# 74 FR 69038: Airworthiness Directives; Bombardier, Inc. Model DHC-8-400 Series Airplanes

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/FR_PRORULE_E9-30905

## Section

- **Citation:** 74 FR 69038
- **Heading:** Airworthiness Directives; Bombardier, Inc. Model DHC-8-400 Series Airplanes
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** August 14, 2026
- **Source:** Compiled text
- **Location:** Federal Register / Vol. 74 / 74 FR 69038

## Text

DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA-2009-1223; Directorate Identifier 2009-NM-114-AD] RIN 2120-AA64 Airworthiness Directives; Bombardier, Inc. Model DHC-8-400 Series Airplanes AGENCY:
Federal Aviation Administration (FAA), DOT.

ACTION:
Notice of proposed rulemaking (NPRM).

SUMMARY:
We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:
During final Acceptance Test Procedure (ATP), a small oil leak was discovered on the Spoiler Unload Valve and Rudder Shutoff Valve bodies. Investigation revealed that a number of valves were manufactured with an incorrect wall thickness. This thin wall condition caused cracking, subsequent external weeping and pressure loss from the subject valves.
This condition, if not corrected, will cause a loss of hydraulic fluid and subsequent loss of spoiler and/or rudder control.

The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.

DATES:
We must receive comments on this proposed AD by February 16, 2010.

ADDRESSES:
You may send comments by any of the following methods:
• Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the instructions for submitting comments.
• Fax: (202) 493-2251.
• Mail: U.S. Department of Transportation, Docket Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New Jersey Avenue, SE., Washington, DC 20590.
• Hand Delivery: U.S. Department of Transportation, Docket Operations, M-30, West Building Ground Floor, Room W12-40, 1200 New Jersey Avenue, SE., Washington, DC, between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays
• Mail: U.S. Department of Transportation, Docket Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New Jersey Avenue, SE., Washington, DC 20590.
• Hand Delivery: U.S. Department of Transportation, Docket Operations, M-30, West Building Ground Floor, Room W12-40, 1200 New Jersey Avenue, SE., Washington, DC, between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays.
For service information identified in this proposed AD, contact Bombardier, Inc., 400 Côte-Vertu Road West, Dorval, Québec H4S 1Y9, Canada; telephone 514-855-5000; fax 514-855-7401; e-mail thd.qseries@aero.bombardier.com; Internet http://www.bombardier.com. You may review copies of the referenced service information at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington. For information on the availability of this material at the FAA, call 425-227-1221 or 425-227-1152.
Examining the AD Docket
You may examine the AD docket on the Internet at http://www.regulations.gov; or in person at the Docket Operations office between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this proposed AD, the regulatory evaluation, any comments received, and other information. The street address for the Docket Operations office (telephone (800) 647-5527) is in the ADDRESSES section. Comments will be available in the AD docket shortly after receipt.
FOR FURTHER INFORMATION CONTACT:
Cesar Gomez, Aerospace Engineer, Airframe and Mechanical Systems Branch, ANE-171, FAA, New York Aircraft Certification Office, 1600 Stewart Avenue, Suite 410, Westbury, New York 11590; telephone (516) 228-7318; fax (516) 794-5531.

