[Federal Register Volume 60, Number 105 (Thursday, June 1, 1995)]
[Rules and Regulations]
[Pages 28529-28531]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 95-13120]



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DEPARTMENT OF TRANSPORTATION
14 CFR Part 39

[Docket No. 90-CE-67-AD; Amendment 39-9250; AD 95-11-17]


Airworthiness Directives; Jetstream Aircraft Limited (Formerly 
British Aerospace, Regional Aircraft Limited) Jetstream Models 3101 and 
3201 Airplanes

AGENCY: Federal Aviation Administration, DOT.

ACTION: Final rule.

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SUMMARY: This amendment supersedes Airworthiness Directive (AD) 90-13-
12, which currently requires modifying the airplane electrical system 
and revising the emergency procedures section of the Airplane Flight 
Manual (AFM) on certain Jetstream Aircraft Limited (JAL) Jetstream 
Models 3101 and 3201 airplanes. This action retains the requirements of 
AD 90-13-12 for those airplanes that do not have modified inverters 
installed and the inverted transfer function restored. The Federal 
Aviation Administration (FAA) has determined that installing modified 
inverters along with restoring the inverter transfer function corrects 
the problems in the power supply addressed by AD 90-13-12. The actions 
specified by this AD are intended to prevent alternating current system 
failures, which, if not detected and corrected, could result in damage 
to the airplane navigational systems.

DATES: Effective July 19, 1995.
    The incorporation by reference of certain publications listed in 
the regulations is approved by the Director of the Federal Register as 
of July 19, 1995.

ADDRESSES: Service information that applies to this AD may be obtained 
from Jetstream Aircraft Limited, Manager Product Support, Prestwick 
Airport, Ayrshire, KA9 2RW Scotland; telephone (44-292) 79888; 
facsimile (44-292) 79703; or Jetstream Aircraft Inc., Librarian, P.O. 
Box 16029, Dulles International Airport, Washington, DC 20041-6029; 
telephone (703) 406-1161; facsimile (703) 406-1469. This information 
may also be examined at the FAA, Central Region, Office of the 
Assistant Chief Counsel, 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.

FOR FURTHER INFORMATION CONTACT: Mr. Raymond A. Stoer, Program Officer, 
Brussels Aircraft Certification Office, FAA, Europe, Africa, and Middle 
East Office, c/o American Embassy, B-1000 Brussels, Belgium; telephone 
(322) 513.3830; facsimile (322) 230.6899; or Mr. Sam Lovell, Project 
Officer, Small Airplane Directorate, Airplane Certification Service, 
FAA, 1201 Walnut, suite 900, Kansas City, Missouri 64106; telephone 
(816) 426-6934; facsimile (816) 426-2169.

SUPPLEMENTARY INFORMATION: 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 Models 3101 and 3201 airplanes was published in the 
Federal Register on February 10, 1995 (60 FR 7922). The action proposed 
to supersede AD 90-13-12 with a new AD that would (1) retain the 
requirements of modifying [[Page 28530]] the airplane electrical system 
and revising the emergency procedures section of the AFM required by AD 
90-13-12; and (2) require these modification and revisions only for 
those airplanes that do not have modified inverters, P/N 1B350-1B1-3, 
installed in accordance with the instructions in Jetstream Service 
Bulletin (SB) 24-JM 7740, dated November 15, 1990, and do not have the 
inverter transfer function restored in accordance with the instructions 
in Jetstream SB 24-JA 900941, dated November 14, 1990; or Jetstream SB 
24-JA 900941, Revision 1, dated February 18, 1992. Accomplishment of 
the proposed airplane electrical modifications would be in accordance 
with Jetstream Alert Service Bulletin (ASB) 24-A-JA 900443, Revision 1, 
dated May 1, 1990; and Jetstream ASB 24-A-JM 7708, Revision 1, dated 
May 22, 1990.
    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.
    After careful review of all available information 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.
    The FAA estimates that 180 airplanes in the U.S. registry will be 
affected by this AD, that it will take approximately 10 workhours per 
airplane to accomplish the required action, and that the average labor 
rate is approximately $60 an hour. Based on these figures, the total 
cost impact of this AD on U.S. operators is estimated to be $108,000. 
This figure is based on the assumption that no affected owner/operator 
has accomplished the required modification.
    Since AD 90-13-12, which this AD supersedes, requires the same 
actions (except for a limit in the airplane applicability), there is no 
additional cost of this AD on U.S. operators. The $28,800 cost 
difference between this AD (estimated $108,000) and superseded AD 90-
04-04 (estimated $79,200) is a result of inflationary costs used in 
determining the costs of labor ($60 per hour as opposed to $40 per 
hour).
    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 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 removing AD 90-13-12, Amendment 39-
6629 (55 FR 23890, June 13, 1990), and adding a new AD to read as 
follows:

95-11-17 Jetstream Aircraft Limited: Amendment 39-9250; Docket No. 
90-CE-67-AD. Supersedes AD 90-13-12, Amendment 39-6629.

