Hi,
Little more ...
jcjeant
Aircraft certification in Europe (CS25), which says in paragraph 1309 :
Quote:
CS 25.207 Stall warning
(c) Once initiated, stall warning must continue until the angle of attack is reduced to approximately that at which stall warning began.
What about Airbus A330 ?
HazelNuts39
The quote first refers to CS25.1309 and then copies a subparagraph of CS25.207. Both requirements have been referenced and discussed more than once on the various parts of the AF447 thread. I'm not an expert on the certification of the A330, but I recall that the certification basis contains an exception (SC or ESF or IP, I don't recall) that may relate to paragraph 25.207. First of all, it must be understood that 25.207 and most other requirements of CS25 Subpart B 'Flight' must be met with all airplane systems and equipment functioning as designed. Failure conditions, such as reversion to alternate law, are considered under paragraph 25.1309 on the basis of their probability of occurrence and their effect on the safety of continued flight and landing. In normal law, the A330 does not have stall warning as intended by CS25.207. I presume that requirement has been waived in consideration of the high-angle-of-attack protection in normal law.
AMC 25.1309 System Design and Analysis
4. APPLICABILITY OF CS 25.1309
a. While CS 25.1309 does not apply to the performance and flight characteristics of Subpart B and structural requirements of Subparts C and D, it does apply to any system on which compliance with any of those requirements is based. For example, it does not apply to an aeroplane's inherent stall characteristics or their evaluation, but it does apply to a stall warning system used to enable compliance with CS 25.207.