[Federal Register Volume 63, Number 75 (Monday, April 20, 1998)]
[Rules and Regulations]
[Pages 19390-19391]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 98-10176]


-----------------------------------------------------------------------

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 97-CE-46-AD; Amendment 39-10475; AD 98-08-26]
RIN 2120-AA64


Airworthiness Directives; Pilatus Aircraft Ltd. Models PC-12 and 
PC-12/45 Airplanes

AGENCY: Federal Aviation Administration, DOT.

ACTION: Final rule.

-----------------------------------------------------------------------

SUMMARY: This amendment adopts a new airworthiness directive (AD) that 
applies to certain Pilatus Aircraft Ltd. (Pilatus) Models PC-12 and PC-
12/45 airplanes. This AD requires installing aluminum bonding bushings 
over certain screws in certain fuel tank underwing access panels. 
Several reports from the field revealing fuel tank access panels 
insufficiently electrically bonded to the airframe prompted this 
action. The actions specified by this AD are intended to prevent 
electrical arcing in the fuel tanks and detonation of the fuel-air 
mixture, which can be created by poor electrical bonding of fuel tank 
underwing access panels, and could result in a fire on the airplane.

DATES: Effective May 29, 1998.
    The incorporation by reference of certain publications listed in 
the regulations is approved by the Director of the Federal Register as 
of May 29, 1998.

ADDRESSES: Service information that applies to this AD may be obtained 
from Pilatus Aircraft Ltd., CH-6370 Stans, Switzerland; telephone: +41-
41-6196-233; facsimile: +41-41-6103-351. This information may also be 
examined at the Federal Aviation Administration (FAA), Central Region, 
Office of the Regional Counsel, Attention: Rules Docket No. 97-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.

FOR FURTHER INFORMATION CONTACT: Mr. Roman Gabrys, Project Officer, 
FAA, Small Airplane Directorate, Aircraft Certification Service, 1201 
Walnut, suite 900, Kansas City, Missouri 64106; telephone: (816) 426-
6934; facsimile: (816) 426-2169.

SUPPLEMENTARY INFORMATION:

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 Pilatus 
Models PC-12 and PC-12/45 airplanes was published in the Federal 
Register as a notice of proposed rulemaking (NPRM) on December 19, 1997 
(62 FR 66561). The NPRM proposed to require installing aluminum bonding 
bushings over certain screws in certain fuel tank underwing access 
panels. Accomplishment of the proposed action as specified in the NPRM 
would be in accordance with Pilatus Service Bulletin No. 57-001, dated 
February 28, 1997.
    The NPRM was the result of several reports from the field revealing 
fuel tank access panels insufficiently electrically bonded to the 
airframe.
    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.

[[Page 19391]]

The FAA's Determination

    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.

Cost Impact

    The FAA estimates that 40 airplanes in the U.S. registry will be 
affected by this AD, that it will take approximately 6 workhours per 
airplane to accomplish this action, and that the average labor rate is 
approximately $60 an hour. Parts will be provided at no cost by the 
manufacturer. Based on these figures, the total cost impact of this AD 
on U.S. operators is estimated to be $14,400 or $360 per airplane.

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 U.S.C. 106(g), 40113, 44701.


Sec. 39.13  [Amended]

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

98-08-26  Pilatus Aircraft Ltd.: Amendment 39-10475; Docket No. 97-
CE-46-AD.

    Applicability: Model PC-12 and PC-12/45 airplanes, serial 
numbers MSN 001 through MSN 168, certificated in any category.

    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 electrical arcing in the fuel tanks and detonation of 
the fuel-air mixture, which can be created by poor electrical 
bonding of fuel tank underwing access panels, and could result in a 
fire on the airplane, accomplish the following:
    (a) Install aluminum bonding bushings onto the screws for 
certain fuel tank underwing access panels in accordance with Part A 
and Part B of the Accomplishment Instructions in Pilatus Service 
Bulletin No. 57-001, dated February 28, 1997.
    (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, Small Airplane Directorate, Aircraft 
Certification Service, 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 the Small Airplane Directorate.

    (d) Questions or technical information related to Pilatus 
Service Bulletin No. 57-001, dated February 28, 1997, should be 
directed to Pilatus Aircraft Ltd., CH-6370 Stans, Switzerland. This 
service information may be examined at the FAA, Central Region, 
Office of the Regional Counsel, Room 1558, 601 E. 12th Street, 
Kansas City, Missouri.
    (e) The installations required by this AD shall be done in 
accordance with Pilatus Service Bulletin No. 57-001, dated February 
28, 1997. 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 Pilatus Aircraft 
Ltd., CH-6370 Stans, Switzerland. Copies 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.
    (f) This amendment becomes effective on May 29, 1998.

    Issued in Kansas City, Missouri, on April 9, 1998.
Michael Gallagher,
Manager, Small Airplane Directorate, Aircraft Certification Service.
[FR Doc. 98-10176 Filed 4-17-98; 8:45 am]
BILLING CODE 4910-13-U