Airworthiness Directives; Bombardier Inc. Airplanes
AI-generated summary for informational purposes only. Not legal advice. See the original source for the authoritative text.
The FAA has issued a new Airworthiness Directive (AD 2026-07-01) effective May 8, 2026, for all Bombardier Challenger 600, 601, and 604/605/650 variant aircraft. The directive addresses uncommanded nose wheel steering caused by loose setscrews in the rudder pedal potentiometer universal coupling. Operators must replace the existing setscrews with self-locking setscrews using anaerobic retaining compound and specified torque within 36 months or 1,400 flight hours, whichever comes first. Additionally, the maintenance program must be revised to incorporate new life limits for these setscrews. This AD was prompted by an in-service incident where an aircraft veered off centerline after landing despite standard procedures.
AI-generated summary. May contain errors. Refer to official sources for legal decisions.
Key Changes
- Replace nosewheel steering rudder pedal potentiometer universal coupling setscrews within 36 months or 1,400 flight hours after May 8, 2026
- Install self-locking setscrews with anaerobic retaining compound and specified torque per service bulletins
- Revise aircraft maintenance or inspection program to include new life limits for the setscrews
+ 3 more changes with Pro
Obligations
What this law requires
Replace nosewheel steering rudder pedal potentiometer universal coupling setscrews with self-locking setscrews using anaerobic retaining compound and specified torque within 36 months or 1,400 flight hours, whichever comes first
Revise the existing maintenance or inspection program to incorporate new life limits for the nosewheel steering rudder pedal potentiometer universal coupling setscrews
Incorporate information from the applicable Temporary Revision (TR) of the Time Limits/Maintenance Checks (TLMC) documents specified in the AD (CL600 TLMC TR 5-165, CL601 TLMC TR 5-269, or CL601A TLMC TR 5-283, or later revisions containing the same information)
Follow procedures outlined in the applicable Bombardier Service Bulletin (SB 600-0782, SB 601-1114, SB 604-32-033, SB 605-32-010, or SB 650-32-007, all dated October 30, 2023) when replacing setscrews and rigging the potentiometer
Comply with AD 2026-07-01 effective May 8, 2026