Airworthiness Directives; Raytheon Model BAe.125 Series 1000A and 1000B Airplanes and Model Hawker 1000 Series Airplanes

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 99-NM-80-AD; Amendment 39-11499; AD 2000-01-02]

RIN 2120-AA64

Airworthiness Directives; Raytheon Model BAe.125 Series 1000A and

1000B Airplanes and Model Hawker 1000 Series Airplanes

AGENCY: Federal Aviation Administration, DOT.

ACTION: Final rule.

-----------------------------------------------------------------------

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

applicable to all Raytheon Model BAe.125 series 1000A and 1000B

airplanes and Model Hawker 1000 series airplanes, that requires an

inspection to determine the integrity of the duct connection on both

ends of the turbine air discharge duct in the air conditioning system;

an inspection to measure the bead height on the ends of the turbine air

discharge duct; and corrective actions, if necessary. This amendment is

prompted by reports indicating that the turbine air discharge duct

disconnected from the cold air unit (CAU) or water separator due to

insufficient bead height on the ends of the turbine air discharge duct.

The actions specified by this AD are intended to prevent such

disconnection from the CAU or water separator, which could result in

cabin depressurization.

DATES: Effective February 15, 2000.

The incorporation by reference of certain publications listed in

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

of February 15, 2000.

ADDRESSES: The service information referenced in this AD 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 Federal Aviation

Administration (FAA), Transport Airplane Directorate, Rules Docket,

1601 Lind Avenue, SW., Renton, Washington; or at the FAA, Small

Airplane Directorate, Wichita Aircraft Certification Office, 1801

Airport Road, Room 100, Mid-Continent Airport, Wichita, Kansas; or at

the Office of the Federal Register, 800 North Capitol Street, NW.,

suite 700, Washington, DC.

FOR FURTHER INFORMATION CONTACT: Paul C. DeVore, Aerospace Engineer,

Systems and Propulsion Branch, ACE-116W, FAA, Small Airplane

Directorate, Wichita Aircraft Certification Office, 1801 Airport Road,

Room 100, Mid-Continent Airport, Wichita, Kansas

[[Page 1539]]

67209; telephone (316) 946-4142; fax (316) 946-4407.

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 all Raytheon Model BAe.125 series

1000A and 1000B airplanes and Model Hawker 1000 series airplanes was

published in the Federal Register on October 14, 1999 (64 FR 55638).

That action proposed to require an inspection to determine the

integrity of the duct connection on both ends of the turbine air

discharge duct in the air conditioning system; an inspection to measure

the bead height on the ends of the turbine air discharge duct; and

corrective actions, if necessary.

Comments

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.

Conclusion

The FAA has determined that air safety and the public interest

require the adoption of the rule as proposed.

Cost Impact

There are approximately 52 airplanes of the affected design in the

worldwide fleet. The FAA estimates that 35 airplanes of U.S. registry

will be affected by this AD, that it will take approximately 9 work

hours per airplane to accomplish the required actions, and that the

average labor rate is $60 per work hour. Based on these figures, the

cost impact of the AD on U.S. operators is estimated to be $18,900, or

$540 per airplane.

The 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.

Regulatory Impact

The regulations adopted herein will not have a substantial direct

effect 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, it

is determined that this final rule does not have federalism

implications under Executive Order 13132.

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. 106(g), 40113, 44701.

Sec. 39.13 [Amended]

2. Section 39.13 is amended by adding the following new

airworthiness directive:

2000-01-02 Raytheon Aircraft Company (Formerly Beech): Amendment 39-

11499. Docket 99-NM-80-AD.

Applicability: All Model BAe.125 series 1000A and 1000B

airplanes and Model Hawker 1000 series airplanes, certificated in

any category.

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 (d) 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 the turbine air discharge duct in the air

conditioning system from disconnecting from the CAU or water

separator in flight, which could result in cabin depressurization,

accomplish the following:

Inspections

(a) Within 25 flight hours after the effective date of this AD,

perform a general visual inspection to determine the integrity of

the duct connections (i.e., ensure that the duct and securing clamps

are in place, the sleeve is central to the joint gap, and the clamps

are clear of the duct bead) on both ends of the turbine air

discharge duct in accordance with Raytheon Service Bulletin SB 21-

3108, dated November 1998. If any discrepancy is detected, prior to

further flight, adjust the clamps in accordance with the service

bulletin.

Note 2: For the purposes of this AD, a general visual inspection

is defined as: ``A visual examination of an interior or exterior

area, installation, or assembly to detect obvious damage, failure,

or irregularity. This level of inspection is made under normally

available lighting conditions such as daylight, hangar lighting,

flashlight, or drop-light, and may require removal or opening of

access panels or doors. Stands, ladders, or platforms may be

required to gain proximity to the area being checked.''

(b) Within 300 flight hours or 6 months after the effective date

of this AD, whichever occurs first, perform a one-time detailed

inspection to measure the bead height on the ends of the turbine air

discharge duct in accordance with Raytheon Service Bulletin SB 21-

3108, dated November 1998. If the bead height does not conform to

the dimension shown in the service bulletin, prior to further

flight, either rework the duct or replace the duct with a new duct,

in accordance with the service bulletin.

Note 3: For the purposes of this AD, a detailed inspection is

defined as: ``An intensive visual examination of a specific

structural area, system, installation, or assembly to detect damage,

failure, or irregularity. Available lighting is normally

supplemented with a direct source of good lighting at intensity

deemed appropriate by the inspector. Inspection aids such as mirror,

magnifying lenses, etc., may be used. Surface cleaning and elaborate

access procedures may be required.''

Spares

(c) As of the effective date of this AD, no person shall install

a turbine air discharge duct, part number 25-9VF425-1A, on any

airplane, unless that duct has been inspected in accordance with

Part II of Raytheon Service Bulletin SB 21-3108, dated November

1998.

Alternative Methods of Compliance

(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, Wichita Aircraft Certification

Office (ACO), FAA, Small 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, Wichita ACO.

Note 4: Information concerning the existence of approved

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

obtained from the Wichita ACO.

[[Page 1540]]

Special Flight Permits

(e) Special flight permits may be issued in accordance with

Secs. 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.

Incorporation by Reference

(f) The actions shall be done in accordance with Raytheon

Service Bulletin SB 21-3108, dated November 1998. 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 Aircraft Company, Manager Service

Engineering, Hawker Customer Support Department, P.O. Box 85,

Wichita, Kansas 67201-0085. Copies may be inspected at the FAA,

Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton,

Washington; or at the FAA, Small Airplane Directorate, Wichita

Aircraft Certification Office, 1801 Airport Road, Room 100, Mid-

Continent Airport, Wichita, Kansas; or at the Office of the Federal

Register, 800 North Capitol Street, NW., suite 700, Washington, DC.

(g) This amendment becomes effective on February 15, 2000.

Issued in Renton, Washington, on January 3, 2000.

Donald L. Riggin,

Acting Manager, Transport Airplane Directorate, Aircraft Certification

Service.

[FR Doc. 00-375 Filed 1-10-00; 8:45 am]

BILLING CODE 4910-13-U