{"id":"F2007L02132","name":"AD/BELL 222/37 - Tail Rotor Pitch Change Mechanism","slug":"ad-bell-222-37-tail-rotor-pitch-change-mechanism","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":67291,"registerId":"commonwealth-F2007L02132-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bell Helicopter Textron Canada (BHTC) 22","sectionType":"division","heading":"Bell Helicopter Textron Canada (BHTC) 222 Series Helicopters","content":"### Bell Helicopter Textron Canada (BHTC) 222 Series Helicopters\n\n| AD/BELL 222/37 | Tail Rotor Pitch Change Mechanism | 8/2007 |\n| -------------- | --------------------------------- | ------ |\n\n```html\n

Applicability:

Bell Helicopter Textron Canada (BHTC) Models: 222, serial number 47006 through 47089; 222B, serial number 47131 through 47156; 222U, All.

Requirement:

1. Verify the existing rigging of the tail rotor pitch change mechanism in accordance with the Accomplishment Instructions provided in the applicable Alert Service Bulletin (ASB) listed below, or later NAA approved revisions.

Helicopter Model

Applicable Alert Service Bulletin

222 and 222B

222-07-104 issued 9 January2007

222U

222U-07-75 issued 9 January2007

2. Verify if the tail rotor yoke replacement is required, as per Item 3 of Accomplishment Instructions of applicable ASB. If required; replace the yoke with airworthy part.

3. Perform a new rigging procedure as per Accomplishment Instructions of the applicable ASB or later NAA approved revisions.

Note: Transport Canada AD CF 2007-07 dated 11 April 2007 refers.

Compliance:

At the next 150 hour or annual inspection but no later than 31 December 2007, unless already accomplished.

This Airworthiness Directive becomes effective on 2 August 2007.

Background:

It has been determined that the existing rigging procedures for the tail rotor pitch change mechanism have to be changed due to possibility of parts interference. This AD mandates verification of the tail rotor pitch change mechanism and new rigging procedures.

\n```\n\n![](image.001.png) \nDavid Punshon \nDelegate of the Civil Aviation Safety Authority\n\n21 June 2007","sortOrder":0},{"sectionNumber":"AD/BELL 222/37","sectionType":"part","heading":"AD/BELL 222/37","content":"## AD/BELL 222/37","sortOrder":1},{"sectionNumber":"Tail Rotor Pitch Change Mechanism","sectionType":"part","heading":"Tail Rotor Pitch Change Mechanism","content":"## Tail Rotor Pitch Change Mechanism","sortOrder":2},{"sectionNumber":"8/2007","sectionType":"part","heading":"8/2007","content":"## 8/2007","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive stays focused on the existing tail‑rotor pitch‑change mechanism for the listed 222/222B serial ranges and all 222U aircraft, mandating verification, possible yoke replacement and re‑rigging. It does not broaden affected models or systems beyond the specified applicability and aligns with the stated background that rigging procedures must be changed to avoid parts interference."},"complexity_factors":["Technical nature: requires follow‑up rigging and inspection of a mechanical control assembly (tail rotor pitch‑change mechanism).","Conditional part replacement: decision to replace yoke depends on inspection findings (Requirement item 2).","Reference to external documents: work must follow Accomplishment Instructions in specific Alert Service Bulletins or later NAA‑approved revisions.","Serial‑number specific applicability limits affected fleet but requires tracking serials.","Timing linked to maintenance cycles (next 150‑hour or annual inspection) with a hard calendar backstop (31 Dec 2007).","Cross‑jurisdiction note: references Transport Canada AD (background/Note) which may affect operators that follow multiple authorities."],"plain_english_summary":"Requires verification and re‑rigging of the tail‑rotor pitch‑change mechanism on specified Bell 222‑series helicopters, and replacement of the tail‑rotor yoke if inspection shows it is required. It applies to BHTC Models 222 (SN 47006–47089), 222B (SN 47131–47156) and all 222U aircraft.\n\nThe stated purpose is to prevent parts interference by changing rigging procedures. Operators must fund and schedule the inspection/replacement and rigging work at the next 150‑hour or annual inspection or by 31 December 2007 (Requirement items 1–3; Compliance)."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific mechanical rigging issue in the tail rotor pitch change mechanism of specific Bell 222 variants. It has not expanded beyond this original safety purpose."},"complexity_factors":["Short, single-purpose directive with only 3 numbered requirements","No defined terms section — uses plain technical language","Minimal cross-referencing: only references specific manufacturer service bulletins (ASB 222-07-104 and 222U-07-75) and a Canadian AD","Simple conditional logic: only one 'if required' branch for yoke replacement","Clear applicability table with specific serial number ranges","Single compliance deadline with straightforward alternative timing (next inspection OR hard date)"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of specified Bell 222 (S/N 47006–47089), Bell 222B (S/N 47131–47156) and all Bell 222U helicopters to inspect and, if necessary, repair or replace the tail rotor pitch change mechanism and re‑rig it per the manufacturer service instructions. Required by the next 150‑hour or annual inspection (no later than 31 December 2007), the AD addresses parts interference that could lead to loss of tail rotor control and loss of directional control."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-222-37-tail-rotor-pitch-change-mechanism","history":"/api/acts/ad-bell-222-37-tail-rotor-pitch-change-mechanism/history","analysis":"/api/acts/ad-bell-222-37-tail-rotor-pitch-change-mechanism/analysis","conflicts":"/api/acts/ad-bell-222-37-tail-rotor-pitch-change-mechanism/conflicts","importantCases":"/api/acts/ad-bell-222-37-tail-rotor-pitch-change-mechanism/important-cases","documents":"/api/acts/ad-bell-222-37-tail-rotor-pitch-change-mechanism/documents"}}