FAA Mandates Helicopter Mast Inspections
Published Date: 6/9/2026
Rule
Summary
If you own or operate a Hélicoptères Guimbal Cabri G2 helicopter, listen up! The FAA found cracks on the main rotor mast after some shaky flights, so they’re requiring inspections, fixes, and upgrades to keep things safe. These rules kick in June 24, 2026, and could mean some repair costs, but safety first!
Analyzed Economic Effects
5 provisions identified: 0 benefits, 5 costs, 0 mixed.
Mandatory MR Mast Inspections Now Required
If you own or operate a Hélicoptères Guimbal Cabri G2 helicopter, you must inspect the main rotor (MR) mast for cracks and corrosion using 10X magnification within the AD compliance times. Compliance times vary by group: Group 1 may need inspection before further flight or within 3 months/150 hours (or before 2 years from original certificate), Group 2 within 3 months/150 hours or before exceeding 9 months/150 hours since last MGB work, and Group 3 within 3 months or within 150 hours; any new vibration must be inspected before further flight. The AD is effective June 24, 2026.
Potential High Repair/Overhaul Costs for MR Mast
If inspections reveal defects or cracks that remain after paint removal, the MR mast must be removed from service and repaired using an FAA-, EASA-, or DOA-approved method. The FAA notes manufacturer guidance that an MR mast repair (overhaul) may cost up to $19,950 per repair.
Required MR Mast Modification and Corrosion Protection
After inspection, you must modify each MR mast to apply corrosion protection in accordance with Guimbal Service Bulletin SB 18-023 E before further flight, unless already done. The FAA estimates modification labor at 2 work-hours (2 x $85 = $170) per helicopter and estimates this AD affects 67 U.S. helicopters.
Prohibition on Installing Certain MGB Parts
Starting on the effective date, you may not install any main gear box (MGB) with part number G21-10-000, G21-10-001, G21-10-002, or G21-10-003 unless the MR mast on that affected part has been modified per SB 18-023 E or HG MOD 18-038 and passed the required inspection before installation. This restriction applies from June 24, 2026.
14-Day Reporting Requirement for Defects
If any defects or cracks are found during inspection, you must report the inspection results to Hélicoptères Guimbal within 14 days after the inspection (or after the effective date, whichever is later). The Paperwork Reduction Act paperwork burden is estimated at about 1 hour per response (OMB Control Number 2120-0056).
Your PRIA Score
Personalized for You
How does this regulation affect your finances?
Sign up for a PRIA Policy Scan to see your personalized alignment score for this federal register document and every other regulation we track. We analyze your financial profile against policy provisions to show you exactly what matters to your wallet.
Key Dates
Department and Agencies
Related Federal Register Documents
2026-08943 — Designation-Restrict the Operation of Unmanned Aircraft in Close Proximity to a Fixed Site Facility
The FAA is proposing new rules to keep drones away from certain important fixed sites like power plants or airports to keep everyone safe and secure. If you own or operate one of these sites, you can request a drone flight restriction zone to protect your property and people nearby. Comments are open until July 6, 2026, and these changes could affect drone pilots and site operators, but no big costs are expected.
2026-11560 — Airworthiness Directives; Airbus Helicopters
If you fly or fix Airbus Helicopters like the AS350 or EC130 models, listen up! The FAA fixed some timing mistakes in the old safety checks for the main gearbox parts and now wants you to keep inspecting and fixing them on a new schedule. These updated rules kick in July 14, 2026, and help keep your helicopter safe without extra costs beyond regular maintenance.
2026-11511 — Airworthiness Directives; Airbus SAS Airplanes
The FAA is requiring certain Airbus A350-941 airplanes to fix a problem where some fasteners weren’t tightened properly, which could be unsafe. Airlines must replace affected parts and add extra protection by July 14, 2026. This keeps flights safe but might cost some time and money for the fixes.
2026-11512 — Airworthiness Directives; Gulfstream Aerospace LP Airplanes (Type Certificate Previously Held by Israel Aircraft Industries, Ltd.)
If you own or work with Gulfstream G150 airplanes, the FAA wants you to update your maintenance plans with new safety rules. These changes make inspections tougher to keep the planes safer. You’ll need to act before July 24, 2026, and while it might cost some time and money, it’s all about flying safer and smarter!
2026-11528 — Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes
Pilatus PC-12/47E airplane owners need to update their stall warning system software and add a temporary pilot handbook revision by July 14, 2026. This fix stops the stall warning from going off at the wrong times, keeping flights safer. The FAA also bans installing the old, faulty software, so pilots should act fast to avoid any trouble or extra costs.
2026-11510 — Airworthiness Directives; Airbus SAS Airplanes
The FAA is updating safety rules for certain Airbus A318, A319, A320, and A321 airplanes to include more models and clarify repair steps for door stop fittings that might crack. These inspections and fixes help keep flights safe and must start by July 14, 2026. Airlines affected should expect some extra checks and repairs, but it’s all about making sure passengers fly worry-free.
Previous / Next Documents
Previous: 2026-11505 — DoD Assistance to Non-Government, Entertainment-Oriented Media Productions
The Department of Defense is updating its rules to stop helping movies, TV shows, games, and documentaries that censor their content to please the Chinese government. Starting July 9, 2026, producers must follow new steps to prove their projects don’t bow to these censorship demands if they want DoD support. This change affects entertainment creators and aims to keep U.S. projects free and fair without foreign influence.
Next: 2026-11507 — Dependent Care and Board Member Expense Reimbursement
The NCUA just made it easier for volunteer credit union board members to get reimbursed for dependent care costs when they attend meetings or do official work. This change helps remove a big hurdle for folks with kids or other dependents, making volunteer service more family-friendly. The new rule kicks in on July 9, 2026, letting credit unions tailor policies to fit their unique needs without extra pay limits.