Airworthiness Directives; Raytheon Corporate Jets Model DH/BH/HS/ BAe 125 and Hawker 800 and 1000 Series Airplanes

DEPARTMENT OF TRANSPORTATION

14 CFR Part 39

[Docket No. 94-NM-69-AD; Amendment 39-8919; AD 94-11-03]

Airworthiness Directives; Raytheon Corporate Jets Model DH/BH/HS/

BAe 125 and Hawker 800 and 1000 Series Airplanes

AGENCY: Federal Aviation Administration, DOT.

ACTION: Final rule; request for comments.

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SUMMARY: This amendment adopts a new airworthiness directive (AD) that

is applicable to certain Raytheon Corporate Jets Model DH/BH/HS BAe 125

and Hawker 800 and 1000 series airplanes. This action requires a visual

inspection to determine whether adequate clearance exists between the

fan venturi motor casing and the adjacent equipment, and adjustments,

if necessary; and a visual inspection to detect signs of overheating,

degradation of insulating materials, and ingestion of debris into the

motor, and replacement of discrepant parts with serviceable parts. This

amendment is prompted by reports of smoke emanating from the lavatory

due to overheating of the fan venturi motor. The actions specified in

this AD are intended to prevent smoke or fire in the cabin while the

airplane is in flight.

DATES: Effective June 10, 1994.

The incorporation by reference of certain publications listed in

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

of June 10, 1994.

Comments for inclusion in the Rules Docket must be received on or

before July 25, 1994.

ADDRESSES: Submit comments in triplicate to the Federal Aviation

Administration (FAA), Transport Airplane Directorate, ANM-103,

Attention: Rules Docket No. 94-NM-69-AD, 1601 Lind Avenue SW., Renton,

Washington 98055-4056.

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 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.

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: 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 Raytheon

Corporate Jets Model DH/BH/HS/BAe 125 and Hawker 800 and 1000 series

airplanes. The CAA advises it has received reports of smoke emanating

from the lavatory in the rear of the cabin while several airplanes were

being prepared for departure. Investigation revealed that the venturi

fan motor overheated due to insufficient clearance between the motor

and the adjacent sound insulation and wiring. This condition, if not

corrected, could result in smoke or fire in the cabin while the

airplane is in flight.

Raytheon Corporate Jets, Inc., has issued Alert Service Bulletin SB

21-A150, dated February 22, 1994, that describes procedures for a one-

time visual inspection to determine whether adequate clearance exists

between the fan venturi motor casing and the adjacent equipment

(including insulating materials, ducting, and wire looms) and

adjustment of the insulating materials, ducting, and/or looms, if

necessary. This alert service bulletin also describes procedures for a

one-time visual inspection to detect signs of overheating, degradation

of insulating materials, and ingestion of debris into the motor, and

replacement of discrepant parts with serviceable parts. The CAA

classified this alert service bulletin as mandatory and issued a

British airworthiness directive in order to assure the continued

airworthiness of these airplanes in the United Kingdom.

These airplane models are manufactured in the United Kingdom and

are type certificated for operation in the United States under the

provisions of Sec. 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 registered

in the United States, this AD is being issued to prevent smoke or fire

in the cabin while the airplane is in flight. This AD requires a one-

time visual inspection to determine whether adequate clearance exists

between the fan venturi motor casing and the adjacent equipment

(including insulating materials, ducting, and wire looms) and

adjustment of the insulating materials, ducting, and/or looms, if

necessary. This AD also requires a one-time visual inspection to detect

signs of overheating, degradation of insulating materials, and

ingestion of debris into the motor, and replacement of discrepant parts

with serviceable parts. The actions are required to be accomplished in

accordance with the alert service bulletin described previously.

Since a situation exists that requires the immediate adoption of

this regulation, it is found that notice and opportunity for prior

public comment hereon are impracticable, and that good cause exists for

making this amendment effective in less than 30 days.

Comments Invited

Although this action is in the form of a final rule that involves

requirements affecting flight safety and, thus, was not preceded by

notice and an 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 notice must submit a self-addressed,

stamped postcard on which the following statement is made: ``Comments

to Docket Number 94-NM-69-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.

The FAA has determined that this regulation is an emergency

regulation that must be issued immediately to correct an unsafe

condition in aircraft, and is not a ``significant regulatory action''

under Executive Order 12866. It has been determined further that this

action involves an emergency regulation under DOT Regulatory Policies

and Procedures (44 FR 11034, February 26, 1979). If it is determined

that this emergency regulation otherwise would be significant under DOT

Regulatory Policies and Procedures, a final regulatory evaluation will

be prepared and placed in the Rules Docket. A copy of it, if filed, 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:

94-11-03 Raytheon Corporate Jets, Inc. Amendment 39-8919. Docket 94-

NM-69-AD.

Applicability: Model DH/BH/HS/BAe 125 and Hawker 800 and 1000

series airplanes on which Modification 253514A has not been

installed, certificated in any category.

Compliance: Required as indicated, unless accomplished

previously.

To prevent smoke or fire in the cabin while the airplane is in

flight, accomplish the following:

(a) Within 30 days after the effective date of this AD, perform

a visual inspection to determine whether clearance between the fan

venturi motor casing and the adjacent equipment (including

insulating materials, ducting, and wire looms) is within the limits

specified in Raytheon Corporate Alert Jets Service Bulletin SB 21-

A150, dated February 22, 1994, and to detect signs of overheating,

degradation of insulating materials in the vicinity of the fan

venturi, and ingestion of debris into the motor; in accordance with

that alert service bulletin.

(1) If clearance is less than the limits specified in the alert

service bulletin, prior to further flight, adjust insulating

materials, ducting, and/or looms to ensure that contact with other

equipment is avoided; in accordance with the alert service bulletin.

(2) If any sign of overheating or ingestion of debris into the

motor is detected, prior to further flight, replace the fan venturi,

and any adjacent equipment (including cables) that shows signs of

overheating, with serviceable parts; in accordance with the alert

service bulletin.

(3) If any sign of degradation of insulation materials is

detected, prior to further flight, replace the insulating material

with serviceable parts in accordance with the service bulletin.

(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 inspections, adjustments, and replacements shall be done

in accordance with Raytheon Corporate Jets Alert Service Bulletin SB

21-A150, dated February 22, 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 June 10, 1994.

Issued in Renton, Washington, on May 18, 1994.

Darrell M. Pederson,

Acting Manager, Transport Airplane Directorate, Aircraft Certification

Service.

[FR Doc. 94-12600 Filed 5-25-94; 8:45 am]

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