[Federal Register Volume 61, Number 81 (Thursday, April 25, 1996)]
[Rules and Regulations]
[Pages 18238-18242]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 96-10209]
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DEPARTMENT OF TRANSPORTATION
14 CFR Part 39
[Docket No. 96-NM-75-AD; Amendment 39-9581; AD 96-09-07]
Airworthiness Directives; Boeing Model 757 Series Airplanes
Equipped With Moog Spoiler Actuators
AGENCY: Federal Aviation Administration, DOT.
ACTION: Final rule; request for comments.
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SUMMARY: This amendment supersedes an existing airworthiness directive
(AD) that is applicable to Boeing Model 757 series airplanes equipped
with certain Abex spoiler actuator electro-hydraulic servo valves
(EHSV) installed in certain spoiler actuators. The existing AD
currently requires a one-time inspection of the spoiler actuator to
determine if a suspect EHSV is incorrectly installed, and replacement
of the EHSV, if necessary. That amendment was prompted by reports that
a bias spring in the EHSV of certain spoiler actuators was found to be
incorrectly installed. The actions specified by that AD are intended to
prevent a significant control upset of the airplane as a result of
problems associated with an incorrectly installed EHSV in the spoiler
actuator assembly. This amendment adds additional suspect EHSV's that
require inspection; it also corrects the actuator manufacturer's name
and corrects the serial number of one EHSV.
DATES: Effective May 10, 1996.
Comments for inclusion in the Rules Docket must be received on or
before June 24, 1996.
ADDRESSES: Submit comments in triplicate to the Federal Aviation
Administration (FAA), Transport Airplane Directorate, ANM-103,
Attention: Rules Docket No. 96-NM-75-AD, 1601 Lind Avenue, SW., Renton,
Washington 98055-4056.
Information concerning this AD action may be examined at the FAA,
Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton,
Washington.
FOR FURTHER INFORMATION CONTACT: Don Eiford, Aerospace Engineer,
Systems and Equipment Branch, ANM-130S, FAA, Seattle Aircraft
Certification Office, 1601 Lind Avenue, SW., Renton, Washington;
telephone (206) 227-2788; fax (206) 227-1181.
SUPPLEMENTARY INFORMATION: On March 5, 1996, the FAA issued AD 96-
06-01, amendment 39-9537 (61 FR 9607, March 11, 1996), which is
applicable to Boeing Model 757 series airplanes equipped with
certain electro hydraulic servo valves (EHSV) installed in certain
spoiler actuators. That AD requires a one-time inspection of the
EHSV on the spoiler actuator to determine if a suspect valve is
incorrectly installed; if so, the EHSV must be replaced. That
action was prompted by reports that a bias spring in the EHSV of
certain spoiler actuators was found to be incorrectly installed.
If the jet pipe in the first stage of the EHSV is plugged, or if
the differential pressure between the extend and retract ports
pressurized by the jet pipe is inadequate, an incorrectly installed
bias spring on the second stage spool would cause the spoiler to be
driven into the ``deploy'' position. Such inadvertent spoiler
deployment would result in the airplane experiencing a rolling moment.
If the airplane is already banked or is at a low altitude, or if the
crew does not respond rapidly enough to control the uncommanded roll, a
significant control upset of the airplane could result. The actions
required by AD 96-06-01 are intended to prevent the occurrence of such
a control upset.
New Data Since Issuance of AD 96-06-01
Since the issuance of that AD, the manufacturer has provided the
FAA with data indicating that additional suspect EHSV's may be
installed on the affected airplanes. These suspect EHSV's have serial
numbers of 595, 563, and 909. If any these EHSV's are installed on an
airplane, there is the potential for the occurrence of the same unsafe
condition that was addressed by AD 96-06-01.
Explanation of New AD
Since an unsafe condition has been identified that is likely to
exist or develop on other airplanes of this same type design, this AD
supersedes AD 96-06-01 to require a one-time inspection of the spoiler
actuator to determine if a suspect EHSV is incorrectly installed, and
replacement of the EHSV, if necessary. This AD requires the inspection
for and removal of three additional suspect EHSV's.
