[Federal Register Volume 61, Number 93 (Monday, May 13, 1996)]
[Proposed Rules]
[Pages 21979-21980]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 96-11825]



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Proposed Rules
                                                Federal Register
________________________________________________________________________

This section of the FEDERAL REGISTER contains notices to the public of 
the proposed issuance of rules and regulations. The purpose of these 
notices is to give interested persons an opportunity to participate in 
the rule making prior to the adoption of the final rules.

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Federal Register / Vol. 61, No. 93 / Monday, May 13, 1996 / Proposed 
Rules

[[Page 21979]]



DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 95-NM-165-AD]
RIN 2120-AA64


Airworthiness Directives; Beech (Raytheon) Model BAe 125-800A and 
-1000A, and Model Hawker 800 and 1000 Series Airplanes

AGENCY: Federal Aviation Administration, DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: This document proposes the adoption of a new airworthiness 
directive (AD) that is applicable to certain Beech (Raytheon) Model BAe 
125-800A and -1000A, and Model Hawker 800 and 1000 series airplanes. 
This proposal would require modification of the TKS metering pump in 
the airframe ice protection system. This proposal is prompted by a 
report that the pump was found fitted with silver plated wiring. The 
actions specified by the proposed AD are intended to ensure that silver 
plated wiring is removed from these pumps; silver plated wiring 
carrying a direct current can ignite the ice protection fluid (glycol) 
when exposed to it, which could result in a possible fire hazard.

DATES: Comments must be received by June 17, 1996.

ADDRESSES: Submit comments in triplicate to the Federal Aviation 
Administration (FAA), Transport Airplane Directorate, ANM-103, 
Attention: Rules Docket No. 95-NM-165-AD, 1601 Lind Avenue, SW., 
Renton, Washington 98055-4056. Comments may be inspected at this 
location between 9:00 a.m. and 3:00 p.m., Monday through Friday, except 
Federal holidays.
    The service information referenced in the proposed rule may be 
obtained from Raytheon Aircraft Company, Manager, Service Engineering, 
Hawker Customer Support Department, P.O. Box 85, Wichita, Kansas 67201-
0085. This information may be examined at the FAA, Transport Airplane 
Directorate, 1601 Lind Avenue, SW., Renton, Washington.

FOR FURTHER INFORMATION CONTACT: Tim Backman, Aerospace Engineer, 
Standardization Branch, ANM-113, FAA, Transport Airplane Directorate, 
1601 Lind Avenue, SW., Renton, Washington 98055-4056; telephone (206) 
227-2797; fax (206) 227-1149.

SUPPLEMENTARY INFORMATION:

Comments Invited

    Interested persons are invited to participate in the making of the 
proposed 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 above. All 
communications received on or before the closing date for comments, 
specified above, will be considered before taking action on the 
proposed rule. The proposals contained in this notice may be changed in 
light of the comments received.
    Comments are specifically invited on the overall regulatory, 
economic, environmental, and energy aspects of the proposed 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 summarizing each FAA-public contact concerned with 
the substance of this proposal will be filed in the Rules Docket.
    Commenters wishing the FAA to acknowledge receipt of their comments 
submitted in response to this notice must submit a self-addressed, 
stamped postcard on which the following statement is made: ``Comments 
to Docket Number 95-NM-165-AD.'' The postcard will be date stamped and 
returned to the commenter.

Availability of NPRMs

    Any person may obtain a copy of this NPRM by submitting a request 
to the FAA, Transport Airplane Directorate, ANM-103, Attention: Rules 
Docket No. 95-NM-165-AD, 1601 Lind Avenue, SW., Renton, Washington 
98055-4056.