    Applicability: Jetstream Models 3101 and 3201 airplanes (serial 
numbers 697 through 904), certificated in any category, that do not 
have the following:
    1. Two modified inverters, part number (P/N) 1B350-1B1-3, 
installed in accordance with the instructions in Jetstream Service 
Bulletin (SB) 24-JM 7740, dated November 15, 1990; and
    2. The inverter transfer function restored in accordance with 
the instructions in Jetstream SB 24-JA 900941, dated November 14, 
1990; or Jetstream SB 24-JA 900941, Revision 1, dated February 18, 
1992.

    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 use the authority 
provided in paragraph (e) of this AD to request approval from the 
FAA. This approval may address either no action, if the current 
configuration eliminates the unsafe condition, or different actions 
necessary to address the unsafe condition described in this AD. Such 
a request should include an assessment of the effect of the changed 
configuration on the unsafe condition addressed by this AD. In no 
case does the presence of any modification, alteration, or repair 
remove any airplane from the applicability of this AD.

    Compliance: Required as indicated, unless already accomplished 
(compliance with superseded AD 90-13-12).
    To prevent alternating current system failures, which, if not 
detected and corrected, could result in damage to the airplane 
navigational systems, accomplish the following:
    (a) Within the next 50 hours time-in-service (TIS) after the 
effective date of this AD, modify the airplane electrical system and 
revise the emergency procedures section of the airplane flight 
manual in accordance with the instructions in Jetstream Alert 
Service Bulletin (ASB) 24-A-JA 900443, Revision 2, dated November 
15, 1990, Section 2, ACCOMPLISHMENT INSTRUCTIONS; and APPENDIX C.
    (b) Within the next 100 hours TIS after the effective date of 
this AD, modify the airplane electrical system in accordance with 
the instructions in Jetstream ASB 24-A-JM 7708, Revision 1, dated 
May 22, 1990, and revise the emergency procedures section of the 
airplane flight manual in accordance with the instructions in 
Jetstream ASB 24-A-JA 900443, Revision 2, dated November 15, 1990, 
APPENDIX C; or the following Advance Amendment Bulletins (AAB), as 
applicable:

------------------------------------------------------------------------
  Model                             Publication                         
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3101....  AFM HP.4.10, Jetstream AAB number 6 with at least issue 1     
           status; and AFM HP.4.10, Jetstream AAB number 4 with at least
           issue 2 status.                                              
3201....  AFM HP.4.16, Jetstream AAB number 2 with at least issue 2     
           status, and removal of Jetstream AAB number 2, issue 1.      
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    Note 2: Compliance with a previous revision level of the service 
information referenced in this AD fulfills the applicable 
requirements of this AD and is considered ``unless already 
accomplished'' for that portion of the AD.

    (c) Replacement of both inverters, P/N 1B350-1B1-2, with 
modified inverters P/N [[Page 28531]] 1B350-1B1-3 in accordance with 
the ``ACCOMPLISHMENT INSTRUCTIONS'' section of Jetstream SB 24-JM 
7740, dated November 15, 1990, and restoration of the inverter 
transfer function in accordance with Jetstream ASB 24-JA 900941, 
dated November 14, 1990; or Jetstream ASB 24-JA 900941, Revision 1, 
dated February 18, 1992, is considered terminating action for the 
requirements of this AD.
    (d) 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.
    (e) An alternative method of compliance or adjustment of the 
compliance times that provides an equivalent level of safety may be 
approved by the Manager, Brussels Aircraft Certification Office ACO, 
FAA, Europe, Africa, and Middle East Office, c/o American Embassy, 
B-1000 Brussels, Belgium. The request should be forwarded through an 
appropriate FAA Maintenance Inspector, who may add comments and then 
send it to the Manager, Brussels ACO.
    Note 3: Information concerning the existence of approved 
alternative methods of compliance with this AD, if any, may be 
obtained from the Brussels ACO.
    (f) The modifications required by this AD shall be done in 
accordance with Jetstream Alert Service Bulletin 24-A-JA 900443, 
Revision 2, dated November 15, 1990, and Jetstream Alert Service 
Bulletin 24-A-JM 7708, Revision 1, dated May 22, 1990. 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 Limited, Manager 
Product Support, Prestwick Airport, Ayrshire, KA9 2RW Scotland; or 
Jetstream Aircraft Inc., Librarian, P.O. Box 16029, Dulles 
International Airport, Washington, DC, 20041-6029. Copies may be 
inspected at the FAA, Central Region, Office of the Assistant Chief 
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.
    (g) This amendment (39-9250) supersedes AD 90-13-12, Amendment 
39-6629.
    (h) This amendment (39-9250) becomes effective on July 19 1995.
    Issued in Kansas City, Missouri, on May 23, 1995.
Henry A. Armstrong,
Acting Manager, Small Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 95-13120 Filed 5-31-95; 8:45 am]
BILLING CODE 4910-13-U