Additionally, action is taken throughout this AD to specify the
correct names of the manufacturers of the spoiler actuator and the
EHSV. The subject spoiler actuators are manufactured by Moog; the
subject EHSV's are manufactured by Abex.
Table 1 of this AD has been corrected to indicate that the order
numbers are ``Abex'' order numbers, rather than ``Boeing'' order
numbers.
Due to a typographical error, EHSV serial number ``559'' was
incorrectly listed in Table 1 of AD 96-06-01 as serial number ``569.''
This AD corrects that error.
Cost Impact
According to the records of the EHSV manufacturer, all of the
affected EHSV's were shipped to be installed on Model 757 series
airplanes that currently are operated by non-U.S. operators under
foreign registry. None of the Model 757 series airplanes affected by
this action are on the U.S. Register; therefore, they are not directly
affected by this AD action. However, the FAA considers that this rule
is necessary to ensure that the unsafe condition is addressed in the
event that:
1. any of the subject airplanes are imported and placed on the U.S.
Register in the future; or
[[Page 18239]]
2. any one of the suspect EHSV's is installed on a U.S.-registered
airplane in the the future.
Should an affected airplane be placed on the U.S. Register in the
future, it would require approximately 1 work hour to accomplish the
required actions, at an average labor charge of $60 per work hour.
Based on these figures, the cost impact of this AD would be $60 per
airplane.
Conclusion
Since this AD action does not affect any airplane that is currently
on the U.S. register, it has no adverse economic impact and imposes no
additional burden on any person. Therefore, notice and public
procedures hereon are unnecessary and the amendment may be made
effective in less than 30 days after publication in the Federal
Register.
Comments Invited
Although this action is in the form of a final rule and was not
preceded by notice and opportunity for public comment, comments are
invited on this rule. Interested persons are invited to comment on this
rule by submitting such written data, views, or arguments as they may
desire. Communications shall identify the Rules Docket number and be
submitted in triplicate to the address specified under the caption
ADDRESSES. All communications received on or before the closing date
for comments will be considered, and this rule may be amended in light
of the comments received. Factual information that supports the
commenter's ideas and suggestions is extremely helpful in evaluating
the effectiveness of the AD action and determining whether additional
rulemaking action would be needed.
Comments are specifically invited on the overall regulatory,
economic, environmental, and energy aspects of the rule that might
suggest a need to modify the rule. All comments submitted will be
available, both before and after the closing date for comments, in the
Rules Docket for examination by interested persons. A report that
summarizes each FAA-public contact concerned with the substance of this
AD will be filed in the Rules Docket.
Commenters wishing the FAA to acknowledge receipt of their comments
submitted in response to this rule must submit a self-addressed,
stamped postcard on which the following statement is made: ``Comments
to Docket Number 96-NM-75-AD.'' The postcard will be date stamped and
returned to the commenter.
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, 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 removing amendment 39-9537 (61 FR
9607, March 11, 1996), and by adding a new airworthiness directive
(AD), amendment 39-9581, to read as follows:
96-09-07 Boeing: Amendment 39-9581. Docket 96-NM-75-AD. Supersedes
AD 96-06-01, Amendment 39-9537.
Applicability: Model 757 airplanes, certificated in any
category, that are equipped with Moog spoiler actuators having Abex
electro-hydraulic servo valves (EHSV), part number 72196, with the
serial numbers listed in Table 1 of this AD:
Table 1
------------------------------------------------------------------------
Abex order
EHSV serial No. No.*- Shipment Date *
------------------------------------------------------------------------
AH-0001........................ C716657- 8 November 1991.
AH-0002-....................... C716657- 8 November 1991.
AH-0003-....................... C727995- 25 August 1994.
AH-0004........................ C727995- 25 August 1994.
AH-0005-....................... C727995- 25 August 1995.
AH-0006-....................... C727995- 25 August 1995.
AH-0007-....................... C727995- 25 August 1995.
13-............................ C731181- 12 June 1995.
49-............................ C730878- 01 June 1995.
61-............................ C727955- 13 September 1994.
131-........................... C708905- 13 November 89.
233-........................... C727730- 17 June 1994.
241-........................... C731540- 13 September 1995.
260-........................... C727955- 13 September 1994.
