Pressurisation
19.Given the scenario that the expected cruise level of FL310 was selected into the FLT ALT selector during preflight, but subsequently the A/C climbed to FL390, would you expect:
a) A differential pressure of 7.45 psi maintained by the negative pressure relief valve;
b)A differential pressure of 9.1 psi maintained by the positive pressure relief valve;
c)A differential pressure of 8.35 psi maintained by the forward outflow valve;
the ans is b
can anyone please explain this nd the concept of pressurising and depressurising an ac , and examples of situations like these , where u climb higher than expected what would you do , or lower etc
I m asking in terms for the 737Ng , should be the same concept for all aircraft