{"id":"F2006L03801","name":"AD/CIRRUS/6 - Brake Caliper Piston O-Ring Seals","slug":"ad-cirrus-6-brake-caliper-piston-o-ring-seals","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":137647,"registerId":"commonwealth-F2006L03801-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Cirrus Design SR20 and SR22 Series Aerop","sectionType":"division","heading":"Cirrus Design SR20 and SR22 Series Aeroplanes","content":"### Cirrus Design SR20 and SR22 Series Aeroplanes\n\n| AD/CIRRUS/6 | Brake Caliper Piston O-Ring Seals | 13/2006 |\n| ----------- | --------------------------------- | ------- |\n\n| Applicability: | Cirrus Design Corporation Model SR20 and SR 22 aeroplanes in the following groups:Group 1: Model SR20 Aeroplanes, S/N 1005 through 1600.Group 2: Model SR22 Aeroplanes, S/N 0002 through 1739.Group 3: Model SR20 Aeroplanes, S/N 1005 through 1592.Group 4: Model SR22 Aeroplanes, S/N 0002 through 1727. |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement: | 1. For Group 1 and Group 2 aeroplanes:Check the maintenance records to determine whether the brake caliper piston O-ring seals were replaced at the last annual or 100-hour inspection.2. For Group 1 and Group 2 aeroplanes:As a result of the check required by Requirement 1 of this AD, if it is found that there is no record of the replacement of brake caliper piston O-ring seals at the last annual or 100-hour inspection, then do the following:a. Replace the O-ring seals with new O-ring seals; orb. Replace old brake calipers with new brake callipers in accordance with Cirrus Design Corporation Service Bulletin SB 2X-32-13R1 dated16 May 2006 or later FAA approved revision.3. For Group 3 and Group 4 aeroplanes:a. Modify the main landing gear (MLG) wheel fairings to add temperature indicator sticker inspection holes and trim the wheel fairings to prevent them from holding fluids; andb. Install a temperature indicator sticker on the brake calipers.c. Do not install any MLG fairings without also doing the modifications required by Requirement 3a of this AD; and |\n\n```html\n

d. Do not replace any brake calipers without also installing the temperature indicator sticker required by Requirement 3b of this AD.

Follow Cirrus Design Corporation Service Bulletin SB 2X-32-14R1 dated 17 February 2006 or later FAA approved revision.

4. For all aeroplanes:

Insert the appropriate Revision A6 part number (P/N) into the Pilot’s Operating Handbook (POH), as presented in Table 1 of this AD.

Table 1

Affected aeroplanes

Model SR20 or SR22 aeroplane POH P/N

Date FAA-approved

(1) Model SR20, S/N 1148 through 1267

11934-002

18 January 2006.

(2) Model SR20, S/N 1005 through 1147 that have the 3,000-pound gross weight modification following Cirrus Design Corporation Service Bulletin SB 20–01–00, Issued: 25 February 2003.

11934-002

18 January 2006.

(3) SR20, S/N 1268 through 1739

11934-003

18 January 2006.

(4) SR22, S/N 002 through 1739

13772-001

18 January 2006.

Note: FAA AD 2006-21-03 Amdt 39-14787 refers.

Compliance:

1. Within 50 hours time-in-service (TIS) after the effective date of this AD, unless already done.

2. Before further flight after the check required by requirement 1 of this AD.

3. a. Within 50 hours TIS after the effective date of this AD, unless already done.

b. Within 50 hours TIS after the effective sate of this AD, unless already done, and thereafter before further flight anytime the O-ring seals are replaced due to overheating of the brake assembly (temperature indicator sticker turned black).

c. From the effective date of this AD.

d. From the effective date of this AD.

