[Federal Register Volume 62, Number 80 (Friday, April 25, 1997)]
[Rules and Regulations]
[Pages 20093-20094]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 97-10564]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 96-NM-180-AD; Amendment 39-10001; AD 97-09-05]
RIN 2120-AA64


Airworthiness Directives; Raytheon Model BAe 125-1000A and Model 
Hawker 1000 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 all Raytheon Model BAe 125-1000A and Model Hawker 1000 
series airplanes, that requires various modifications to increase the 
size of certain existing pressure venting areas and to add additional 
venting areas. This amendment is prompted by results of a design review 
of the requirements for certification of the cabin pressurization 
system. The actions specified by this AD are intended to prevent 
inadequate venting of cabin pressure in the event of rapid 
decompression, which could cause failure or deformation of certain 
structural members, and consequent reduced controllability of the 
airplane.

DATES: Effective May 30, 1997.
    The incorporation by reference of certain publications listed in 
the regulations is approved by the Director of the Federal Register as 
of May 30, 1997.

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 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) 227-1149.

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 125-1000A 
and Model Hawker 1000 series airplanes was published in the Federal 
Register on February 12, 1997 (62 FR 6504). That action proposed to 
require:
    1. Installing a pressure relief flap in the rear luggage 
compartment of the bulkhead at frame 19;
    2. Enlarging two lightening holes and adding one new lightening 
hole in the rail web of the right seat between frames 10B and 10D, and 
removing fiberglass fill from the right support structure between frame 
8 and frame 10B; and
    3. Installing two new vent holes in the underfloor diaphragm of 
frame 10D (right hand).
    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

    The FAA estimates that 31 Model BAe 125-1000A and Model Hawker 1000 
series airplanes of U.S. registry will be affected by this AD, that it 
will take approximately 44 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 $81,840, or $2,640 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

[[Page 20094]]

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 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. 106(g), 40113, 44701.

Sec. 39.13   [Amended]

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

97-09-05  Raytheon Aircraft Company (Formerly Beech, Raytheon 
Corporate Jets, British Aerospace, Hawker Siddeley, et al): 
Amendment 39-10001. Docket 96-NM-180-AD.

    Applicability: All Model BAe 125-1000A 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 
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 (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.
    Note 2: Raytheon Model 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 Model 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 prevent inadequate venting of cabin pressure in the event of 
rapid decompression, which could cause failure or deformation of 
certain structural members, and consequent reduced controllability 
of the airplane, accomplish the following:
    (a) Within 8 months after the effective date of this AD, 
accomplish the requirements of paragraphs (a)(1), (a)(2), and (a)(3) 
of this AD.

    Note 3: The manufacturer has advised that the modifications 
required by paragraph (a)(2) and (a)(3) of this AD should be 
incorporated concurrently.

    (1) Install a pressure relief flap in the rear luggage 
compartment of the bulkhead at frame 19 (Modification No. 25A683C), 
in accordance with Raytheon Service Bulletin SB.21-151-25A683C, 
dated July 12, 1994.
    (2) Enlarge two lightening holes, and add one new lightening 
hole in the rail web of the right-hand seat between frames 10B and 
10D, and remove the fiberglass infill cover located outboard of the 
floor panels between frame 8 and frame 10B (Modification 
SB.253661B), in accordance with Raytheon Service Bulletin SB.53-81-
3661B, dated February 25, 1994.
    (3) Install two new vent holes in the underfloor diaphragm of 
frame 10D (Modification 253627A), in accordance with Raytheon 
Service Bulletin SB.53-76-3627A, dated February 25, 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 4: 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 actions shall be done in accordance with Raytheon 
Service Bulletin SB.21-151-25A683C, dated July 12, 1994; Raytheon 
Service Bulletin SB.53-81-3661B, dated February 25, 1994; and 
Raytheon Service Bulletin SB.53-76-3627A, dated February 25, 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 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 Office of the Federal Register, 800 North 
Capitol Street, NW., suite 700, Washington, DC.
    (e) This amendment becomes effective on May 30, 1997.

    Issued in Renton, Washington, on April 17, 1997.
Darrell M. Pederson,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 97-10564 Filed 4-24-97; 8:45 am]
BILLING CODE 4910-13-U