AD 97-24-07 ACTIVE

This amendment adopts a new airworthiness directive (AD) that applies to Jetstream Aircraft Limited (JAL) Jetstream Models 3101 and 3201 airplanes that have kit JK 2496 and modification JM 7537 installed. This action requires installing magnetic latching relays on the ignition system because of the auto-ignition system becoming disabled when switching from ground power to the airplane s internal power. This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for the United Kingdom. The actions specified by this AD are intended to prevent loss of the airplane s internal power connection to the auto-ignition system, which could cause loss of engine power and possible loss of control of the airplane.

Final rule

97-24-07 Jetstream Aircraft Limited: Amendment 39-10214; Docket No. 92-CE-46-AD.
Applicability: Model 3101 and 3201 airplanes, serial numbers 693 through 870, certificated in any category, that have kit JK 2496 and modification JM 7537 installed.

NOTE 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes 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 (c) 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 the next 100 hours time-in-service (TIS) after the effective date of this AD, unless already accomplished.

To prevent loss of the airplane s internal power connection to the auto-ignition system, which could cause loss of engine power and possible loss of the airplane, accomplish the following:

(a) Install magnetically latching relays with wiring changes (quantity 2) in accordance with the ACCOMPLISHMENT INSTRUCTIONS section of Jetstream Service Bulletin (SB) No. 74-JM 7693A, Original Issue dated May 17, 1990; Revision 3, dated January 28, 1993.

(b) 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.

(c) An alternative method of compliance or adjustment of the compliance time that provides an equivalent level of safety may be approved by the Manager, SmallAirplane Directorate, 1201 Walnut, suite 900, Kansas City, Missouri, 64106. The request shall be forwarded through an appropriate FAA Maintenance Inspector, who may add comments and then send it to the Manager, Small Airplane Directorate.

NOTE 2: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from Small Airplane Directorate.

(d) The installation required by this AD shall be done in accordance with BAe JETSTREAM Service Bulletin No. 74-JM 7693A, ORIGINAL ISSUE: May 17, 1990; REVISION NO. 3, dated January 28, 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 of this document may be obtained from Jetstream Aircraft Limited, Prestwick Airport, Ayrshire, KA9 2RW, Scotland, or may be inspected at the FAA, Central Region, Office of the Regional Counsel, Room 1558, 601 E. 12th Street, Kansas City, Missouri, or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.

NOTE 3: The subject of this AD addresses the United Kingdom s Civil Airworthiness Authority Mandatory BAe JETSTREAM Service Bulletin No. 74-JM 7693A, ORIGINAL ISSUE: May 17, 1990; REVISION NO. 3, dated January 28, 1993.

(e) This amendment (39-10214) becomes effective on December 31, 1997.

Events Leading to the Issuance of This AD
A proposal to amend part 39 of the Federal Aviation Regulations (14 CFR part 39) to include an AD that would apply to certain JAL Jetstream Models 3101 and 3201 airplanes, serial numbers 693 through 870, that have kit JK 2496 and modification JM 7537 installed and are registered in the United States, was published in the Federal Register on April 14, 1997 (62 FR 18062). The action proposed to require installing magnetically latching relays with wiring changes.

Accomplishment of the installation would be in accordance with Jetstream Service Bulletin No. 74-JM 7693A, Original Issue dated May 17, 1990; Revision No. 3 dated January 28, 1993.

Interested persons have been afforded an opportunity to participate in the making of this amendment. No comments were received on the proposed rule or the FAA's determination of the cost to the public.

The FAA's Determination
After careful review of all availableinformation related to the subject presented above, the FAA has determined that air safety and the public interest require the adoption of the rule as proposed except for minor editorial corrections. The FAA has determined that these minor corrections will not change the meaning of the AD and will not add any additional burden upon the public than was already proposed.

Cost Impact
The FAA estimates that 126 airplanes in the U.S. registry will be affected by this AD, that it will take approximately 9 workhours per airplane to accomplish this action, and that the average labor rate is approximately $60 an hour. The manufacturer is providing the parts at no charge. Based on these figures, the total cost impact of this AD on U.S. operators is estimated to be $68,040 or $540 per airplane.

Jetstream has informed the FAA it has received approximately 78 orders for the parts to accomplish this action. If each set of parts is installed on an affected airplane, the estimated cost tothe owners/operators in the U.S. will be reduced from 68,040 to $25,920.

Regulatory Impact
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 copy of the final evaluation prepared for this action is contained in the Rules Docket. A copy of it may be obtained by contacting 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 USC 106(g), 40113, 44701.

39.13 [Amended]
2. Section 39.13 is amended by adding a new airworthiness directive (AD) to read as follows:

Service information that applies to this AD may be obtained from Jetstream Aircraft Limited, Prestwick Airport, Ayrshire, KA9 2RW, Scotland; telephone (0292) 79888; facsimile (0292) 79703. This information may also be examined at the Federal Aviation Administration (FAA), Central Region, Office of the Regional Counsel, Attention: Rules Docket 92-CE-46-AD, Room 1558, 601 E. 12th Street, Kansas City, Missouri 64106; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.

Mr. S.M. Nagarajan, Project Officer, Small Airplane Directorate, 1201 Walnut, suite 900, Kansas City, Missouri, 64106; telephone (816) 426-6932, facsimile (816) 426-2169.