SUPPLEMENTARY INFORMATION:
Comments Invited
We invite you to send any written relevant data, views, or arguments about this proposed AD. Send your comments to an address listed under the ADDRESSES section. Include “Docket No. FAA-2009-1223; Directorate Identifier 2009-NM-114-AD” at the beginning of your comments
d on the Spoiler Unload Valve and Rudder Shutoff Valve bodies. Investigation revealed that a number of valves were manufactured with an incorrect wall thickness. This thin wall condition caused cracking, subsequent external weeping and pressure loss from the subject valves.
This condition, if not corrected, will cause a loss of hydraulic fluid and subsequent loss of spoiler and/or rudder control.
Revision 1 of this directive mandates a new interval for the initial inspection, clarifies the time for replacement of the valve(s) specified in Paragraphs 1.2 and 2.2, and clarifies the labeling of the inspected valves in Paragraph 3 of this directive.
Required actions include doing detailed inspections of the left-hand and right-hand spoiler unload and rudder shutoff valve for leaking and weeping, replacing discrepant left-hand and right-hand spoiler unload and rudder shutoff valves with new or serviceable valves, and eventually replacing all valves having a certain part number. You may obtain further information by examining the MCAI in the AD docket.
Relevant Service Information
Bombardier has issued Service Bulletins 84-27-37 and 84-27-39, both dated February 5, 2009. The actions described in this service information are intended to correct the unsafe condition identified in the MCAI.
FAA's Determination and Requirements of This Proposed AD
This product has been approved by the aviation authority of another country, and is approved for operation in the United States. Pursuant to our bilateral agreement with the State of Design Authority, we have been notified of the unsafe condition described in the MCAI and service information referenced above. We are proposing this AD because we evaluated all pertinent information and determined an unsafe condition exists and is likely to exist or develop on other products of the same type design.
Differences between this AD and the MCAI or Service Information
We have reviewed the MCAI and related service information and, in general, agree with their substance
d service information referenced above. We are proposing this AD because we evaluated all pertinent information and determined an unsafe condition exists and is likely to exist or develop on other products of the same type design.
Differences between this AD and the MCAI or Service Information
We have reviewed the MCAI and related service information and, in general, agree with their substance. But we might have found it necessary to use different words from those in the MCAI to ensure the AD is clear for U.S. operators and is enforceable. In making these changes, we do not intend to differ substantively from the information provided in the MCAI and related service information.
We might also have proposed different actions in this AD from those in the MCAI in order to follow FAA policies. Any such differences are highlighted in a NOTE within the proposed AD.
Costs of Compliance
Based on the service information, we estimate that this proposed AD would affect about 61 products of U.S. registry. We also estimate that it would take about 3 work-hours per product to comply with the basic requirements of this proposed AD. Required parts would cost about $0 per product. Where the service information lists required parts costs that are covered under warranty, we have assumed that there will be no charge for these costs. As we do not control warranty coverage for affected parties, some parties may incur costs higher than estimated here. The average labor rate is $80 per work-hour. Based on these figures, we estimate the cost of the proposed AD on U.S. operators to be $14,640, or $240 per product.
Authority for This Rulemaking
Title 49 of the United States Code specifies the FAA's authority to issue rules on aviation safety. Subtitle I, section 106, describes the authority of the FAA Administrator. “Subtitle VII: Aviation Programs,” describes in more detail the scope of the Agency's authority
, we estimate the cost of the proposed AD on U.S. operators to be $14,640, or $240 per product.
Authority for This Rulemaking
Title 49 of the United States Code specifies the FAA's authority to issue rules on aviation safety. Subtitle I, section 106, describes the authority of the FAA Administrator. “Subtitle VII: Aviation Programs,” describes in more detail the scope of the Agency's authority.
We are issuing this rulemaking under the authority described in “Subtitle VII, Part A, Subpart III, Section 44701: General requirements.” Under that section, Congress charges the FAA with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce. This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action.
Regulatory Findings
We determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would not have a substantial direct effect on the States, on the relationship between the national Government and the States, or on the distribution of power and responsibilities among the various levels of government.
For the reasons discussed above, I certify this proposed regulation:
1. Is not a “significant regulatory action” under Executive Order 12866;
2. Is not a “significant rule” under the DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979); and
3. Will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.
We prepared a regulatory evaluation of the estimated costs to comply with this proposed AD and placed it in the AD docket.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety
have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.
We prepared a regulatory evaluation of the estimated costs to comply with this proposed AD and placed it in the AD docket.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.

