- Effective
- July 7, 2009
- Published
- June 2, 2009 · 74 FR 26291–26293
- Issued
- May 20, 2009
- Model
- MD-90-30
- Data sheet
- TCDSA6WE
- Registered aircraft
- 5 matched by model
- Product
- Aircraft · Large airplane
- ATA chapter
- 28 · Fuel
- Amendment
- 39-15921
- Docket
- FAA-2009-0213
- Project
- 2008-NM-224-AD
- Issued as
- Final rule
Unofficial copy from the Federal Register XML, document E9-12521. Only the govinfo PDF is the legal edition. DRS record last changed May 30, 2024.
Copies of the files this page was built from, with their SHA-256. Retrieved October 18, 2026.
| File | Size | SHA-256 | Original |
|---|---|---|---|
| Official PDF | 150 KB | 04e7185f…dbcd95b | E9-12521.pdf on govinfo.gov |
| Federal Register XML | 15 KB | edd4428c…52254e4 | E9-12521.xml on federalregister.gov |
| FAA DRS HTML attachment | 48 KB | 0781c8fe…447c416 | FAA DRS (API key needed) |
| FAA DRS PDF | 29 KB | cc54662a…6e4f3e9 | FAA DRS (API key needed) |
On this page
Summary
We are adopting a new airworthiness directive (AD) for certain McDonnell Douglas Model MD-90-30 airplanes. This AD requires installing fuses and wire protection in certain wing and fuel tank spars. This AD results from fuel system reviews conducted by the manufacturer. We are issuing this AD to prevent possible damage to the fuel level float or pressure switch wires. Such damage could become a potential ignition source inside the fuel tank, and, when combined with flammable fuel vapors, could result in a fuel tank explosion and consequent loss of the airplane.
The airworthiness directive
2009-11-11 McDonnell Douglas: Amendment 39-15921. Docket No. FAA-2009-0213; Directorate Identifier 2008-NM-224-AD.
(a) Effective Date
PDF page 2(a) This airworthiness directive (AD) is effective July 7, 2009.
(b) Affected ADs
PDF page 2(b) None.
(c) Applicability
PDF page 2(c) This AD applies to McDonnell Douglas Model MD-90-30 airplanes, certificated in any category, excluding fuselage number 2159.
(d) Subject
PDF page 2(d) Air Transport Association (ATA) of America Code 28: Fuel.
(e) Unsafe Condition
PDF page 2(e) This AD results from fuel system reviews conducted by the manufacturer. We are issuing this AD to prevent possible damage to the fuel level float or pressure switch wires. Such damage could become a potential ignition source inside the fuel tank, and, when combined with flammable fuel vapors, could result in a fuel tank explosion and consequent loss of the airplane.
(f) Compliance
PDF page 2(f) You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
(g) Installation
PDF page 3(g) Within 5 years after the effective date of this AD, do the actions specified in paragraph (g)(1) or (g)(2) of this AD, as applicable, in accordance with the Accomplishment Instructions of Boeing Service Bulletin MD90-28-012, dated November 19, 2008 (“the service bulletin”).
(1) For Group 1 airplanes identified in the service bulletin, install fuel level float switch in-line fuses and wire protection in the left and right wing forward spars and center fuel tank forward spar, right side.
(2) For Group 2 airplanes identified in the service bulletin, install fuel level float switch in-line fuses and wire protection in the left and right wing forward spars, center fuel tank forward spar, right side, and forward auxiliary fuel tank, right side; and install a fuel pressure switch in-line fuse and wire protection in the center fuel tank forward spar, left side.
(h) Alternative Methods of Compliance (AMOCs)
PDF page 3(h)(1) The Manager, Los Angeles Aircraft Certification Office (ACO), FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Send information to Attn: Samuel Lee, Aerospace Engineer, Propulsion Branch, ANM-140L, FAA, Los Angeles ACO, 3960 Paramount Boulevard, Lakewood, California 90712-4137; telephone (562) 627-5262; fax (562) 627-5210.
