{"id":"F2014L00496","name":"AD/CL-600/111 Amdt 1 - Nose Landing Gear Selector Valve","slug":"ad-cl-600-111-amdt-1-nose-landing-gear-selector-valve","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":91630,"registerId":"commonwealth-F2014L00496-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bombardier (Canadair) CL-600 (Challenger","sectionType":"division","heading":"Bombardier (Canadair) CL-600 (Challenger) Series Aeroplanes","content":"### Bombardier (Canadair) CL-600 (Challenger) Series Aeroplanes\n\n| AD/CL-600/111 Amdt 1 | Nose Landing Gear Selector Valve | 9/2014 |\n| -------------------- | -------------------------------- | ------ |\n\n```html\n

Applicability:

This AD applies to the following Bombardier Inc. aircraft:

Model CL-600-1A11 with Serial Numbers (S/N) from 1004 to 1085 inclusive;

Model CL-600-2A12 with S/N from 3001 to 3066 inclusive;

Model CL-600-2B16 with S/N from 5001 to 5194 inclusive;

Model CL-600-2B16 with S/N from 5301 to 5665 inclusive.

Requirement:

Check the nose landing gear (NLG) selector valve and NLG door selector valve that are installed on the aircraft and replace, rework, and identify the valves, as required, in accordance with the Accomplishment Instructions of the applicable Service Bulletin (SB) listed below, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada.

Model

Service Bulletin

Date

CL-600-1A11 (CL-600)

SB 600-0721, Revision 03

23 February 2009

CL-600-2A12 (CL-601)

SB 601-0558, Revision 03

23 February 2009

CL-600-2B16 (CL-601-3A/3R)

SB 601-0558, Revision 03

23 February 2009

CL-600-2B16 (CL-604)

SB 604-32-021, Revision 04

23 February 2009

Accomplishment in accordance with 1 of the following SB revisions also satisfies the requirements of this AD:

- SB 600-0721 Revision 02, dated 16 June 2008;

- SB 601-0558, Revision 02, dated 16 June 2008;

- SB 604-32-021, Revision 03, dated 16 June 2008.

Accomplishment in accordance with the original issuance of, or an earlier revision of, the applicable SB does not satisfy the requirements of this AD.

Note 1: The check is required whether or not an aircraft has previously been checked in accordance with AD/CL-600/86 (which was cancelled and superseded by
AD/CL-600/111). This is necessary since, following the issue of AD/CL-600/86, it has been determined that the S/N range of the affected valves requires expansion from the previous upper limit of S/N 0767 to S/N 2126 and the exact location of each of these additional valves is unknown.

Note 2: Valves that have an S/N with suffix “T” have been manufactured by Tactair Fluid Controls Inc. and do not require any corrective action.

Note 3: Valves manufactured by Kaiser Fluid Technologies, part number (P/N) 750006000, with S/N from 0001 to 2126 inclusive, and ink stamp “SB750006000-1”, have already been checked and reworked as necessary and do not require any additional corrective action.

Note 4: A valve manufactured by Kaiser Fluid Technologies, with P/N 750006000, and S/N from 0001 to 2126 inclusive, must not be installed unless the marking “SB750006000-1” is ink stamped on the valve. The Illustrated Parts Catalogue for the relevant model gives this instruction.

Note 5: CL-600-2B16 (CL-605) aircraft, with S/N of 5701 or higher, are not affected by this AD. They were delivered with valves, P/N 750006000, that either have an S/N with suffix “T” or have the ink stamp marking “SB750006000-1”.

Note 6: Transport Canada AD CF-2009-21R1 dated 26 May 2009 refers. That AD superseded TC AD CF-2006-16R1, which was referred to in CASA AD/CL-600/86, and corrected an error in TC AD CF-2009-21 dated 6 May 2009.

Compliance:

The action set out in the requirement section must be taken by the earlier of the following:

(a) within 250 flight hours after 30 July 2009;

(b) the end of 30 January 2010.

This AD becomes effective on 9 May 2014.

Background:

A specific batch of NLG and NLG door selector valves, P/N 601R75146-1 (Kaiser Fluid Technologies P/N 750006000), may have had their end caps incorrectly lock‑wired or incorrectly torqued during assembly. This condition can lead to the end cap backing off, with consequent damage to a seal and internal leakage within the valve.

Subsequently, if electrical power is transferred or removed from the aircraft before the NLG safety pin is installed, any pressure, including residual pressure, in the No. 3 hydraulic system can result in an uncommanded NLG retraction.

Although there have been no such cases reported on the Challenger models covered by this AD, there have been 6 cases reported on the CRJ (CL600-2B19) aircraft, 1 of which resulted in the collapse of the NLG at the departure gate.

AD/CL-600/111 became effective on 30 July 2009. It mandated a check of the NLG and NLG door selector valves installed on all aircraft in the applicability section above. Depending on the results, replacement, rework and additional identification of the valves may be required.