The Proposed Amendment
Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 14 CFR part 39 as follows:
PART 39—AIRWORTHINESS DIRECTIVES
1. The authority citation for part 39 continues to read as follows:
Authority:
49 U.S.C. 106(g), 40113, 44701.
§ 39.13 [Amended] 2. The FAA amends § 39.13 by adding the following new AD:
BOMBARDIER, INC. (Formerly de Havilland, Inc.): Docket No. FAA-2009-1223; Directorate Identifier 2009-NM-114-AD. Comments Due Date
(a) We must receive comments by February 16, 2010.
Affected ADs
(b) None.
Applicability
(c) This AD applies to Bombardier, Inc. Model DHC-8-400, DHC-8-401, and DHC-8-402 series airplanes, certificated in any category, serial numbers 4105 through 4179 inclusive.
Subject
(d) Air Transport Association (ATA) of America Code 27: Flight controls.
Reason
(e) The mandatory continuing airworthiness information (MCAI) states:
During final Acceptance Test Procedure (ATP), a small oil leak was discovered on the Spoiler Unload Valve and Rudder Shutoff Valve bodies. Investigation revealed that a number of valves were manufactured with an incorrect wall thickness. This thin wall condition caused cracking, subsequent
This condition, if not corrected, will cause a loss of hydraulic fluid and subsequent loss of spoiler and/or rudder control.
Revision 1 of this directive mandates a new interval for the initial inspection, clarifies the time for replacement of the valve(s) specified in Paragraphs 1.2 and 2.2, and clarifies the labeling of the inspected valves in Paragraph 3 of this directive
acking, subsequent
This condition, if not corrected, will cause a loss of hydraulic fluid and subsequent loss of spoiler and/or rudder control.
Revision 1 of this directive mandates a new interval for the initial inspection, clarifies the time for replacement of the valve(s) specified in Paragraphs 1.2 and 2.2, and clarifies the labeling of the inspected valves in Paragraph 3 of this directive.
Required actions include doing detailed inspections of the left-hand and right-hand spoiler unload and rudder shutoff valve for leaking and weeping, replacing discrepant left-hand and right-hand spoiler unload and rudder shutoff valves with new or serviceable valves, and eventually replacing all valves having a certain part number.
Compliance
(f) You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Actions
(g) Do the actions in paragraphs (g)(1), (g)(2), and (g)(3) of this AD, as applicable.
(1) For airplanes having serial numbers 4105 through 4172 inclusive: Within 750 flight hours after the effective date of this AD, do a detailed inspection of the left-hand and right-hand spoiler unload valves having part number (P/N) 396000-1005 for leaking and weeping, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 84-27-37, dated February 5, 2009.
(i) If any leaking or weeping is found, prior to further flight, replace the affected spoiler unload valve with a new or serviceable valve, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 84-27-37, dated February 5, 2009.
(ii) If no leaking and no weeping are found, replace the valves with new or serviceable valves within 6,000 flight hours after the initial inspection required by paragraph (g)(1) of this AD, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 84-27-37, dated February 5, 2009.
complishment Instructions of Bombardier Service Bulletin 84-27-37, dated February 5, 2009.
(ii) If no leaking and no weeping are found, replace the valves with new or serviceable valves within 6,000 flight hours after the initial inspection required by paragraph (g)(1) of this AD, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 84-27-37, dated February 5, 2009.
(2) For airplanes having serial numbers 4113 through 4179 inclusive: Within 750 flight hours after the effective date of this AD, do a detailed inspection of the left-hand and right-hand rudder shutoff valves having P/N 412700-1001 for leaking and weeping, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 84-27-39, dated February 5, 2009.
(i) If any leaking or weeping is found, prior to further flight, replace the affected rudder shutoff valve with a new or serviceable valve, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 84-27-39, dated February 5, 2009.
(ii) If no leaking and no weeping are found, replace the valves with new or serviceable valves within 6,000 flight hours after the initial inspection required by paragraph (g)(2) of this AD, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 84-27-39, dated February 5, 2009.
(3) As of the effective date of this AD, no person may install a spoiler unload valves assembly having (P/N) 396000-1005, having a serial number 0289 through 0424 inclusive, or rudder shutoff valve having (P/N) 412700-1001, having a serial number from 0239 through 0384 inclusive, on any airplane, unless the valve has been inspected by the manufacturer and labeled with a suffix “A” after the serial number.
FAA AD Differences
Note 1:
This AD differs from the MCAI and/or service information as follows: No differences.
Other FAA AD Provisions
ough 0424 inclusive, or rudder shutoff valve having (P/N) 412700-1001, having a serial number from 0239 through 0384 inclusive, on any airplane, unless the valve has been inspected by the manufacturer and labeled with a suffix “A” after the serial number.
FAA AD Differences
Note 1:
This AD differs from the MCAI and/or service information as follows: No differences.
Other FAA AD Provisions
(h) The following provisions also apply to this AD:
(1) Alternative Methods of Compliance (AMOCs): The Manager, New York Aircraft Certification Office (ACO), ANE-170, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Send information to ATTN: Program Manager, Continuing Operational Safety, FAA, New York ACO, 1600 Stewart Avenue, Suite 410, Westbury, New York, 11590; telephone 516-228-7300; fax 516-794-5531. Before using any approved AMOC on any airplane to which the AMOC applies, notify your principal maintenance inspector (PMI) or principal avionics inspector (PAI), as appropriate, or lacking a principal inspector, your local Flight Standards District Office. The AMOC approval letter must specifically reference this AD.
(2) Airworthy Product: For any requirement in this AD to obtain corrective actions from a manufacturer or other source, use these actions if they are FAA-approved. Corrective actions are considered FAA-approved if they are approved by the State of Design Authority (or their delegated agent). You are required to assure the product is airworthy before it is returned to service.
(3) Reporting Requirements: For any reporting requirement in this AD, under the provisions of the Paperwork Reduction Act (44 U.S.C. 3501 et seq. ), the Office of Management and Budget (OMB) has approved the information collection requirements and has assigned OMB Control Number 2120-0056.
Related Information
ou are required to assure the product is airworthy before it is returned to service.
(3) Reporting Requirements: For any reporting requirement in this AD, under the provisions of the Paperwork Reduction Act (44 U.S.C. 3501 et seq. ), the Office of Management and Budget (OMB) has approved the information collection requirements and has assigned OMB Control Number 2120-0056.
Related Information
(i) Refer to MCAI Canadian Airworthiness Directive CF-2009-25R1, dated July 23, 2009; Bombardier Service Bulletin 84-27-37, dated February 5, 2009; and Bombardier Service Bulletin 84-27-39, dated February 5, 2009; for related information.

