Airworthiness Directives; Raytheon Corporate Jets Model BAe 125- 1000A Series Airplanes

DEPARTMENT OF TRANSPORTATION

14 CFR Part 39

[Docket No. 94-NM-35-AD; Amendment 39-9026; AD 94-19-04]

Airworthiness Directives; Raytheon Corporate Jets Model BAe 125-

1000A 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 Raytheon Corporate Jets Model BAe 125-1000A

series airplanes, that requires modification of the control circuit

wiring for the engine thrust reversers and of the wiring for

annunciation of rudder bias status. This amendment is prompted by a

report that a single dormant electrical fault in the control circuit of

the thrust reversers could cause a thrust reverser to deploy if the

pilot selects reverse thrust during the approach phase of flight; and

by reports that if an asymmetric thrust reverser condition occurs, the

correct rudder bias may not be annunciated before the flight crew

applies high reverse thrust. The actions specified by this AD are

intended to prevent adversely affected controllability of the airplane.

DATES: Effective October 21, 1994.

The incorporation by reference of certain publications listed in

the regulations is approved by the Director of the Federal Register as

of October 21, 1994.

ADDRESSES: The service information referenced in this AD may be

obtained from Raytheon Corporate Jets Inc., 3 Bishops Square, St.

Albans Road West, Hatfield, Hertfordshire, AL109NE, United Kingdom.

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: William Schroeder, Aerospace Engineer,

Standardization Branch, ANM-113, FAA, Transport Airplane Directorate,

1601 Lind Avenue SW., Renton, Washington 98055-4056; telephone (206)

227-2148; 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 Raytheon Corporate Jets

Model BAe 125-1000A series airplanes was published in the Federal

Register on April 29, 1994 (59 FR 22141). That action proposed to

require modification of the control circuit wiring for the engine

thrust reversers and of the wiring for annunciation of rudder bias

status.

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 19 airplanes of U.S. registry will be

affected by this AD, that it will take approximately 60 work hours per

airplane to accomplish the required actions, and that the average labor

rate is $55 per work hour. Required parts will cost approximately

$1,000 per airplane. Based on these figures, the total cost impact of

the AD on U.S. operators is estimated to be $81,700, or $4,300 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:

94-19-04 Raytheon Corporate Jets, Inc.:

Amendment 39-9026. Docket 94-NM-35-AD.

Applicability: Model BAe 125-1000A series airplanes; serial

numbers 258151, 258159, and 259003 through 259044 inclusive;

certificated in any category.

Compliance: Required as indicated, unless accomplished

previously.

To prevent in-flight deployment of a thrust reverser, which

could adversely affect the controllability of the airplane,

accomplish the following:

(a) Within 8 months after the effective date of this AD, modify

the control circuit wiring for the left and right engine thrust

reversers and rudder bias status annunciation, in accordance with

Raytheon Corporate Jets Service Bulletin SB.78-9-3662B, dated

January 7, 1994.

(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, 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: Information concerning the existence of approved

alternative methods of compliance with this AD, if any, may be

obtained from the Standardization Branch, ANM-113.

(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 modification shall be done in accordance with Raytheon

Corporate Jets Service Bulletin SB.78-9-3662B, dated January 7,

1994. 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 Raytheon Corporate Jets Inc., 3

Bishops Square, St. Albans Road West, Hatfield, Hertfordshire,

AL109NE, United Kingdom. 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.

(e) This amendment becomes effective on October 21, 1994.

Issued in Renton, Washington, on September 14, 1994.

Donald L. Riggin,

Acting Manager, Transport Airplane Directorate, Aircraft Certification

Service.

[FR Doc. 94-23223 Filed 9-20-94; 8:45 am]

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