4. Within 50 hours TIS after the effective date of this AD, unless already done.

\n```\n\n| | This Airworthiness Directive becomes effective on 21 December 2006. |\n| ----------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Background: | This AD results from several reports of aeroplanes that experienced brake fires and two aeroplanes that lost directional control. The actions specified in this AD are intended to detect, correct, and prevent overheating damage to the brake caliper piston O-ring seals, which could result in leakage of brake hydraulic fluid. Consequently, this could lead to the loss of braking with loss of aeroplane directional control or brake fire. |\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n25 October 2006","sortOrder":0},{"sectionNumber":"AD/CIRRUS/6","sectionType":"part","heading":"AD/CIRRUS/6","content":"## AD/CIRRUS/6","sortOrder":1},{"sectionNumber":"Brake Caliper Piston O-Ring Seals","sectionType":"part","heading":"Brake Caliper Piston O-Ring Seals","content":"## Brake Caliper Piston O-Ring Seals","sortOrder":2},{"sectionNumber":"13/2006","sectionType":"part","heading":"13/2006","content":"## 13/2006","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":false,"description":"The AD’s scope matches the stated safety concern in the Background: it targets overheating damage to brake caliper piston O‑ring seals on specified SR20/SR22 serial‑number ranges. It prescribes checks, replacements, fairing modifications, sticker installation and POH updates for those listed aircraft, consistent with the AD’s expressed corrective and preventive purpose."},"complexity_factors":["Multiple serial‑number groupings (Groups 1–4) with different actions and applicability across SR20 and SR22 models","Different types of required work: administrative record checks, parts replacement (O‑rings or full calipers), structural fairing modification and sticker installation","Tight, staged compliance deadlines (primarily within 50 hours TIS or before further flight) and recurring requirements tied to sticker indication","Dependencies on external documents: Cirrus Service Bulletins SB 2X‑32‑13R1 and SB 2X‑32‑14R1 (or later FAA‑approved revisions) and reference to FAA AD 2006‑21‑03","Prohibitions that create conditional installation constraints (e.g. do not install fairings or replace calipers unless corresponding modifications/stickers are fitted)","Administrative update requirement to the Pilot’s Operating Handbook with a specific POH part number table","Operational monitoring obligation (temperature‑indicator sticker colour change) that creates an ongoing inspection trigger and potential repeat maintenance","Recordkeeping and inspection traceability burden on operators to confirm prior maintenance actions"],"plain_english_summary":"Requires checks and corrective work on brake caliper piston O‑ring seals and modifications to main landing‑gear wheel fairings for specified Cirrus SR20 and SR22 serial‑number ranges. It mandates checking maintenance records, replacing O‑rings or entire calipers per Cirrus service bulletins, fitting temperature‑indicator stickers, trimming fairings to avoid fluid traps, and updating the Pilot’s Operating Handbook part number.\n\nAffects owners/operators of the listed aircraft. The AD says these steps are intended to detect, correct and prevent brake overheating that could cause hydraulic leaks, loss of braking or brake fires."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive addressing a specific safety defect (brake caliper O-ring seal failures). The scope remains tightly focused on the original safety issue — preventing brake fires and loss of directional control due to overheating seals. The grouping structure and graduated requirements (different actions for different serial number ranges) reflect the manufacturer's service bulletin hierarchy rather than scope creep."},"complexity_factors":["Four distinct aircraft groups with overlapping but non-identical serial number ranges (e.g., Group 1 SR20s 1005-1600 vs Group 3 SR20s 1005-1592)","Multiple conditional requirements: 'if no record found, then do X or Y'","Cross-references to two different Cirrus Service Bulletins (SB 2X-32-13R1 and SB 2X-32-14R1) and one FAA AD (2006-21-03)","Nested compliance deadlines: some within 50 hours TIS, some 'before further flight', some 'from effective date', and one recurring requirement (temperature sticker after overheating)","Prohibitive requirements ('Do not install... without also doing...') creating interdependent compliance obligations","Table-based POH update requirements with four different part number scenarios based on serial number ranges and modification status","Typographical errors in source text ('effective sate' instead of 'date') that could create ambiguity"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of specified Cirrus SR20 and SR22 aeroplanes (certain serial-numbered aircraft) to address failing brake caliper O‑ring seals that have caused fires and loss of control. It mandates record checks and, where needed, O‑ring or caliper replacement, modification of wheel fairings and installation of temperature-indicating stickers, and POH updates. Actions must be completed promptly (generally within 50 flight hours or sooner if overheating is detected) to prevent brake failures and fires."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-cirrus-6-brake-caliper-piston-o-ring-seals","history":"/api/acts/ad-cirrus-6-brake-caliper-piston-o-ring-seals/history","analysis":"/api/acts/ad-cirrus-6-brake-caliper-piston-o-ring-seals/analysis","conflicts":"/api/acts/ad-cirrus-6-brake-caliper-piston-o-ring-seals/conflicts","importantCases":"/api/acts/ad-cirrus-6-brake-caliper-piston-o-ring-seals/important-cases","documents":"/api/acts/ad-cirrus-6-brake-caliper-piston-o-ring-seals/documents"}}