AD 2001-05-01

This amendment adopts a new airworthiness directive (AD) that applies to certain DG Flugzeugbau GmbH (DG Flugzeugbau) Model DG-500MB sailplanes equipped with a SOLO 2625 02 engine. This AD requires you to install additional access holes in the propeller mount and modify the engine. This AD also requires you to do a ground test run and replace the digital engine indicator circuit breaker. This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for the Federal Republic of Germany. The actions specified by this AD are intended to correct an inadequate circuit breaker and unsatisfactory drive belt tension that could cause damage to the engine crankshaft. Such damage could lead to engine failure and loss of control of the sailplane.

Final rule

2001-05-01 DG FLUGZEUGBAU GMBH: Amendment 39-12137; Docket No. 99-CE-89-AD.

(a) What sailplanes are affected by this AD? This AD affects Model DG-500MB sailplanes, all serial numbers equipped with a SOLO 2625 02 engine, that are certificated in any category.

(b) Who must comply with this AD? Anyone who wishes to operate any of the above sailplanes must comply with this AD.

(c) What problem does this AD address? The actions specified by this AD are intended to correct an inadequate circuit breaker and unsatisfactory drive belt tension that could cause damage to the engine crankshaft. Such damage could lead to engine failure and loss of control of the sailplane.

(d) What actions must I accomplish to address this problem? To address this problem, you must accomplish the following:

Actions
Compliance
Procedures
(1) Remove the engine from the propeller mount.
Within the next 25 hours
time-in-service (TIS) after
April 27, 2001 (the effectivedate of this AD).
In accordance with the
maintenance manual. Ship
engine to the engine
manufacturer, SOLO, or a
licensed repair station, for
modification according to the
SOLO Technical Note (TN)
4600-1.
(2) Install additional access holes in the propeller mount.
Before further flight after
removing the engine and
before installing the modified
engine to the propeller mount.
In accordance with drawing
5M102 of DG Flugzeugbau
Technical Note 843/13, dated
November 3, 1999.
(3) Install the modified engine to the propeller mount.
Before further flight after
removing the engine and
after the engine modification
In accordance with the
maintenance manual.
(4) Do a ground test run.
Before further flight after the
previous action.
In accordance with DG
Flugzeugbau Technical Note
843/13, dated November 3,
1999.
(5) Replace the digital engine
indicator (DEI) circuit breaker
with a new 5 ampere Klixon 7277-2-5A circuit breaker (or FAA-approved equivalent part number).
Before further flight after the
previous actions.
In accordance with DG
Flugzeugbau Technical Note
843/13, dated November 3,
1999.
(6) Do not install any engine that
has not been modified following
SOLO TN 4600-1.
As of April 27, 2001 (the
effective date of this AD).
Not Applicable.
(7) Do not install any DEI circuit breaker that is not a 5 ampere Klixon 7277-2-5A circuit breaker (or FAA-approved equivalent part number).
As of April 27, 2001 (the
effective date of this AD).

Not Applicable.

(e) Can I comply with this AD in any other way? You may use an alternative method of compliance or adjust the compliance time if:

(1) Your alternative method of compliance provides an equivalent level of safety; and

(2) The Manager, Small Airplane Directorate, approves your alternative. Submit your request through an FAA Principal Maintenance Inspector, who may add comments and thensend it to the Manager, Small Airplane Directorate.

Note 1: This AD applies to each sailplane identified in paragraph (a) of this AD, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For sailplanes 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 you have not eliminated the unsafe condition, specific actions you propose to address it.

(f) Where can I get information about any already-approved alternative methods of compliance? Contact Mike Kiesov, Aerospace Engineer, FAA, Small Airplane Directorate, 901 Locust, Room 301, Kansas City, Missouri 64106; telephone: (816) 329-4144; facsimile: (816) 329-4090.

(g) What if I need to fly the sailplane to another location to comply with this AD? The FAA can issue a special flight permit under sections 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate your sailplane to a location where you can accomplish the requirements of this AD.

(h) Are any service bulletins incorporated into this AD by reference? Actions required by this AD must be done in accordance with DG Flugzeugbau GmbH Technical Note No. 843/13, dated November 3, 1999. The Director of the Federal Register approved this incorporation by reference under 5 U.S.C. 552(a) and 1 CFR part 51. You can get copies from DG Flugzeugbau GmbH, Postbox 41 20, D-76646 Bruchsal, Federal Republic of Germany. You can look at copies at the FAA, Central Region, Office of the Regional Counsel, 901 Locust, Room 506, Kansas City, Missouri, or at the Office of the Federal Register, 800 North Capitol Street, NW, suite 700, Washington, DC.

(i) When does this amendment become effective? This amendment becomes effective on April 27, 2001.

Note 2: The subject of this AD is addressed in German AD Number 1999-383, dated December 1, 1999.

Discussion
What events have caused this AD? The Luftfahrt-Bundesamt (LBA), which is the airworthiness authority for the Federal Republic of Germany, notified FAA that an unsafe condition may exist on all DG Flugzeugbau Model DG-500MB sailplanes equipped with a SOLO 2625 02 engine. The LBA reports that the service history for the SOLO 2625 02 engine shows a need to modify the front crank shaft bearing. Additionally, the digital engine indicator circuit breaker amperage is too low for use and needs replacement.

What are the consequences if the condition is not corrected? The actions specified by this AD are intended to correct an inadequate circuit breaker and unsatisfactory drive belt tension that could cause damage to the engine crankshaft. Such damage could lead to engine failure and loss of control of the sailplane.

Has FAA taken any action to this point? We issued a proposal to amend part 39 of the Federal Aviation Regulations (14 CFR part 39) to include an AD that would apply to certain DG Flugzeugbau Model DG-500MB sailplanes equipped with a SOLO 2625 02 engine. This proposal was published in the Federal Register as a notice of proposed rulemaking (NPRM) on December 27, 2000 (65 FR 81782). The NPRM proposed to require you install additional access holes in the propeller mount and modify the engine. The NPRM also proposed to require you to do a ground test run and replace the digital engine indicator circuit breaker.

Was the public invited to comment? Interested persons were afforded an opportunity to participate in the making of this amendment. No comments were received on the proposed rule or the FAA's determination of the cost to the public.

FAA's Determination
What is FAA's final determination on this issue? After careful review of all available information related to the subject presented above, we have determined that air safety and the public interest require the adoption of the rule as proposed except for minor editorial corrections. We determined that these minor corrections:

- will not change the meaning of the AD; and
- will not add any additional burden upon the public than was already proposed.

Cost Impact
How many sailplanes does this AD impact? We estimate that this AD affects 1 sailplane in the U.S. registry.

What is the cost impact of this AD on owners/operators of the affected sailplanes? We estimate the following costs to accomplish the modification:

Labor Cost Parts Cost Total Cost Per Total Cost on U.S.
Sailplane Operators
12 workhours X $60 The manufacturer will do $720. $720 X 1 = $720.
per hour = $720. the engine modification
and provide the new
circuit breaker under
warranty.

Regulatory Impact
Does this AD impact various entities? 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.

Does this AD involve a significant rule or regulatory action? 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 copy of the final evaluation prepared for this action is contained in the Rules Docket. A copy of it maybe obtained by contacting 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, under 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. FAA amends 39.13 by adding a new AD to read as follows: