Select Committee on Chinook ZD 576 Written Evidence


Annex A

Extract from fax from AAIB to Air Safety Investigation Manager, Boeing Helicopters

  I apologise for the delay of the information required for the simulation, occasioned by AAIB bureaucracy; it is as follows:
All up Weight17,100 kg
Centre of GravityMid Point of Allowable Range
Mean Sea Level Ambient Pressure998 mb
Sea Level Ambient Temperature+9ºC
Sea Level Dew Point Temperature+9ºC
Initial Impact Point Altitude800 ft amsl
Estimated Wind near Initial Impact Point 170ºT/30 kt (considerable uncertainty)
Track at Initial Impact025ºT
Estimated Pitch Attitude at Initial Impact 30º Nose Up
Estimated Flight Path at Initial Impact 20º above the horizontal
Assumed point of DASH and LCTA
  Power Supply LossAt Initial Impact


  While the estimated pitch attitude and flight path are given above, this is not intended to alter the proposed "steady attitude" conditions, ie 20, 30 and 40º pitch, or to stop the data at 20º climb. The Board considers that the information to be provided by the simulator runs proposed by John Kannon are likely to be of considerable value to the investigation. They have requested a number of initial conditions for the proposed series of runs:
Indicated Airspeed135 and 150 KIAS
Rate of Climb0, 500 and 1000 ft/min


  It is appreciated that this may impose a factor of six on the number of runs, but hopefully indications from initial runs will preclude a sizeable number of combinations of initial conditions and make the number of cases to be handled manageable.

A N Cable

Senior Inspector of Air Accidents, for Chief Inspector of Air Accidents

15 August 1994


 
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