In which situation are ALT flaps needed?

ALT flaps, or alternate flaps, are employed in scenarios where the primary hydraulic system fails or is unable to function as expected. This situation typically arises during a loss of right hydraulic pressure, where the normal flap operation may be compromised. Therefore, using ALT flaps allows pilots to still manage flap deployment, ensuring that they can maintain control of the aircraft and achieve a safe landing or approach.

Other situations mentioned, such as climbing, landing in strong winds, or taking off in low visibility conditions, do not inherently require the use of ALT flaps, as these do not involve a failure of the primary hydraulic system. Instead, normal flap operations would generally suffice in these scenarios. The design of the flap systems ensures that the need for alternate operation is specifically tied to hydraulic system failures, underlining why the correct response relates to situations involving hydraulic pressure loss or procedural directives.