Final answer:
The extension of the AIP on front bulkhead tubes is specific to engineering standards and safety regulations and cannot be accurately given without more context. It is important for the integrity of the joint and must be determined according to professional guidelines.
Step-by-step explanation:
The question refers to bolted joints in an engineering context, likely within the scope of mechanical engineering or a related field focusing on the assembly of structural elements. In engineering, the 'AIP' could be understood as the Anti-Icing Panel or some other specific terminology depending on the precise context, which is unclear here. The requirement for how far the AIP must extend on front bulkhead tubes could vary depending on the design standards or regulations applicable to the particular project or jurisdiction. Typically, detailed design specifications such as these are guided by engineering principles and safety regulations to ensure proper joint strength and function.
It's critical for the integrity of the joint that the AIP covers an adequate surface area of the front bulkhead tubes to ensure that the structure can withstand operational stresses, including environmental conditions for anti-icing purposes, if that is what 'AIP' refers to. Without specific engineering standards or mechanical design references, it's not possible to provide a generic measurement. It would be advisable to consult the relevant design documents, safety standards, or engineering guidelines for the precise information required.