Discussion

    The Civil Aviation Authority (CAA), which is the airworthiness 
authority for the United Kingdom, recently notified the FAA that an 
unsafe condition may exist on certain Beech (Raytheon) Model BAe 125-
800A and -1000A, and Model Hawker 800 and 1000 series airplanes. The 
CAA has received a report indicating that, during a design review, the 
TKS metering pump in the airframe ice protection system was found 
fitted with silver plated wiring. The TKS pump pumps the ice protection 
fluid to the wing leading edge where it is excreted through microholes 
to prevent ice build up. If silver plated wiring is bare, or if its 
insulation is chafed, and it is carrying a direct current, it can 
ignite the ice protection fluid (glycol) when exposed to it. Such an 
ignition could result in a possible fire hazard.
    The manufacturer has issued Hawker Service Bulletin SB.30-61-7676A, 
dated February 15, 1995, which describes procedures for modification of 
the TKS pump (Modification 257676A). The modification involves 
accomplishing an inspection to determine if the flying leads of the TKS 
pump have silver plated conductors; replacement of those leads with 
ones that do not have silver plated conductors; and reidentification of 
the pump. Accomplishment of this modification will ensure that silver 
plated wiring is removed from the TKS pump. The CAA classified this 
service bulletin as mandatory in order to assure the continued 
airworthiness of these airplanes in the United Kingdom.
    This airplane model is manufactured in the United Kingdom and is 
type certificated for operation in the United States under the 
provisions of section 21.29 of the Federal Aviation Regulations (14 CFR 
21.29) and the applicable bilateral airworthiness agreement. Pursuant 
to this bilateral airworthiness agreement, the CAA has kept the FAA 
informed of the situation described above. The FAA has examined the 
findings of the CAA, reviewed all available information, and determined 
that AD action is necessary for products of this type design that are 
certificated for operation in the United States.
    Since an unsafe condition has been identified that is likely to 
exist or develop on other airplanes of the same type design, the 
proposed AD would require modification of the TKS pump.

[[Page 21980]]

The actions would be required to be accomplished in accordance with the 
service bulletin described previously.
    The FAA estimates that 23 airplanes of U.S. registry would be 
affected by this proposed AD, that it would take approximately 1 work 
hour per airplane to accomplish the proposed actions, and that the 
average labor rate is $60 per work hour. Based on these figures, the 
cost impact of the proposed AD on U.S. operators is estimated to be 
$1,380, or $60 per airplane.
    The cost impact figure discussed above is based on assumptions that 
no operator has yet accomplished any of the proposed requirements of 
this AD action, and that no operator would accomplish those actions in 
the future if this AD were not adopted.
    The regulations proposed herein would 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 
proposal would not have sufficient federalism implications to warrant 
the preparation of a Federalism Assessment.
    For the reasons discussed above, I certify that this proposed 
regulation (1) is not a ``significant regulatory action'' under 
Executive Order 12866; (2) is not a ``significant rule'' under the DOT 
Regulatory Policies and Procedures (44 FR 11034, February 26, 1979); 
and (3) if promulgated, 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 draft 
regulatory 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, Safety.

The Proposed Amendment

    Accordingly, pursuant to the authority delegated to me by the 
Administrator, the Federal Aviation Administration proposes to amend 
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 USC 106(g), 40113, 44701.


Sec. 39.13  [Amended]

    2. Section 39.13 is amended by adding the following new 
airworthiness directive:

Beech Aircraft Company (Formerly DeHavilland; Hawker Siddeley; 
British Aerospace, PLC; Raytheon Corporate Jets, Inc.): Docket 95-
NM-165-AD.

    Applicability: Model BAe 125-800A and -1000A, and Model Hawker 
800 and 1000 series airplanes; on which Modification 257676A has not 
been accomplished (reference Hawker Service Bulletin SB.30-61-7676A 
or Aerospace Systems and Technology Service Bulletin S.B.30-25); 
certificated in any category.

    Note 1: This AD applies to each airplane identified in the 
preceding applicability provision, regardless of whether it has been 
otherwise 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.

    Note 2: Beech (Raytheon) Model BAe 125-800B and BAe 125-1000B 
series airplanes are similar in design to the airplanes that are 
subject to the requirements of this AD and, therefore, also may be 
subject to the unsafe condition addressed by this AD. However, as of 
the effective date of this AD, those models are not type 
certificated for operation in the United States. Airworthiness 
authorities of countries in which the Model BAe 125-800B and BAe 
125-1000B series airplanes are approved for operation should 
consider adopting corrective action, applicable to those models, 
that is similar to the corrective action required by this AD.

    Compliance: Required as indicated, unless accomplished 
previously.
    To ensure that silver plate wiring is removed from the TKS 
metering pump and a possible fire hazard eliminated, accomplish the 
following:
    (a) Within 3 months after the effective date of this AD, modify 
the TKS pump in accordance with Hawker Service Bulletin SB.30-61-
7676A, dated February 15, 1995.
    (b) As of the effective date of this AD, no person shall install 
on any airplane a TKS metering pump, having part number XA9511E003-3 
or XA9511E009, unless it has been modified in accordance with the 
requirements of paragraph (a) of this AD.
    (c) 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.

    Note 3: Information concerning the existence of approved 
alternative methods of compliance with this AD, if any, may be 
obtained from the Standardization Branch, ANM-113.

    (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.

    Issued in Renton, Washington, on May 3, 1996.
Darrell M. Pederson,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 96-11825 Filed 5-10-96; 8:45 am]
BILLING CODE 4910-13-P