279-........................... C728298- 02 September 1994.
275-........................... C727880- 24 June 1994.
308-........................... C725421- 01 December 1993.
329-........................... C727711- 17 June 1994.
347-........................... C727518- 14 June 1994.
401-........................... C728298- 05 September 1994.
407-........................... C727730- 17 June 1994.
427-........................... C731181- 03 July 1995.
450-........................... C731181- 03 July 1995.
445-........................... C706627- 22 February 89.
457-........................... C731663- 12 September 1995.
456-........................... C728887- 28 November 1994.
463-........................... C731435- 21 August 1995.
484-........................... C727748- 22 June 1994.
515-........................... C727745- 24 June 1994.
559-........................... C728290- 05 September 1994.
563-........................... C724224- 14 September 1993.
579-........................... C724176- 14 September 1993.
595-........................... C727735- 24 January 1994.
611-........................... C727955- 14 September 1994.
607-........................... C727997- 20 July 1994.
647-........................... C728459- 10 October 1994.
726-........................... C731096- 04 September 1995.
725-........................... C729525- 19 December 1994.
819-........................... C728135- 03 August 1994.
890-........................... C726803- 06 April 1994.
874-........................... C730890- 26 April 1995.
909-........................... C724877- 29 November 1993.
912-........................... C727977- 04 August 1994.
991-........................... C713602- 10 December 1990.
998-........................... C731477- 4 September 1995.
1022........................... C708905- 13 November 1989.
1023........................... C708905- 13 November 1989.
1072........................... C709166- 14 November 1989.
1148........................... C730192- 13 March 1995.
1175........................... C723278- 05 August 1993.
1227........................... C728303- 31 August 1994.
1283........................... C731833- 04 September 1995.
1487........................... C728549- 04 October 1994.
1655........................... C728442- 28 November 1994.
1780........................... C726757- 06 April 1994.
1807........................... C728669 29 September 1994.
1862........................... C727625- 17 June 1994.
1929........................... C727977- 04 August 1994.
1986Z.......................... C727730- 17 June 1994.
2017Z.......................... C725411- 24 November 1993.
[[Page 18240]]
2034........................... C727730- 17 June 1994.
2073........................... C731272- 12 September 1995.
2125........................... C725713- 12 January 1994.
2220........................... C729735 29 March 1995.
2334........................... C727730- 17 June 1994.
2348........................... C727730- 17 June 1994.
2426........................... C731623 12 July 1995.
------------------------------------------------------------------------
* The Abex Order Number and Shipment Date are included in this listing
to enable operators to review their records in order to determine if a
suspect EHSV has been ordered, and if, or where, it has been installed
on an airplane.
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 (b) 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 as indicated, unless accomplished
previously.
To prevent a significant control upset of the airplane due to
problems associated with incorrectly assembled Abex electro-
hydraulic servo valves (EHSV) on certain Moog spoiler actuators,
accomplish the following:
(a) Within 6 months after the effective date of this AD, perform
the following procedure: -
(1) While the airplane is on the ground, extend the flaps to 40
degrees. and visually inspect the spoiler actuator EHSV assembly to
determine the location of the second stage bias spring end cap
assembly.
(2) If the second stage bias spring cap assembly is on the aft
or lower side of the EHSV assembly, prior to further flight, replace
the EHSV, having Abex part number 72196, with a serviceable unit in
accordance with the airplane maintenance manual.
Note 2: To be correctly positioned, the second stage bias spring
cap assembly should be on the upper or forward side of the EHSV
assembly. Appendix 1 of this AD provides a visual representation of
the correct positioning of the EHSV assembly.
(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, Seattle Aircraft Certification
Office (ACO), 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, Seattle ACO.
Note 3: Information concerning the existence of approved
alternative methods of compliance with this AD, if any, may be
obtained from the Seattle 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) This amendment becomes effective on May 10, 1996.
Billing Code 4910-13-P
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Appendix 1
[GRAPHIC] [TIFF OMITTED] TR25AP96.011
[[Page 18242]]
Issued in Renton, Washington, on April 19, 1996.
Darrell M. Pederson,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 96-10209 Filed 4-24-96; 8:45 am]
BILLING CODE 4910-13-C
