04-8220. Airworthiness Directives; Glaser-Dirks Flugzeugbau GmbH Model DG-800B Sailplanes

AGENCY:

Federal Aviation Administration (FAA), DOT.

ACTION:

Notice of proposed rulemaking (NPRM).

SUMMARY:

The FAA proposes to adopt a new airworthiness directive (AD) for all Glaser-Dirks Flugzeugbau GmbH (DG Flugzeugbau) Model DG-800B sailplanes equipped with engine SOLO 2625 or Mid-West AE 50T. This proposed AD would require you to modify the coolant pump and fuel pump electrical circuits, replace the non-resettable circuit breaker with a resettable circuit breaker, and (for a version of the Mikuni carburetor) secure the choke butterfly valve axis. This proposed AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Germany. We are issuing this proposed AD to prevent fuel pump electrical failure if a non-resettable circuit breaker trips. This could result in power loss with the inability to restart the fuel pump during a critical phase of flight (for example, takeoff under own power).

DATES:

We must receive any comments on this proposed AD by May 24, 2004.

ADDRESSES:

Use one of the following to submit comments on this proposed AD:

• By mail: FAA, Central Region, Office of the Regional Counsel, Attention: Rules Docket No. 2003-CE-65-AD, 901 Locust, Room 506, Kansas City, Missouri 64106.
• By fax: [phone].
• By e-mail: [e-mail]. Comments sent electronically must contain “Docket No. 2003-CE-65-AD” in the subject line. If you send comments electronically as attached electronic files, the files must be formatted in Microsoft Word 97 for Windows or ASCII.

You may get the service information identified in this proposed AD from DG Flugzeugbau, Postbox 41 20, D-76625 Bruchsal, Federal Republic of Germany; telephone: [phone]; facsimile: 011-49 7257-8922.

You may view the AD docket at FAA, Central Region, Office of the Regional Counsel, Attention: Rules Docket No. 2003-CE-65-AD, 901 Locust, Room 506, Kansas City, Missouri 64106. Office hours are 8 a.m. to 4 p.m., Monday through Friday, except Federal holidays.

FOR FURTHER INFORMATION CONTACT:

Greg Davison, Aerospace Engineer, FAA, Small Airplane Directorate, 901 Locust, Room 301, Kansas City, Missouri 64106; telephone: [phone]; facsimile: [phone].

SUPPLEMENTARY INFORMATION:

Comments Invited

How Do I Comment on This Proposed AD?

We invite you to submit any written relevant data, views, or arguments regarding this proposal. Send your comments to an address listed under ADDRESSES. Include “AD Docket No. 2003-CE-65-AD” in the subject line of your comments. If you want us to acknowledge receipt of your mailed comments, send us a self-addressed, stamped postcard with the docket number written on it. We will date-stamp your postcard and mail it back to you.

Are There Any Specific Portions of This Proposed AD I Should Pay Attention To?

We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of this proposed AD. If you contact us through a nonwritten communication and that contact relates to a substantive part of this proposed AD, we will summarize the contact and place the summary in the docket. We will consider all comments received by the closing date and may amend this proposed AD in light of those comments and contacts.

Discussion

What Events Have Caused This Proposed AD?

The Luftfahrt-Bundesamt (LBA), which is the airworthiness authority for Germany, recently notified FAA that an unsafe condition may exist on DG Flugzeugbau Model DG-800B sailplanes. The LBA reports both electrical circuits of the fuel pump and the coolant pump (on engine SOLO 2625 or Mid-West AE 50T) are protected by a non-resettable digital engine indicator (DEI) circuit breaker. The pumps will stop running if the non-resettable circuit breaker activates.

What Are the Consequences if the Condition Is Not Corrected?

If a non-resettable circuit breaker trips, this could result in power loss with the inability to restart the fuel pump during a critical phase of flight (for example, takeoff under own power).

Is There Service Information That Applies to This Subject?

DG Flugzeugbau has issued:

—Technical Note No. 873/26, dated November 12, 2001; and

—Technical Note No. 873/27, dated November 29, 2001.

What Are the Provisions of This Service Information?

The service bulletins include procedures for:

—Modifying the coolant pump and fuel pump electrical circuits;

—Replacing the non-resettable circuit breaker with a resettable circuit breaker; and

—Securing the choke butterfly valve axis for a version of the Mikuni carburetor.

What Action Did the LBA Take?

The LBA classified these service bulletins as mandatory and issued German AD Number 2002-083, dated April 4, 2002, to ensure the continued airworthiness of these sailplanes in Germany.

Did the LBA Inform the United States Under the Bilateral Airworthiness Agreement?

These DG Flugzeugbau Model DG-800B sailplanes are manufactured in Germany and are type-certificated for operation in the United States under the provisions of section 21.29 of the Federal Aviation Regulations (14 CFR 21.29) and the applicable bilateral airworthiness agreement.

Under this bilateral airworthiness agreement, the LBA has kept us informed of the situation described above.

FAA's Determination and Requirements of This Proposed AD

What Has FAA Decided?

We have examined the LBA's findings, 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 the unsafe condition described previously is likely to exist or develop on other DG Flugzeugbau Model DG-800B sailplanes of the same type design that are registered in the United States, we are proposing AD action to prevent fuel pump electrical failure if a non-resettable circuit breaker trips. This could result in power loss with the inability to restart the fuel pump during a critical phase of flight (for example, takeoff under own power).

What Would This Proposed AD Require?

This proposed AD would require you to incorporate the actions in the previously-referenced service bulletins.

How Does the Revision to 14 CFR Part 39 Affect This Proposed AD?

