The Story: Helicopter pilots rarely, if ever, think about the tail rotor pitch horn, but it’s central to the pitch‑change mechanism that maintains directional control. On the Bell 222, the pitch horn now at the center of an emergency AD traces its origin back to 1994. Technical Bulletin 222-94-142 introduced P/N222-012-774-109 as an optional part for the 222 and 222B, published under the title "Tail Rotor Controls, Improvement." It was intended to improve pitch link bearing wear, but the redesign also changed the pitch horn shape. Those changes led to higher stresses induced at certain critical locations and premature fatigue cracking.

Three decades later, Bell received a report of an in-flight failure of thatpitch horn, one that, in the manufacturer's own words, caused "a loss oftail rotor effectiveness and a subsequent loss of control." On August 5,2026, Bell issued Alert Service Bulletin 222-26-115, mandating removal of the774-109 horn "before next flight" on affected serial numbers 47006through 47089, reverting affected helicopters back to the original222-012-705-105/-107 design. Five days later, Transport Canada escalated Bell'sbulletin into Emergency AD CF-2026-39. One day after that, the FAA followedwith its own emergency AD, sent directly to every known U.S. owner andoperator. Three organizations, three mandatory actions, six days.

Bell's own comparison drawing backs that up: the 705-series tang measures0.312–0.322 in. across, while the 774-109's steps down to 0.245–0.255 in.,thinning further still to 0.125–0.135 in. at one location, measurably lessmaterial at the exact spot where it was cracking.

What's now been issued as a Federal Register final rule carries the identicalrequirements as the FAA's emergency AD. It opens a formal comment period(comments due October 13, 2026) and becomes effective September 14, 2026 foranyone who didn't receive the original direct notice, an interim action, theFAA says, pending a redesigned pitch horn.

Field Notes:
• Applicability: Bell Textron Canada Model 222 helicopters certificatedin any category (AD 2026-17-51), narrowed to serial numbers 47006 through 47089per Bell ASB 222-26-115. The 1994 TB covered both the 222 and 222B, but thecurrent mandate applies to the 222 only, Bell attributes this to higher loadson this part in that variant specifically.
• Mandatory Removal: Tail rotor pitch horn P/N 222-012-774-109 AND pitch link P/N 230-312-001-101. The FAA adopted Bell’s paired‑component logic: the horn and link must be removed together because the geometry change was a system‑level modification.
• Required Installation:
Pitch horn P/N 222-012-705-105 or -107
Pitch link P/N 222-012-765-101 or -103
Replacement mounting hardware: Bolts P/N 20-057-5-32D and P/N 20-057-5-28D
• Post-Installation Steps: Perform a full-travel directional controlclearance check and a dynamic balance of the tail rotor hub and blade assembly.
• Prohibition: Installing P/N 222-012-774-109 on any helicopter is nowprohibited.
• Compliance & Ferry Limits: Before further flight, the FAAtightened Transport Canada's "before next flight" language. NoSpecial Flight Permits (SFPs) under 14 CFR 21.197/21.199; affected helicoptersstay grounded until the swap is completed.
• Not Required: The AD doesn't impose a separate logbook-entryrequirement, not because no entry is needed, but because 14 CFR 43.9(a) and91.417(a)(2)(v) already mandate one; the AD simply doesn't duplicate it. Alsonot required: Bell's ASB asks operators to survey every pitch horn's partnumber, serial number, and time since new back to Product Support Engineering,but the FAA declined to make that survey a regulatory requirement.

Why It Matters: This directive is accident-derived, not inspection-derived. Bell's account of an in-flight failure, rather than a routine fatigue finding, prompted the rapid six-day progression from Bell Alert Service Bulletin to Transport Canada Emergency AD to FAA Emergency AD. It also explains why SFPs were explicitly banned: regulators were unwilling to allow even a single ferry flight.

The situation underscores that "newer" isn't always superior. P/N222-012-774-109 was never engineered as a structural upgrade to the pitch hornitself, it was a consequence of a 1994 bearing fix aimed at something elseentirely. Three decades later, Transport Canada attributes the fatigue crackingto stresses at certain critical locations on that same horn's tangs, and Bell'sown dimensions show measurably less material there than on the original design.Reverting to the 705-series horn returns the fleet to a design with decades ofprior service history behind it.

Finally, it's a clean example of the international airworthiness frameworkworking as intended. The manufacturer, Transport Canada, and the FAA eachescalated in reach and enforceability within a single week.

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