Discussion
Arrange these events as a transport aeroplane accelerates into the transonic range:
1. Local supersonic flow appears over the wing
2. Shock waves form and the aerodynamic centre moves aft
3. A nose down pitching moment develops
4. The Mach trim system applies compensating nose up trim
5. Speed stability is preserved and the tendency does not develop
Select the correct sequence.
Answer: B
Without the compensating trim the aeroplane would tend to accelerate further as it tucked, reversing its speed stability. Sensing Mach number and applying trim automatically prevents the sequence from ever reaching the pilot.
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