Piper Pilot 100i — Service Bulletins

Service Bulletin No. 1423A addresses the inspection of the wing aft spar-to-fuselage attachment hardware for the Piper Pilot 100i and other affected models. This bulletin supersedes previous service letters and bulletins, ensuring compliance with updated instructions and serial number specifications. The purpose of this bulletin is to prevent the loosening of attachment bolts, which has been reported in some aircraft. Compliance with this bulletin is mandatory and should coincide with the next scheduled maintenance event, not exceeding 100 hours of time in service. The document provides detailed inspection procedures, torque specifications, and necessary actions based on the inspection results.

• Initial compliance with the inspection must occur within 100 hours of service.
• 5/16 inch bolts require a minimum off-torque of 100–115 in-lbs; 3/8 inch bolts require 180–195 in-lbs.
• Replacement hardware specifications are provided in Chart 1 of the bulletin.
• Inspection must be performed with the aircraft on weight (not on jacks).
• Document compliance in the aircraft logbook after inspection.