Consider the following four statements regarding aircraft longitudinal stability:
P. $C_{M, c g}$ at zero lift must be positive
Q. $\partial C_{M, c g} / \partial \alpha_{a}$ must be negative $\left(\alpha_{a}\right.$ is absolute angle of attack)
R. $C_{M, c g}$ at zero lift must be negative
S. Slope of $C_{L}$ versus $\alpha_{a}$ must be negative
Which of the following combination is the necessary criterion for stick fixed longitudinal balance and static stability?
(A) $Q$ and $R$ only
(B) $Q, R,$ and $\mathrm{S}$ only
(C) $\mathrm{P}$ and $\mathrm{Q}$ only
(D) $\mathrm{Q}$ and $\mathrm{S}$ only

Question ID - 155937 :-

Consider the following four statements regarding aircraft longitudinal stability:
P. $C_{M, c g}$ at zero lift must be positive
Q. $\partial C_{M, c g} / \partial \alpha_{a}$ must be negative $\left(\alpha_{a}\right.$ is absolute angle of attack)
R. $C_{M, c g}$ at zero lift must be negative
S. Slope of $C_{L}$ versus $\alpha_{a}$ must be negative
Which of the following combination is the necessary criterion for stick fixed longitudinal balance and static stability?
(A) $Q$ and $R$ only
(B) $Q, R,$ and $\mathrm{S}$ only
(C) $\mathrm{P}$ and $\mathrm{Q}$ only
(D) $\mathrm{Q}$ and $\mathrm{S}$ only

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