[Federal Register Volume 59, Number 161 (Monday, August 22, 1994)]
[Unknown Section]
[Page 0]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 94-20156]
[[Page Unknown]]
[Federal Register: August 22, 1994]
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DEPARTMENT OF TRANSPORTATION
14 CFR Part 39
[Docket No. 94-NM-19-AD; Amendment 39-9003; AD 94-17-08]
Airworthiness Directives; De Havilland Model DHC-7 Series
Airplanes
AGENCY: Federal Aviation Administration, DOT.
ACTION: Final rule.
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SUMMARY: This amendment adopts a new airworthiness directive (AD),
applicable to all de Havilland Model DHC-7 series airplanes, that
requires removal of the aluminum or brass hardware in the firewall
terminal block assembly and replacement with steel hardware. This
amendment is prompted by the results of an investigation, which
revealed that corroded aluminum washers in the DC firewall terminal
block assembly may loosen the electrical connections. The actions
specified by this AD are intended to prevent interruption of DC
electrical power due to connections that may have loosened from
corrosion.
DATES: Effective on September 21, 1994. -
The incorporation by reference of certain publications listed in
the regulations is approved by the Director of the Federal Register as
of September 21, 1994.
ADDRESSES: The service information referenced in this AD may be
obtained from Bombardier, Inc., Bombardier Regional Aircraft Division,
Garratt Boulevard, Downsview, Ontario M3K 1Y5, Canada. 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 FAA Engine and Propeller Directorate, New York
Aircraft Certification Office, 181 South Franklin Avenue, Room 202,
Valley Stream, New York; or at the Office of the Federal Register, 800
North Capitol Street, NW., suite 700, Washington, DC.
FOR FURTHER INFORMATION CONTACT: Peter Cuneo, Electrical Engineer,
Systems and Equipment Branch, ANE-173, FAA, Engine and Propeller
Directorate, New York Aircraft Certification Office, 181 South Franklin
Avenue, Room 202, Valley Stream, New York 11581; telephone (516) 791-
6427; fax (516) 791-9024.
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 all de Havilland Model DHC-7
series airplanes was published in the Federal Register on April 22,
1994 (59 FR 19154). That action proposed to require removal of the
aluminum or brass hardware in the firewall terminal block assembly and
replacement with steel hardware (Modification 7/2617). -
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 55 airplanes of U.S. registry will be
affected by this AD, that it will take approximately 3 work hours per
airplane to accomplish the required actions, and that the average labor
rate is $55 per work hour. Required parts will be nominal in cost.
Based on these figures, the total cost impact of the AD on U.S.
operators is estimated to be $9,075, or $165 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:
94-17-08 De Havilland, Inc.: Amendment 39-9003. Docket 94-NM-19-AD.
-Applicability: All Model DHC-7 series airplanes, certificated
in any category. -
Compliance: Required as indicated, unless accomplished
previously.
To prevent interruption of DC electrical power due to
connections that may have loosened from corrosion, accomplish the
following: -
(a) Within 60 days after the effective date of this AD, remove
the aluminum or brass hardware in the firewall terminal block
assembly and replace with steel hardware (Modification 7/2617), in
accordance with de Havilland Service Bulletin S.B. 7-24-69, dated
October 8, 1993. -
(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, New York Aircraft Certification
Office (ACO), FAA, Engine and Propeller Directorate. Operators shall
submit their requests through an appropriate FAA Principal
Maintenance Inspector, who may add comments and then send it to the
Manager, New York ACO.
-Note: Information concerning the existence of approved
alternative methods of compliance with this AD, if any, may be
obtained from the New York ACO.
-(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 removal and replacement shall be done in accordance with
de Havilland Service Bulletin S.B. 7-24-69, dated October 8, 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 Bombardier, Inc., Bombardier
Regional Aircraft Division, Garratt Boulevard, Downsview, Ontario
M3K 1Y5, Canada. Copies may be inspected at the FAA, Transport
Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or
at the FAA Engine and Propeller Directorate, New York Aircraft
Certification Office, 181 South Franklin Avenue, Room 202, Valley
Stream, New York; or at the Office of the Federal Register, 800
North Capitol Street, NW., suite 700, Washington, DC. -
(e) This amendment becomes effective on September 21, 1994.
Issued in Renton, Washington, on August 11, 1994.
Darrell M. Pederson,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 94-20156 Filed 8-19-94; 8:45 am]
BILLING CODE 4910-13-U