This AD is issued to correct a typographical error in the table in the requirement section of AD/CL-600/111. The applicable service bulletin reference for the Model CL-600-2A12 (CL-601) has been corrected. There are no changes to the technical requirements or the compliance time of this AD from those in AD/CL-600/111.

\n```\n\n![](image.001.png)\n\nMike Higgins \nDelegate of the Civil Aviation Safety Authority\n\n29 April 2014","sortOrder":0},{"sectionNumber":"AD/CL-600/111 Amdt 1","sectionType":"part","heading":"AD/CL-600/111 Amdt 1","content":"## AD/CL-600/111 Amdt 1","sortOrder":1},{"sectionNumber":"Nose Landing Gear Selector Valve","sectionType":"part","heading":"Nose Landing Gear Selector Valve","content":"## Nose Landing Gear Selector Valve","sortOrder":2},{"sectionNumber":"9/2014","sectionType":"part","heading":"9/2014","content":"## 9/2014","sortOrder":3}],"analysis":{"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"},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This is Amendment 1 to an existing Airworthiness Directive. The amendment explicitly states it only corrects a typographical error in the service bulletin reference table for the CL-600-2A12 model. There are no changes to technical requirements, affected aircraft, or compliance times. The scope remains identical to the original 2009 directive."},"complexity_factors":["Multiple aircraft models and serial number ranges to check for applicability (4 distinct model/serial combinations)","Cross-references to 4 different manufacturer service bulletins with specific revision numbers","Nested exceptions: 6 detailed notes exempting certain valve manufacturers, serial number ranges, and markings","Alternative compliance paths allowing earlier service bulletin revisions (3 specific earlier revisions permitted)","Explicit prohibition on installing certain valves unless specific marking is present","Dual compliance deadlines (flight hours vs. calendar date — whichever comes first)","References to superseded Canadian and Australian directives creating a chain of regulatory history"],"plain_english_summary":"This AD requires owners/operators of certain Bombardier Challenger CL-600/601/604 series jets to inspect and, if needed, repair or replace nose landing-gear and door selector valves after a factory assembly fault (loose end caps) can cause internal leaks and unexpected nose-gear retraction on the ground. Actions are due by the earlier of 250 flight hours after 30 July 2009 or 30 January 2010. Tactair-valved units and valves already marked per the service bulletin are exempt. The amendment fixes a typo only."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"This amendment corrects a typographical error in the service bulletin reference for Model CL‑600‑2A12; it does not change the technical requirements, applicability serial ranges, or compliance time from AD/CL‑600/111. The underlying AD had already expanded the affected valve serial‑number range and mandated inspection, rework/replacement and marking requirements."},"complexity_factors":["Multiple aircraft models and discrete serial‑number ranges listed in applicability (CL‑600, CL‑601 variants, CL‑604)","Requirement delegates detailed procedures to model‑specific Service Bulletins and their approved revisions (dependency on SB 600‑0721, 601‑0558, 604‑32‑021 and specified revisions)","Acceptable compliance if accomplished per certain earlier SB revisions but not by original issuances (nuanced acceptability of revisions)","Several specific exceptions and markings: valves with S/N suffix “T” exempt; Kaiser valves require ink stamp “SB750006000‑1” before installation","Dual compliance deadlines (250 flight hours after a past date or an absolute calendar date) create operational scheduling choices","Interplay with prior AD/CL‑600/86 and Transport Canada ADs noted in background, adding historical cross‑references","Amendment being clerical (corrects a SB reference) means reading both original AD and this amendment is necessary to confirm unchanged technical requirements"],"plain_english_summary":"Requires inspection of the nose landing gear (NLG) selector valve and NLG door selector valve on specified Bombardier CL‑600 series aircraft and, where indicated, replacement, rework and identification of those valves. The AD responds to a batch of valves whose end caps may have been incorrectly wired or torqued, which can lead to seal damage, internal leakage and possible uncommanded NLG retraction; it applies to aircraft in the listed serial‑number ranges and sets a compliance deadline (earlier of 250 flight hours after 30 July 2009 or 30 January 2010)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-111-amdt-1-nose-landing-gear-selector-valve","history":"/api/acts/ad-cl-600-111-amdt-1-nose-landing-gear-selector-valve/history","analysis":"/api/acts/ad-cl-600-111-amdt-1-nose-landing-gear-selector-valve/analysis","conflicts":"/api/acts/ad-cl-600-111-amdt-1-nose-landing-gear-selector-valve/conflicts","importantCases":"/api/acts/ad-cl-600-111-amdt-1-nose-landing-gear-selector-valve/important-cases","documents":"/api/acts/ad-cl-600-111-amdt-1-nose-landing-gear-selector-valve/documents"}}