[Federal Register Volume 59, Number 128 (Wednesday, July 6, 1994)]
[Unknown Section]
[Page 0]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 94-16157]
[[Page Unknown]]
[Federal Register: July 6, 1994]
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DEPARTMENT OF TRANSPORTATION
14 CFR Part 39
[Docket No. 93-NM-159-AD; Amendment 39-8963; AD 94-14-15]
Airworthiness Directives; Dassault Aviation Model Mystere-Falcon
50 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 certain Dassault Aviation Model Mystere-Falcon 50 series
airplanes, that requires replacement of certain attachment clamps
installed on the engine exhaust ducts with improved clamps. This
amendment is prompted by reports of failures of certain attachment
clamps due to fatigue cracking. The actions specified by this AD are
intended to prevent such failures, which could cause exhaust gas to
leak and, subsequently, could trigger a false engine fire alarm.
DATES: Effective August 5, 1994.
The incorporation by reference of certain publications listed in
the regulations is approved by the Director of the Federal Register as
of August 5, 1994.
ADDRESSES: The service information referenced in this AD may be
obtained from Falcon Jet Corporation, Customer Support Department,
Teterboro Airport, Teterboro, New Jersey 07608. 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: Stephen Slotte, Aerospace Engineer,
ANM-113, FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW.,
Renton, Washington 98055-4056; telephone (206) 227-2797; 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 Dassault Aviation Model
Mystere-Falcon 50 series airplanes was published in the Federal
Register on November 22, 1993 (58 FR 61636). That action proposed to
require replacement of certain attachment clamps installed on the
engine exhaust ducts with improved clamps.
Interested persons have been afforded an opportunity to participate
in the making of this amendment. Due consideration has been given to
the comments received.
One commenter requests that paragraph (b) of the rule be revised to
indicate that instructions for verifying that the clamp screw is
straight are contained in Dassault Aviation Service Bulletin F50-229
(F50-54-13), Revision 1, dated July 21, 1993 (which is the service
bulletin cited elsewhere in the proposed rule). The commenter notes
that those instructions indicate that the verification cannot be made
if the clamp is installed; the clamp must be removed from the tail pipe
attachment in order to determine if it is bent or not. The FAA concurs
with the commenter's request and has revised the final rule
accordingly.
After careful review of the available data, including the comments
noted above, the FAA has determined that air safety and the public
interest require the adoption of the rule with the change previously
described. The FAA has determined that this change will neither
increase the economic burden on any operator nor increase the scope of
the AD.
The FAA estimates that 133 airplanes of U.S. registry will be
affected by this AD, that it will take approximately 1 work hour 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 operators. Based on these figures, the total
cost impact of the AD on U.S. operators is estimated to be $7,315, or
$55 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:
94-14-15 Dassault Aviation: Amendment 39-8963. Docket 93-NM-159-AD.
Applicability: Model Mystere-Falcon 50 series airplanes, serial
numbers 2 through 216, inclusive; equipped with exhaust duct
attachment clamps, part number (P/N) NH1002299-10 or P/N NH1007763-
10; certificated in any category.
Compliance: Required as indicated, unless accomplished
previously.
To prevent failure of attachment clamps installed on the engine
exhaust ducts, which could cause exhaust gas to leak and,
subsequently, could trigger a false engine fire alarm, accomplish
the following:
(a) For airplanes equipped with exhaust duct attachment clamps
having P/N NH1002299-10: Within 300 flight hours after the effective
date of this AD, or within 6 months after the effective date of this
AD, whichever occurs first, replace attachment clamps having P/N
NH1002299-10 with attachment clamps having P/N NH1007763-10, in
accordance with Dassault Aviation Service Bulletin F50-229 (F50-54-
13), Revision 1, dated July 21, 1993.
(b) For airplanes equipped with exhaust duct attachment clamps
having P/N NH1007763-10: Within 1,400 flight hours after the
effective date of this AD, inspect the attachment clamps installed
on the engine exhaust ducts to verify if the clamp screw is straight
(not bent), in accordance with Dassault Aviation Service Bulletin
F50-229 (F50-54-13), Revision 1, dated July 21, 1993.
(1) If the clamp screw is straight, prior to further flight,
verify if the tightening torque value of the screw is marked on the
attachment clamp as follows: ``NORMAL NET TORQUE 100-120 IN-LBS.''
(i) If the marking is as specified in paragraph (b)(1) of this
AD, no further action is required.
(ii) If the marking is not as specified in paragraph (b)(1) of
this AD, prior to further flight, erase the incorrect marking and
replace it with the correct tightening torque value.
(iii) After correcting the marking, prior to further flight,
ensure that the clamp screw is secured to the tightening torque
value specified in paragraph (b)(1) of this AD.
(2) If the clamp screw is bent, prior to further flight, replace
the discrepant attachment clamp with a new attachment clamp having
the same part number, in accordance with the Accomplishment
Instructions of Dassault Aviation Service Bulletin F50-229 (F50-54-
13), Revision 1, dated July 21, 1993.
(c) As of the effective date of this AD, no person shall install
an exhaust duct attachment clamp having P/N NH1007763-10 on any
airplane, unless that attachment clamp is marked ``NORMAL NET TORQUE
100-120 IN-LBS.''
(d) 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,
FAA, Transport Airplane Directorate. 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.
(e) 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.
(f) The actions shall be done in accordance with Dassault
Aviation Service Bulletin F50-229 (F50-54-13), Revision 1, dated
July 21, 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 Falcon Jet
Corporation, Customer Support Department, Teterboro Airport,
Teterboro, New Jersey 07608. 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.
(g) This amendment becomes effective on August 5, 1994.
Issued in Renton, Washington, on June 28, 1994.
Darrell M. Pederson,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 94-16157 Filed 7-5-94; 8:45 am]
BILLING CODE 4910-13-U
