AD 90-21-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Dornier Luftfahrt GmbH | Do 28 D | Airworthiness Directives; DORNIER Models Do28D and Do28D-1 Airplanes |
| aircraft | Dornier Luftfahrt GmbH | Do 28 D-1 | Airworthiness Directives; DORNIER Models Do28D and Do28D-1 Airplanes |
Unsafe Condition
Engine mount failure due to loose or damaged rivets at the riveted connections between the L-section and formed sheet of the right-hand and left-hand engine mounts.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 50 hours time-in-service after the effective date, visually inspect the riveted connections. If loose or damaged rivets are found, remove and replace damaged rivets, replace 3.2mm universal/Huck blind rivets with 4.0mm steel blind rivets per Dornier Service Bulletin 1131-1613, and reinspect every 100 hours TIS. If no issues, reinspect every 100 hours TIS.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 50 hours time-in-service after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Dornier Luftfahrt GmbH Models Do28D and Do28D-1 (all serial numbers)
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Engine Mount
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_90-21-06.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 90-21-06 Document Type: AD Final Rules Docket Number: 90-CE-24-AD Subject Heading: Airworthiness Directives; DORNIER Models Do28D and Do28D-1 Airplanes Subject: Engine Mount Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 11/13/1990 Make: Dornier Luftfahrt GmbH Model: Do 28 D | Do 28 D-1 Product Type: Aircraft Product Subtype: Small/Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 90-21-06 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 90-CE-24-AD AMENDMENT: 39-6755 AD NUMBER: 90-21-06 SUBJECT HEADING: Airworthiness Directives; DORNIER Models Do28D and Do28D-1 Airplanes ACTION: SUMMARY: DATES: Effective November 13, 1990. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 90-21-06 DORNIER: Amendment 39-6755. Docket No. 90-CE-24-AD. Applicability: Models Do28D and Do28D-1 (all serial numbers) airplanes, certificated in any category. Compliance: Required as indicated in the body of the AD, unless already accomplished. To prevent engine mount failure, accomplish the following: (a) Within the next 50 hours time-in-service (TIS) after the effective date of this AD visually inspect the riveted connections between the L-section and formed sheet of the right-hand and left-hand engine mounts. (1) If no loose or damaged rivets are found, reinspect the connections at intervals of 100 hours TIS thereafter. (2) If any loose or damaged rivets are found, prior to further flight remove and replace any damaged rivets, and replace all universal and Huck blind rivets having a diameter of 3.2mm (.126 in) with steel blind rivets having a diameter of 4.0mm in accordance with the instructions contained in Dornier Service Bulletin No. 1131-1613, dated August 2, 1989. Reinspect the connections at intervals of 100 hours TIS thereafter. (b) Airplanes may be flown in accordance with FAR 21.197 to a location were this AD may be accomplished. (c) An alternate method of compliance or adjustment of the initial or repetitive compliance times, which provides an equivalent level of safety, may be approved by the Manager, Aircraft Certification Staff, Europe, Africa, and Middle East Office, FAA, c/o American Embassy, 1000 Brussels, Belgium. NOTE: The request should be forwarded through an FAA Maintenance Inspector, who may add comments and then send it to the Manager, Brussels Aircraft Certification Staff. All persons affected by this directive may obtain copies of the document referred to herein upon request to Dornier Luftfahrt GmbH, P.O. Box D-8031 Wessling, Federal Republic of Germany; or may examine this document at the FAA, Central Region, Office of the Assistant Chief Counsel, Room 1558, 601 E. 12th Street, Kansas City, Missouri 64106. This amendment (39-6755, AD 90-21-06) becomes effective on November 13, 1990. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_90-21-06.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 90-21-06 Document Type: AD Final Rules Docket Number: 90-CE-24-AD Subject Heading: Airworthiness Directives; DORNIER Models Do28D and Do28D-1 Airplanes Subject: Engine Mount Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 11/13/1990 Make: Dornier Luftfahrt GmbH Model: Do 28 D | Do 28 D-1 Product Type: Aircraft Product Subtype: Small/Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 90-21-06 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 90-CE-24-AD AMENDMENT: 39-6755 AD NUMBER: 90-21-06 SUBJECT HEADING: Airworthiness Directives; DORNIER Models Do28D and Do28D-1 Airplanes ACTION: SUMMARY: DATES: Effective November 13, 1990. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 90-21-06 DORNIER: Amendment 39-6755. Docket No. 90-CE-24-AD. Applicability: Models Do28D and Do28D-1 (all serial numbers) airplanes, certificated in any category. Compliance: Required as indicated in the body of the AD, unless already accomplished. To prevent engine mount failure, accomplish the following: (a) Within the next 50 hours time-in-service (TIS) after the effective date of this AD visually inspect the riveted connections between the L-section and formed sheet of the right-hand and left-hand engine mounts. (1) If no loose or damaged rivets are found, reinspect the connections at intervals of 100 hours TIS thereafter. (2) If any loose or damaged rivets are found, prior to further flight remove and replace any damaged rivets, and replace all universal and Huck blind rivets having a diameter of 3.2mm (.126 in) with steel blind rivets having a diameter of 4.0mm in accordance with the instructions contained in Dornier Service Bulletin No. 1131-1613, dated August 2, 1989. Reinspect the connections at intervals of 100 hours TIS thereafter. (b) Airplanes may be flown in accordance with FAR 21.197 to a location were this AD may be accomplished. (c) An alternate method of compliance or adjustment of the initial or repetitive compliance times, which provides an equivalent level of safety, may be approved by the Manager, Aircraft Certification Staff, Europe, Africa, and Middle East Office, FAA, c/o American Embassy, 1000 Brussels, Belgium. NOTE: The request should be forwarded through an FAA Maintenance Inspector, who may add comments and then send it to the Manager, Brussels Aircraft Certification Staff. All persons affected by this directive may obtain copies of the document referred to herein upon request to Dornier Luftfahrt GmbH, P.O. Box D-8031 Wessling, Federal Republic of Germany; or may examine this document at the FAA, Central Region, Office of the Assistant Chief Counsel, Room 1558, 601 E. 12th Street, Kansas City, Missouri 64106. This amendment (39-6755, AD 90-21-06) becomes effective on November 13, 1990. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.
Related Airworthiness Directives
89-04-04
final ruleAirworthiness Directives; DORNIER Model Do-28 D-1 Airplanes
Unsafe Condition: Failure to inspect and correctly locate the Center of Gravity Station Guide Line could result in operation beyond the approved forward or rear center of gravity limits.
89-03-15
final ruleAirworthiness Directives; DORNIER Models Do28 D and Do28 D-1 Airplanes
Unsafe Condition: Loose rivets in the horizontal tail bearing fittings and lateral skins and cracks in the rear fuselage frame 10420 and corner gusset could lead to loss of the horizontal tail.
77-14-17 R1
final ruleAirworthiness Directives; Dornier GmbH Model Do 27 and Do 28 Series Airplanes
Unsafe Condition: Defective DORNIER fuel and oil hoses manufactured to specification LN9226 may lead to possible engine failure or sudden seizure of an engine.
82-26-04
final ruleAirworthiness Directives; DORNIER Model DO28D-1 Airplanes
Unsafe Condition: Restriction of control movement due to jamming of the ARC PA-500A actuator gear train.