Which condition precludes the use of DAAP?

The condition that precludes the use of the Disconnect Autothrottles and Autoland Procedures (DAAP) is when the anti-skid system is inoperative. The anti-skid system is essential for maintaining control of the aircraft during landing, especially on wet or slippery runways. If it is not functioning properly, the risk of skidding during landing increases significantly. This could lead to loss of directional control, which makes it unsafe to utilize DAAP capabilities, as these systems rely on proper wheel braking to effectively manage landing dynamics.

The other conditions, while they can certainly affect safety and operational decisions, do not inherently prevent the use of DAAP. For example, unavailable weather reporting or the presence of obstacles on the runway may require alternative approaches or adjustments but do not specifically disable the automated systems. Similarly, high winds can pose challenges but do not directly render DAAP unusable if the aircraft and conditions otherwise allow for its operation. However, an inoperative anti-skid system directly compromises the reliability and safety of using automated landing features.