AD 2001-04-03

This amendment adopts a new airworthiness directive (AD), applicable to certain EMBRAER Model EMB-145 series airplanes, that requires inspection of the bolts on the hinge fittings that attach the spring tab and the servo tab to the rear spar of the elevators for evidence of loosening; inspection of the region of the hinge fittings on the spring tab for interference of the bonding jumpers attached to the hinge fittings with the leading edge of the spring tab; and corrective action, if necessary. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign airworthiness authority. The actions specified by this AD are intended to prevent the spring tab or the servo tab from becoming disconnected, resulting in structural failure. The action is also intended to prevent damage to the leading edge of the spring tab, which could result in loss of control of the elevator.

Final rule

2001-04-03 EMPRESA BRASILEIRA DE AERONAUTICA S.A. (EMBRAER): Amendment 39-12121. Docket 2000-NM-256-AD.

Applicability: Model EMB-145 series airplanes; serial numbers 145004 through 145103 inclusive, 145105 through 145111 inclusive, and 145113 through 145117 inclusive; 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 (e) 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 shouldinclude specific proposed actions to address it.

Compliance: Required as indicated, unless accomplished previously.

To prevent the spring tab or the servo tab from becoming disconnected, resulting in structural failure, and to prevent damage to the leading edge of the spring tab, which could result in loss of control of the elevator, accomplish the following:

Inspection

(a) Within 200 flight hours after the effective date of this AD, conduct a detailed visual inspection, as specified in paragraph (a)(1) or (a)(2) of this AD, as applicable, in accordance with the Accomplishment Instructions of EMBRAER Service Bulletin 145-55-0009, Change No. 02, dated May 19, 2000.

(1) For airplanes having serial numbers 145004 through 145055 that have not been modified in accordance with EMBRAER Service Bulletin 145-55-0009, dated April 7, 1998: Inspect the bolts attaching the spring tab and servo tab hinge fittings to the rear spar of the left-hand and right-hand elevatorsfor evidence of loosening.

(2) For airplanes having serial numbers 145004 through 145103, 145105 through 145111, and 145113 through 145117: Inspect the region of the hinge fittings on the spring tab for interference of the bonding jumper on the attaching bolts with the leading edge of the spring tab.

NOTE 2: For the purposes of this AD, a detailed visual 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."

Modification

(b) Perform follow-on corrective actions, as applicable, in accordance with EMBRAER Service Bulletin 145-55-0009, Change No. 02, dated May 19, 2000, as shown in thefollowing table:

Table 1: Follow-on Corrective Actions

If...
And...
And...
Then...
(1) No discrepancy
is found

[Reserved]

[Reserved]

Prior to further flight,
seal the bolt heads and
adjacent hinge fitting
surfaces

(i) The airplanes have
serial numbers
145004 through
145055, inclusive

The airplanes have
not been modified
in accordance
with EMBRAER
Service Bulletin
145-55-0009,
dated April 7, 1998

Prior to further flight,
accomplish Part II of
the service bulletin,
including replacing
bolts, adding washers,
and changing the
position of the lockwire
and the bonding jumpers.

(ii) The airplanes have
serial numbers 145004
through 145055,
inclusive, and 145056
through 145076,
inclusive
The airplanes have
been modified in
accordance with
EMBRAER Service
Bulletin 145-55-0009
dated April 7,1998
Prior to further flight,
accomplish Part III of
the service bulletin,
including adding
washers and changing
the position of the
lockwire and the bonding jumpers.
(2) Any loose bolt
or any interference
of the bonding
jumpers with the
leading edge of the
spring tab is found,

(iii) The airplanes
have serial numbers
145077 through
145103, inclusive;
145105 through
145111, inclusive; and
145113 through 145117,
inclusive
[Reserved]

Prior to further flight,
accomplish Part IV of
the service bulletin,
including adding
washers and changing
the position of the lockwire and the bonding jumpers.

Repetitive Inspections

(c) Repeat the detailed visual inspection specified in paragraph (a) of this AD, at intervals not to exceed 400 flight hours.

Terminating Action

(d) Within 2,000 flight hours from the effective date of this AD, accomplish Part II, III, or IV, as applicable, of the service bulletin.

Alternative Methods of Compliance

(e) 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, Atlanta Aircraft Certification Office (ACO), FAA. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Atlanta ACO.

NOTE 3: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Atlanta ACO.

Special Flight Permits

(f) 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.

Incorporation by Reference

(g) The actions shall be done in accordance with EMBRAER Service Bulletin 145-55-0009, Change No. 02, dated May 19, 2000. 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 Empresa Brasileira de Aeronautica S.A. (EMBRAER), P.O. Box 343 - CEP 12.225, Sao Jose dos Campos - SP, Brazil. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the FAA, Atlanta Aircraft Certification Office, One Crown Center, 1895 Phoenix Boulevard, suite 450, Atlanta, Georgia; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.

NOTE 4: A portion of the subject of this AD is addressed in Brazilian airworthiness directive No. 98-05-02, dated May 28, 1998.

Effective Date

(h) This amendment becomes effective on March 29, 2001.

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 EMBRAER Model EMB-145 series airplanes was published in the Federal Register on December 8, 2000 (65 FR 76950). That action proposed to require inspection of the bolts on the hinge fittings that attach the spring tab and the servo tab to the rear spar of the elevators for evidence of loosening; inspection of the region of the hinge fittings on the spring tab for interference of the bonding jumpers attached to the hinge fittings with the leading edge of the spring tab; and corrective action, 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 interestrequire the adoption of the rule as proposed.

Cost Impact
The FAA estimates that 71 airplanes of U.S. registry will be affected by this AD. The initial inspection will take 2 work hours per airplane at an average labor rate of $60 per hour. Based on these figures, the cost impact on U.S. operators of the initial inspection (Part I) specified in the AD is estimated to be $8,520, or $120 per airplane.

The cost impact on U.S. operators of follow-on actions is specified in the following table:

Cost of follow-on actions

Action
Work
Hours
Cost of
labor/airplane
Cost of
parts/airplane

Cost/airplane
Corrective action/ Part II
6
$360
$71
$431
Corrective action/ Part III
6
$360
$2
$362
Repetitive inspection/ Part IV
3
$180
$0
$180

The cost impact figures discussed above are 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 cost impact figures discussed in AD rulemaking actions represent only the time necessary to perform the specific actions actually required by the AD. These figures typically do not include incidental costs, such as the time required to gain access and close up, planning time, or time necessitated by other administrative actions.

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.

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