AD 2000-04-20

Airworthiness directive · Hydraulic Relief Valve · Bell Helicopter Textron Canada 407

Effective
April 5, 2000
Published
March 1, 2000 · 65 FR 10937–10938
Issued
February 22, 2000
Model
407
Data sheet
TCDSH2SW
Registered aircraft
985 matched by model
Product
Aircraft · Rotorcraft
Amendment
39-11603
Docket
98-SW-64-AD
Issued as
Final rule

Unofficial copy from the Federal Register XML, document 00-4794. Only the govinfo PDF is the legal edition. DRS record last changed May 30, 2024.

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Summary

This amendment adopts a new airworthiness directive (AD), applicable to Bell Helicopter Textron Canada (BHTC) Model 407 helicopters, that requires replacing a certain hydraulic relief valve (valve) with a different valve. This amendment is prompted by the discovery of a manufacturing defect in a valve. The actions specified by this AD are intended to prevent intermittent loss of hydraulic pressure to the flight controls and subsequent loss of control of the helicopter.

The airworthiness directive

AD 2000-04-20 Bell Helicopter Textron Canada: Amendment 39-11603. Docket No. 98-SW-64-AD.

Applicability: Model 407 helicopters, serial numbers 53000 through 53266, inclusive, certificated in any category.

Note 1:

This AD applies to each helicopter identified in the preceding applicability provision, regardless of whether it has been otherwise modified, altered, or repaired in the area subject to the requirements of this AD. For helicopters that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (b) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.

Compliance: Required within 300 hours time-in-service, unless accomplished previously.

To prevent intermittent loss of hydraulic pressure to the flight controls and subsequent loss of control of the helicopter, accomplish the following:

(a) Remove the hydraulic relief valve (valve), part number (P/N) 206-076-036-101, and replace it with an airworthy valve, P/N 206-076-036-105, in accordance with the Accomplishment Instructions in Bell Helicopter Textron Alert Service Bulletin No. 407-98-20, dated July 3, 1998.

(b) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Regulations Group, Rotorcraft Directorate, FAA. Operators shall submit their requests through an FAA Principal Maintenance Inspector, who may concur or comment and then send it to the Manager, Regulations Group.

Note 2:

Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Regulations Group.

(c) Special flight permits may be issued in accordance with sections 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the helicopter to a location where the requirements of this AD can be accomplished.

(d) The modification shall be done in accordance with the Accomplishment Instructions in Bell Helicopter Textron Alert Service Bulletin No. 407-98-20, dated July 3, 1998. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from Bell Helicopter Textron Canada, 12,800 Rue de l'Avenir, Mirabel, Quebec JON1LO, telephone (800) 463-3036, fax (514) 433-0272. Copies may be inspected at the FAA, Office of the Regional Counsel, Southwest Region, 2601 Meacham Blvd., Room 663, Fort Worth, Texas; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.

(e) This amendment becomes effective on April 5, 2000.

Note 3:

The subject of this AD is addressed in Transport Canada (Canada) AD CF-98-28, dated August 31, 1998.

Rule preamble

The FAA’s background, reasoning and cost estimate, published with the AD.

DatesPage 1

Effective April 5, 2000.

The incorporation by reference of certain publications listed in the regulations is approved by the Director of the Federal Register as of April 5, 2000.

AddressesPage 1

The service information referenced in this AD may be obtained from Bell Helicopter Textron Canada, 12,800 Rue de l'Avenir, Mirabel, Quebec JON1LO, telephone (800) 463-3036, fax (514) 433-0272. This information may be examined at the FAA, Office of the Regional Counsel, Southwest Region, Room 663, Fort Worth, Texas; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.

For further information contactPage 1

Robert McCallister, Aerospace Engineer, FAA, Rotorcraft Directorate, Rotorcraft Standards Staff, Fort Worth, Texas 76193-0170, telephone (817) 222-5121, fax (817) 222-5961.

Supplementary informationPage 2

A proposal to amend part 39 of the Federal Aviation Regulations (14 CFR part 39) to include an airworthiness directive (AD) that is applicable to BHTC Model 407 helicopters was published in the Federal Register on December 8, 1999 (64 FR 68639). That action proposed to require replacing a certain valve with a different valve.

Interested persons have been afforded an opportunity to participate in the making of this amendment. No comments were received on the proposal or the FAA's determination of the cost to the public. The FAA has determined that air safety and the public interest require the adoption of the rule as proposed except that the wording of Note 1 has been changed slightly to reflect the current standard language of this AD note. The FAA has determined that this change will neither increase the economic burden on any operator nor increase the scope of the AD.

The FAA estimates that 146 helicopters of U.S. registry will be affected by this AD, that it will take approximately 1 work hour per helicopter to accomplish the required actions, and that the average labor rate is $60 per work hour. Required parts will cost approximately $1,380. Based on these figures, the total cost impact of the AD on U.S. operators is estimated to be $210,240.

The regulations adopted herein will 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. Therefore, it is determined that this final rule does not have federalism implications under Executive Order 13132.

For the reasons discussed above, I certify that this action (1) Is not a “significant regulatory action” under Executive Order 12866; (2) is not a “significant rule” under 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. A final evaluation has been prepared for this action and it is contained in the Rules Docket. A copy of it may be obtained from the Rules Docket at the location provided under the caption ADDRESSES.

Adoption of the amendmentPage 2

Accordingly, pursuant to the authority delegated to me by the Administrator, the Federal Aviation Administration amends part 39 of the Federal Aviation Regulations (14 CFR part 39) as follows:

1. The authority citation for part 39 continues to read as follows:

2. Section 39.13 is amended by adding a new airworthiness directive to read as follows:

Affected TCDS · 1

The type certificate data sheets for the models this AD names, matched by model and maker.

Registered aircraft · 985

Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.

By aircraft maker
  • Bell Helicopter Textron Canada418 aircraft
  • Bell371 aircraft
  • Bell Textron Canada196 aircraft
By year built
19962026
Registered aircraft by year built: 894 aircraft
199633
199756
199845
199931
200034
200126
200218
200324
200425
200526
200638
200735
200843
200924
201019
201124
201251
201354
201441
201537
201613
20175
20186
201927
202021
202134
202215
202328
202432
202525
20264

91 with no year recorded

By model

Aircraft

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