overhaul-life test rig at Weybridge ings" which was completed at the end of 1963, followed by 4,000 retractions in January. An integrated systems rig for the hydraulics and flying controls was built full size, with components in their correct relative positions connected by the right amount of pipes or wiring (Fig 6). The only components omitted from this rig are the flap jacks and the ventral stair. The undercarriage is complete and the air loads on it and on the doors are simulated during operation. All the cockpit equip- ment and instruments are also fitted in the rig. The programme includes component development, fault detection and "lifing." For some of the equipment environmental effects are simulated by heaters and coolers, while cable tensions are varied to simulate thermal effects. The rig was also used to work out the rigging procedure for the controls, to assess servicing and production methods and for the BAC pilots to evaluate the controls before flight. It was also possible to work out on this rig the effect of individual failures upon the effectiveness of the system as a whole. Hydraulic and flying-control units bought from subcontractors are tested to the same standard by the maker as a contractual requirement. For example, the H. M. Hobson tailplane actuator has been plugging along on its 240,000 "flights" since October 1962. Interpolated in the cycle have been heat, cold, ice, dust, salt spray and simulated failures and emergencies. The Hobson feel-unit tests, on similar lines, started over a year ago. The Boulton Paul Aircraft (Dowty Group) rudder power control units, spoiler/airbrake jacks and yaw damper are similarly being tested at Wolverhampton. The flap drive, consisting of the Hobson control unit, trans- mission system and screw jacks, has been running toward its 240,000 "flights" since March 1963. The rig for this has the com- The space-frame systems test rig for the One-Eleven hydraulics and flying controls follows closely the design of that which was so successful in the VCIO development
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