Issued in Renton, Washington, on December 21, 2009. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service.

[FR Doc. E9-30905 Filed 12-29-09; 8:45 am] BILLING CODE 4910-13-P

## Nearby sections

- [74 FR 61 Replacement Digital Television Translator Service](https://www.frixlaw.com/law-library/statutes/FR_PRORULE_E8-31227.md)
- [74 FR 254 Fisheries of the Exclusive Economic Zone Off Alaska; Bering Sea and Aleutian Islands and Gulf of Alaska Groundfish; Limited Access Privilege Programs](https://www.frixlaw.com/law-library/statutes/FR_PRORULE_E8-31365.md)
- [74 FR 411 Amending the Water and Waste Program Regulations](https://www.frixlaw.com/law-library/statutes/FR_PRORULE_E8-31377.md)
- [74 FR 419 Endangered and Threatened Wildlife and Plants; Partial 90-Day Finding on a Petition To List 475 Species in the Southwestern United States as Threatened or Endangered With Critical Habitat](https://www.frixlaw.com/law-library/statutes/FR_PRORULE_E8-31454.md)
- [74 FR 651 Importation of Hass Avocados From Peru](https://www.frixlaw.com/law-library/statutes/FR_PRORULE_E8-31474.md)
- [74 FR 667 Approval, Disapproval, and Promulgation of Air Quality Implementation Plans; Utah; Revisions to New Source Review Rules](https://www.frixlaw.com/law-library/statutes/FR_PRORULE_E9-48.md)
- [74 FR 789 Proposed Flood Elevation Determinations](https://www.frixlaw.com/law-library/statutes/FR_PRORULE_E9-74.md)
- [74 FR 868 Oklahoma Regulatory Program](https://www.frixlaw.com/law-library/statutes/FR_PRORULE_E9-204.md)
- [74 FR 1153 Airworthiness Directives; Boeing Model 737-300, -400, and -500 Series Airplanes](https://www.frixlaw.com/law-library/statutes/FR_PRORULE_E9-314.md)
- [74 FR 1550 Medicare Program; Prescription Drug Benefit Program: Payments to Sponsors of Retiree Prescription Drug Plans](https://www.frixlaw.com/law-library/statutes/FR_PRORULE_E9-151.md)
- [74 FR 1649 Airworthiness Directives; Airbus Model A330-200 and -300 Series Airplanes, and A340-200, -300, -500 and -600 Series Airplanes](https://www.frixlaw.com/law-library/statutes/FR_PRORULE_E9-458.md)
- [74 FR 1653 Television Broadcasting Services; Cadillac, MI](https://www.frixlaw.com/law-library/statutes/FR_PRORULE_E9-509.md)
- [74 FR 1954 Healthy Forests Reserve Program](https://www.frixlaw.com/law-library/statutes/FR_PRORULE_E9-506.md)
- [74 FR 1971 Marketing Order Regulating the Handling of Spearmint Oil Produced in the Far West; Salable Quantities and Allotment Percentages for the 2009-2010 Marketing Year](https://www.frixlaw.com/law-library/statutes/FR_PRORULE_E9-604.md)

---

Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/FR_PRORULE_E9-30905. Check the current official text before relying on it. Not legal advice.