Airworthiness Directives; Jetstream Aircraft Limited Model 4101 Airplanes

DEPARTMENT OF TRANSPORTATION

14 CFR Part 39

[Docket No. 93-NM-198-AD; Amendment 39-8941; AD 94-13-01]

Airworthiness Directives; Jetstream Aircraft Limited Model 4101

Airplanes

AGENCY: Federal Aviation Administration, DOT.

ACTION: Final rule.

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SUMMARY: This amendment adopts a new airworthiness directive (AD),

applicable to certain Jetstream Model 4101 airplanes, that requires

installation of new fairlead assemblies and P-clips; inspection to

detect damage of the wiring harness at the wing rear spars; repair or

replacement of any damaged wiring harness with a new wiring harness

assembly; and verification of the position of the currently installed

P-clips, and repositioning, if necessary. This amendment is prompted by

a report of abrasion of an electrical power cable in the wiring harness

at the wing rear spar. The actions specified by this AD are intended to

prevent abrasion of electrical power cables in the wiring harnesses at

the wing rear spars, which could lead to a dormant failure of emergency

fuel and hydraulic shutoff services.

DATES: Effective July 20, 1994.

-The incorporation by reference of certain publications listed in

the regulations is approved by the Director of the Federal Register as

of July 20, 1994.

ADDRESSES: The service information referenced in this AD may be

obtained from Jetstream Aircraft, Inc., P.O. Box 16029, Dulles

International Airport, Washington, DC 20041-6029. This information may

be examined at the Federal Aviation Administration (FAA), Transport

Airplane Directorate, Rules Docket, 1601 Lind Avenue SW., Renton,

Washington; or at the Office of the Federal Register, 800 North Capitol

Street, NW., suite 700, Washington, DC.

FOR FURTHER INFORMATION CONTACT: William Schroeder, Aerospace Engineer,

Standardization Branch, ANM-113, FAA, Transport Airplane Directorate,

1601 Lind Avenue SW., Renton, Washington 98055-4056; telephone (206)

227-2148; fax (206) 227-1320.

SUPPLEMENTARY INFORMATION: 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 certain Jetstream Model 4101

airplanes was published in the Federal Register on February 14, 1994

(59 FR 6933). That action proposed to require installation of new

fairlead assemblies and P-clips; inspection to detect damage of the

wiring harness at the wing rear spars; repair or replacement of any

damaged wiring harness with a new wiring harness assembly; and

verification of the position of the currently installed P-clips, and

repositioning, if necessary.

-Interested persons have been afforded an opportunity to

participate in the making of this amendment. No comments were submitted

in response to 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.

-The FAA estimates that 12 airplanes of U.S. registry will be

affected by this AD, that it will take approximately 2 work hours per

airplane to accomplish the required actions, and that the average labor

rate is $55 per work hour. Required parts will be provided by the

manufacturer at no cost to the operator. Based on these figures, the

total cost impact of the AD on U.S. operators is estimated to be

$1,320, or $110 per airplane.

-The total cost impact figure discussed above is based on

assumptions that no operator has yet accomplished any of the

requirements of this AD action, and that no operator would accomplish

those actions in the future if this AD were not adopted.

-The regulations adopted herein will not have substantial direct

effects 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, in

accordance with Executive Order 12612, it is determined that this final

rule does not have sufficient federalism implications to warrant the

preparation of a Federalism Assessment.

-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.

List of Subjects in 14 CFR Part 39

-Air transportation, Aircraft, Aviation safety, Incorporation by

reference, Safety, Adoption of the Amendment.

-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:

PART 39--AIRWORTHINESS DIRECTIVES

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

follows:

Authority: 49 U.S.C. App. 1354(a), 1421 and 1423; 49 U.S.C.

106(g); and 14 CFR 11.89.

Sec. 39.13 [Amended]

-2. Section 39.13 is amended by adding the following new

airworthiness directive:

94-13-01 Jetstream Aircraft Limited: Amendment 39-8941. Docket 93-

NM-198-AD.

Applicability: Model 4101 airplanes having constructor numbers

41004 through 41016 inclusive, certificated in any category.

Compliance: Required as indicated, unless accomplished

previously.

To prevent abrasion of the electrical power cables in the wiring

harnesses at the wing rear spars, which could lead to a dormant

failure of emergency fuel and hydraulic shutoff services, accomplish

the following:

(a) Within 3 months after the effective date of this AD, install

new fairleads and P-clips, perform a visual inspection to detect

damage of the wiring harness at the left and right wing rear spar,

and verify that the currently installed P-clips are properly

positioned; in accordance with Jetstream Series 4100 Service

Bulletin J41-57-003, dated October 13, 1993.

(1) If any wiring harness is found to be damaged, prior to

further flight, accomplish the requirements of either paragraph

(a)(1)(i) or (a)(1)(ii) of this AD.

(i) Replace the damaged wiring harness with a new wiring harness

assembly in accordance with Jetstream Series 4100 Aircraft

Maintenance Manual. Or

(ii) Repair the damaged wiring harness in accordance with a

method approved by the Manager, Standardization Branch, ANM-113,

FAA, Transport Airplane Directorate.

(2) If any currently installed P-clip is found to be improperly

positioned, prior to further flight, reposition the P-clip in

accordance with the service bulletin.

(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, Standardization Branch, ANM-113.

Operators shall submit their requests through an appropriate FAA

Principal Maintenance Inspector, who may add comments and then send

it to the Manager, Standardization Branch, ANM-113.

-Note: Information concerning the existence of approved

alternative methods of compliance with this AD, if any, may be

obtained from the ANM-113.

(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 airplane to a location where

the requirements of this AD can be accomplished.

(d) The inspection shall be done in accordance with Jetstream

Series 4100 Service Bulletin J41-57-003, dated October 13, 1993.

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 Jetstream Aircraft, Inc., P.O. Box

16029, Dulles International Airport, Washington, DC 20041-6029.

Copies may be inspected at the FAA, Transport Airplane Directorate,

1601 Lind Avenue SW., Renton, Washington; or at the Office of the

Federal Register, 800 North Capitol Street NW., suite 700,

Washington, DC.

(e) This amendment becomes effective on July 20, 1994.

Issued in Renton, Washington, on June 9, 1994.

Darrell M. Pederson,

Acting Manager, Transport Airplane Directorate, Aircraft Certification

Service.

[FR Doc. 94-14502 Filed 6-17-94; 8:45 am]

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