(2) To request a different method of compliance or a different compliance time for this AD, follow the procedures in 14 CFR 39.19. Before using any approved AMOC on any airplane to which the AMOC applies, notify your principal maintenance inspector (PMI) or principal avionics inspector (PAI), as appropriate, or lacking a principal inspector, your local Flight Standards District Office. The AMOC approval letter must specifically reference this AD.
(i) Material Incorporated by Reference
PDF page 3(i) You must use Boeing Service Bulletin MD90-28-012, dated November 19, 2008, to do the actions required by this AD, unless the AD specifies otherwise.
(1) The Director of the Federal Register approved the incorporation by reference of this service information under 5 U.S.C. 552(a) and 1 CFR part 51.
(2) For service information identified in this AD, contact Boeing Commercial Airplanes, Attention: Data & Services Management, 3855 Lakewood Boulevard, MC D800-0019, Long Beach, California 90846-0001; telephone 206-544-5000, extension 2; fax 206-766-5683; e-mail dse.boecom@boeing.com; Internet https://www.myboeingfleet.com.
(3) You may review copies of the service information at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington. For information on the availability of this material at the FAA, call 425-227-1221 or 425-227-1152.
(4) You may also review copies of the service information that is incorporated by reference at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html.
Rule preamble
The FAA’s background, reasoning and cost estimate, published with the AD.
DatesPage 1
This AD is effective July 7, 2009.
The Director of the Federal Register approved the incorporation by reference of a certain publication listed in the AD as of July 7, 2009.
AddressesPage 1
For service information identified in this AD, contact Boeing Commercial Airplanes, Attention: Data & Services Management, 3855 Lakewood Boulevard, MC D800-0019, Long Beach, California 90846-0001; telephone 206-544-5000, extension 2; fax 206-766-5683; e-mail dse.boecom@boeing.com; Internet https://www.myboeingfleet.com.
For further information contactPage 2
Samuel Lee, Aerospace Engineer, Propulsion Branch, ANM-140L, FAA, Los Angeles Aircraft Certification Office, 3960 Paramount Boulevard, Lakewood, California 90712-4137; telephone (562) 627-5262; fax (562) 627-5210.
DiscussionPage 2
We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 to include an airworthiness directive (AD) that would apply to certain McDonnell Douglas Model MD-90-30 airplanes. That NPRM was published in the Federal Register on March 10, 2009 (74 FR 10202). That NPRM proposed to require installing fuses and wire protection in certain wing and fuel tank spars.
CommentsPage 2
We gave the public the opportunity to participate in developing this AD. We received no comments on the NPRM or on the determination of the cost to the public.
ConclusionPage 2
We reviewed the relevant data and determined that air safety and the public interest require adopting the AD as proposed.
Costs of CompliancePage 2
We estimate that this AD will affect 15 airplanes of U.S. registry. The following table provides the estimated costs for U.S. operators to comply with this AD.
| Action | Work hours | Average labor rate per hour | Parts | Cost per product | Number of U.S.-registered airplanes | Fleet cost |
|---|---|---|---|---|---|---|
| Installation, depending on group | 20 or 26 | $80 | $1,132 or $1,822 | $2,732 or $3,902 | 15 | $40,980 to $58,530. |
Authority for This RulemakingPage 2
Title 49 of the United States Code specifies the FAA's authority to issue rules on aviation safety. Subtitle I, section 106, describes the authority of the FAA Administrator. “Subtitle VII: Aviation Programs,” describes in more detail the scope of the Agency's authority.
We are issuing this rulemaking under the authority described in “Subtitle VII, Part A, Subpart III, Section 44701: General requirements.” Under that section, Congress charges the FAA with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce. This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action.
Regulatory findingsPage 2
This AD will not have federalism implications under Executive Order 13132. This AD 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.
For the reasons discussed above, I certify that this AD:
(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.
You can find our regulatory evaluation and the estimated costs of compliance in the AD Docket.
Adoption of the amendmentPage 2
Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows:
1. The authority citation for part 39 continues to read as follows:
2. The FAA amends § 39.13 by adding the following new AD:
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 5
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1995 | 1 |
|---|---|
| 1996 | 2 |
| 1998 | 1 |
| 1999 | 1 |