On July 10, 2002, we published a new version of 14 CFR part 39 (67 FR 47997, July 22, 2002), which governs FAA's AD system. This regulation now includes material that relates to altered products, special flight permits, and alternative methods of compliance. This material previously was included in each individual AD. Since this material is included in 14 CFR part 39, we will not include it in future AD actions.

Costs of Compliance

How Many Sailplanes Would This Proposed AD Impact?

We estimate that this proposed AD affects 25 sailplanes in the U.S. registry.

What Would Be the Cost Impact of This Proposed AD on Owners/Operators of the Affected Sailplanes?

We estimate the following costs to accomplish this proposed modification:

Labor cost	Parts cost	Total cost per sailplane	Total cost on U.S. operators
6 workhours at $65 per hour = $390	$100	$490	25 × $490 = $12,250.

Regulatory Findings

Would This Proposed AD Impact Various Entities?

We have determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would 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.

Would This Proposed AD Involve a Significant Rule or Regulatory Action?

For the reasons discussed above, I certify that this proposed AD:

1. Is not a “significant regulatory action” under Executive Order 12866;

2. Is not a “significant rule” under the 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.

We prepared a summary of the costs to comply with this proposed AD and placed it in the AD Docket. You may get a copy of this summary by sending a request to us at the address listed under ADDRESSES. Include “AD Docket No. 2003-CE-65-AD” in your request.

List of Subjects in 14 CFR Part 39

• Air transportation
• Aircraft
• Aviation safety
• Safety

The Proposed Amendment

Accordingly, under the authority delegated to me by the Administrator, the Federal Aviation Administration proposes to amend 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. The FAA amends § 39.13 by adding the following new airworthiness directive (AD):

Glaser-Dirks Flugzeugbau GmbH: Docket No. 2003-CE-65-AD.

When Is the Last Date I Can Submit Comments on This Proposed AD?

(a) We must receive comments on this proposed airworthiness directive (AD) by May 24, 2004.

What Other ADs Are Affected by This Action?

(b) None.

What Sailplanes Are Affected by This AD?

(c) This AD affects all Model DG-800B sailplanes, all serial numbers, that are:

(1) certificated in any category; and

(2) equipped with engine SOLO 2625 or Mid-West AE 50T.

What Is the Unsafe Condition Presented in This AD?

(d) This AD is the result mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Germany. The actions specified in this AD are intended to prevent fuel pump electrical failure if a non-resettable circuit breaker trips. This could result in power loss with the inability to restart the fuel pump during a critical phase of flight (for example, takeoff under own power).

What Must I Do To Address This Problem?

(e) To address this problem, you must do the following:

Actions	Compliance	Procedures
(1) Modify the coolant pump and fuel pump electrical circuits	Within the next 50 hours time-in-service (TIS) after the effective date of this AD, unless already done	For sailplanes with engine SOLO 2625: Follow DG Flugzeugbau GmbH Technical Note No. 873/26, dated November 12, 2001; For sailplanes with engine Mid-West AE 50T: Follow DG Flugzeugbau GmbH Technical Note No. 873/27, dated November 29, 2001.
(2) Remove the non-resettable digital engine indicator (DEI) circuit breaker (4-ampere) and replace with a resettable 5-ampere circuit breaker	Before further flight after the modification of the coolant pump and fuel pump electrical circuits required by paragraph (e)(1) of this AD	For sailplanes with engine SOLO 2625: Follow DG Flugzeugbau GmbH Technical Note No. 873/26, dated November 12, 2001; For sailplanes with engine Mid-West AE 50T: Follow DG Flugzeugbau GmbH Technical Note No. 873/27, dated November 29, 2001.
(3) For sailplanes with engine SOLO 2625 (New version Mikuni carburetor): Secure the choke butterfly valve axis	Before further flight after the modification of the coolant pump and fuel pump electrical circuits required by paragraph (e)(1) of this AD and the removal and replacement required by paragraph (e)(2) of this AD	For sailplanes with engine SOLO 2625: Follow DG Flugzeugbau GmbH Technical Note No. 873/26, dated November 12, 2001.
(4) Do not install any engine SOLO 2625 or Mid-West AE 50T unless the modifications required by paragraphs (e)(1), (e)(2), and (e)(3) have been done	As of the effective date of this AD	Not Applicable.

May I Request an Alternative Method of Compliance?

(f) You may request a different method of compliance or a different compliance time for this AD by following the procedures in 14 CFR 39.19. Unless FAA authorizes otherwise, send your request to your principal inspector. The principal inspector may add comments and will send your request to the Manager, Standards Office, Small Airplane Directorate, FAA. For information on any already approved alternative methods of compliance, contact Greg Davison, Aerospace Engineer, FAA, Small Airplane Directorate, 901 Locust, Room 301, Kansas City, Missouri 64106; telephone: [phone]; facsimile: [phone].

May I Get Copies of the Documents Referenced in This AD?

(g) You may get copies of the documents referenced in this AD from DG Flugzeugbau, Postbox 41 20, D-76625 Bruchsal, Federal Republic of Germany; telephone: [phone]; facsimile: 011-49 7257-8922. You may view these documents at FAA, Central Region, Office of the Regional Counsel, 901 Locust, Room 506, Kansas City, Missouri 64106.

Is There Other Information That Relates to This Subject?

(h) German AD Number 2002-083, dated April 4, 2002, also addresses the subject of this AD.

Issued in Kansas City, Missouri, on April 5, 2004.

Dorenda D. Baker,

Manager, Small Airplane Directorate, Aircraft Certification Service.