AD 90-25-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-9-81 (MD-81) | Airworthiness Directives; McDONNELL DOUGLAS DC-9-81, -82, -83 and -87 (MD-81, -82, -83, and -87) Series Airplanes, and Model MD-88 Series Airplanes |
| aircraft | The Boeing Company | DC-9-82 (MD-82) | Airworthiness Directives; McDONNELL DOUGLAS DC-9-81, -82, -83 and -87 (MD-81, -82, -83, and -87) Series Airplanes, and Model MD-88 Series Airplanes |
| aircraft | The Boeing Company | DC-9-83 (MD-83) | Airworthiness Directives; McDONNELL DOUGLAS DC-9-81, -82, -83 and -87 (MD-81, -82, -83, and -87) Series Airplanes, and Model MD-88 Series Airplanes |
| aircraft | The Boeing Company | DC-9-87 (MD-87) | Airworthiness Directives; McDONNELL DOUGLAS DC-9-81, -82, -83 and -87 (MD-81, -82, -83, and -87) Series Airplanes, and Model MD-88 Series Airplanes |
| aircraft | The Boeing Company | MD-88 | Airworthiness Directives; McDONNELL DOUGLAS DC-9-81, -82, -83 and -87 (MD-81, -82, -83, and -87) Series Airplanes, and Model MD-88 Series Airplanes |
Unsafe Condition
The engine forward mount cone bolts may have incorrect part numbers or indications of shear section cut-out, which could cause the engine to depart the aircraft during a hard landing, sudden engine seizure, or when encountering high velocity vertical gusts during flight.
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Required Actions
Within 30 days after the effective date, perform a one-time visual or ultrasonic inspection of both engine forward mount cone bolts to verify correct part numbers (Barry K2219-9SA3 or McDonnell Douglas 7938004-503). Replace incorrect or defective bolts before further flight. Incorporate a maintenance program revision requiring visual or ultrasonic inspections at each engine change, replacing incorrect bolts before engine installation.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 30 days after the effective date of this AD, unless accomplished since December 21, 1989.
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Affected Aircraft
McDonnell Douglas DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), DC-9-87 (MD-87), and Model MD-88 series airplanes, certificated in any category.
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Federal Register Abstract
Engine Mount Cone Bolts
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_90-25-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 90-25-04 Document Type: AD Final Rules Docket Number: 90-NM-71-AD Subject Heading: Airworthiness Directives; McDONNELL DOUGLAS DC-9-81, -82, -83 and -87 (MD-81, -82, -83, and -87) Ser...Show more Subject: Engine Mount Cone Bolts Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 01/02/1991 Make: The Boeing Company Model: DC-9-81 (MD-81) | DC-9-82 (MD-82) | DC-9-83 (MD-83) | DC-9-87 (MD-87) | MD-88 Product Type: Aircraft Product Subtype: 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: 90-25-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 90-NM-71-AD AMENDMENT: 39-6817 AD NUMBER: 90-25-04 SUBJECT HEADING: Airworthiness Directives; McDONNELL DOUGLAS DC-9-81, -82, -83 and -87 (MD-81, -82, -83, and -87) Series Airplanes, and Model MD-88 Series Airplanes ACTION: SUMMARY: DATES: Effective January 2, 1991. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 90-25-04 McDONNELL DOUGLAS: Amendment 39-6817. Docket No. 90-NM-71-AD. Applicability: Models DC-9-81, -82, -83 and -87 (MD-81, -82, -83, and -87) series airplanes, and Model MD-88 series airplanes, certificated in any category. Compliance: Required as indicated, unless accomplished since December 21, 1989. To prevent the engine from departing the aircraft during a hard landing, in the event of a sudden engine seizure, or during flight when high velocity vertical gust is encountered, accomplish the following: A. Within 30 days after the effective date of this AD, accomplish the following: 1. Perform one of the following inspections: a. Perform a one-time visual inspection of both the left and right engine forward mount cone bolts for the correct part number, in accordance with McDonnell Douglas MD-80 Alert Service Bulletin A71-49, Revision 2, dated November 4, 1990 (from hereon referred to as the Service Bulletin). If the part number of the cone bolt is other than "Barry" Part Number K2219-9SA3 or McDonnell Douglas Part Number 7938004-503, prior to further flight, remove and replace the bolt with a "Barry" Part Number K2219-9SA3 or McDonnell Douglas Part Number 7938004-503 cone bolt; or b. Perform a one-time ultrasonic inspection of both the left and right engine forward mount cone bolts in accordance with the Service Bulletin. If the part shows an indication of shear section cut-out, remove and replace the bolt with a "Barry" Part Number K2219-9SA3 or McDonnell Douglas Part Number 7938004-503 cone bolt. 2. Incorporate a revision into the FAA-approved maintenance inspection program which provides for a visual or ultrasonic inspection of the engine forward mount cone bolts for "Barry" Part Number K2219-9SA3, or McDonnell Douglas Part Number 7938004-503, at each engine change and, if incorrect bolts are found, replace with "Barry" Part Number K2219-9SA3 or McDonnell Douglas Part Number 7938004-503 bolts before each engine installation. B. An alternate means of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Los Angeles Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate. NOTE: The request should be submitted directly to the Manager, Los Angeles ACO, and a copy sent to the cognizant FAA Principal Inspector (PI). The PI will then forward comments or concurrence to the Los Angeles ACO. C. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD. All persons affected by this directive who have not already received the appropriate service documents from the manufacturer may obtain copies upon request to McDonnell Douglas Corporation, 3855 Lakewood Boulevard, Long Beach, California 90846, Attention: Business Unit Manager of Publications, C1-HCW (54-60). These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue S.W., Renton, Washington, or the Los Angeles Aircraft Certification Office, 3229 East Spring Street, Long Beach, California. This amendment (39-6817, AD 90-25-04) becomes effective January 2, 1991. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_90-25-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 90-25-04 Document Type: AD Final Rules Docket Number: 90-NM-71-AD Subject Heading: Airworthiness Directives; McDONNELL DOUGLAS DC-9-81, -82, -83 and -87 (MD-81, -82, -83, and -87) Ser...Show more Subject: Engine Mount Cone Bolts Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 01/02/1991 Make: The Boeing Company Model: DC-9-81 (MD-81) | DC-9-82 (MD-82) | DC-9-83 (MD-83) | DC-9-87 (MD-87) | MD-88 Product Type: Aircraft Product Subtype: 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: 90-25-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 90-NM-71-AD AMENDMENT: 39-6817 AD NUMBER: 90-25-04 SUBJECT HEADING: Airworthiness Directives; McDONNELL DOUGLAS DC-9-81, -82, -83 and -87 (MD-81, -82, -83, and -87) Series Airplanes, and Model MD-88 Series Airplanes ACTION: SUMMARY: DATES: Effective January 2, 1991. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 90-25-04 McDONNELL DOUGLAS: Amendment 39-6817. Docket No. 90-NM-71-AD. Applicability: Models DC-9-81, -82, -83 and -87 (MD-81, -82, -83, and -87) series airplanes, and Model MD-88 series airplanes, certificated in any category. Compliance: Required as indicated, unless accomplished since December 21, 1989. To prevent the engine from departing the aircraft during a hard landing, in the event of a sudden engine seizure, or during flight when high velocity vertical gust is encountered, accomplish the following: A. Within 30 days after the effective date of this AD, accomplish the following: 1. Perform one of the following inspections: a. Perform a one-time visual inspection of both the left and right engine forward mount cone bolts for the correct part number, in accordance with McDonnell Douglas MD-80 Alert Service Bulletin A71-49, Revision 2, dated November 4, 1990 (from hereon referred to as the Service Bulletin). If the part number of the cone bolt is other than "Barry" Part Number K2219-9SA3 or McDonnell Douglas Part Number 7938004-503, prior to further flight, remove and replace the bolt with a "Barry" Part Number K2219-9SA3 or McDonnell Douglas Part Number 7938004-503 cone bolt; or b. Perform a one-time ultrasonic inspection of both the left and right engine forward mount cone bolts in accordance with the Service Bulletin. If the part shows an indication of shear section cut-out, remove and replace the bolt with a "Barry" Part Number K2219-9SA3 or McDonnell Douglas Part Number 7938004-503 cone bolt. 2. Incorporate a revision into the FAA-approved maintenance inspection program which provides for a visual or ultrasonic inspection of the engine forward mount cone bolts for "Barry" Part Number K2219-9SA3, or McDonnell Douglas Part Number 7938004-503, at each engine change and, if incorrect bolts are found, replace with "Barry" Part Number K2219-9SA3 or McDonnell Douglas Part Number 7938004-503 bolts before each engine installation. B. An alternate means of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Los Angeles Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate. NOTE: The request should be submitted directly to the Manager, Los Angeles ACO, and a copy sent to the cognizant FAA Principal Inspector (PI). The PI will then forward comments or concurrence to the Los Angeles ACO. C. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD. All persons affected by this directive who have not already received the appropriate service documents from the manufacturer may obtain copies upon request to McDonnell Douglas Corporation, 3855 Lakewood Boulevard, Long Beach, California 90846, Attention: Business Unit Manager of Publications, C1-HCW (54-60). These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue S.W., Renton, Washington, or the Los Angeles Aircraft Certification Office, 3229 East Spring Street, Long Beach, California. This amendment (39-6817, AD 90-25-04) becomes effective January 2, 1991. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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