AD 90-04-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-9-81 (MD-81) | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-80 and MD-88 Series Airplanes |
| aircraft | The Boeing Company | DC-9-82 (MD-82) | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-80 and MD-88 Series Airplanes |
| aircraft | The Boeing Company | DC-9-83 (MD-83) | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-80 and MD-88 Series Airplanes |
| aircraft | The Boeing Company | DC-9-87 (MD-87) | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-80 and MD-88 Series Airplanes |
| aircraft | The Boeing Company | MD-88 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-80 and MD-88 Series Airplanes |
Unsafe Condition
Deactivation of the takeoff warning system by the flight crew to eliminate nuisance warnings during single-engine taxi operation, leading to potential takeoff in an unsafe configuration.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Rewire the takeoff warning system throttle lever switches to place them in series instead of parallel, as approved by the FAA or per McDonnell Douglas Service Bulletin 31-34. An alternate means of compliance or adjustment may be approved by the FAA.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 12 months after the effective date of this AD
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Affected Aircraft
MCDONNELL DOUGLAS DC-9-80 and MD-88 series airplanes, certificated in any category.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Takeoff Warning System
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_90-04-05.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 90-04-05 Document Type: AD Final Rules Docket Number: 89-NM-143-AD Subject Heading: Airworthiness Directives; MCDONNELL DOUGLAS DC-9-80 and MD-88 Series Airplanes Subject: Takeoff Warning System Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 03/08/1990 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(MD-82) | DC-9-83 (MD-83) | DC-9-87 (MD-87) | MD-88 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 90-04-05 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 89-NM-143-AD AMENDMENT: 39-6504 AD NUMBER: 90-04-05 SUBJECT HEADING: Airworthiness Directives; MCDONNELL DOUGLAS DC-9-80 and MD-88 Series Airplanes ACTION: SUMMARY: DATES: Effective March 8, 1990. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 90-04-05 MCDONNELL DOUGLAS: Amendment 39-6504. Docket No. 89-NM-143-AD. Applicability: Model DC-9-80 and MD-88 series airplanes, certificated in any category. Compliance: Required as indicated, unless previously accomplished. To prevent takeoff of an airplane while in an unsafe configuration for takeoff, due to deactivation of the takeoff warning system by the flight crew to eliminate nuisance warnings of the takeoff warning system during single-engine taxi operation, accomplish the following: A. Within 12 months after the effective date of this AD, rewire the takeoff warning system throttle lever switches to place them in series, rather than in parallel, in a manner approved by the Manager, Los Angeles Aircraft Certification Office, FAA, Northwest Mountain Region, or in accordance with the Accomplishment Instructions of McDonnell Douglas Service Bulletin 31-34, dated December 20, 1989. 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, FAA, Northwest Mountain Region. NOTE: This request should be forwarded through an FAA Principal Maintenance Inspector (PMI), who will either concur or comment and then send it to the Manager, Los Angeles Aircraft Certification Office, FAA, Northwest Mountain Region. 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: Director of Publications, C1-L00 (54-60). These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 17900 Pacific Highway South, Seattle, Washington, or Los Angeles Aircraft Certification Office, 3229 East Spring Street, Long Beach, California 90806. This amendment (39-6504, AD 90-04-05) becomes effective on March 8, 1990. FOOTER:
Document Text
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AD Final Rules - DRS_90-04-05.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 90-04-05 Document Type: AD Final Rules Docket Number: 89-NM-143-AD Subject Heading: Airworthiness Directives; MCDONNELL DOUGLAS DC-9-80 and MD-88 Series Airplanes Subject: Takeoff Warning System Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 03/08/1990 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: 90-04-05 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 89-NM-143-AD AMENDMENT: 39-6504 AD NUMBER: 90-04-05 SUBJECT HEADING: Airworthiness Directives; MCDONNELL DOUGLAS DC-9-80 and MD-88 Series Airplanes ACTION: SUMMARY: DATES: Effective March 8, 1990. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 90-04-05 MCDONNELL DOUGLAS: Amendment 39-6504. Docket No. 89-NM-143-AD. Applicability: Model DC-9-80 and MD-88 series airplanes, certificated in any category. Compliance: Required as indicated, unless previously accomplished. To prevent takeoff of an airplane while in an unsafe configuration for takeoff, due to deactivation of the takeoff warning system by the flight crew to eliminate nuisance warnings of the takeoff warning system during single-engine taxi operation, accomplish the following: A. Within 12 months after the effective date of this AD, rewire the takeoff warning system throttle lever switches to place them in series, rather than in parallel, in a manner approved by the Manager, Los Angeles Aircraft Certification Office, FAA, Northwest Mountain Region, or in accordance with the Accomplishment Instructions of McDonnell Douglas Service Bulletin 31-34, dated December 20, 1989. 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, FAA, Northwest Mountain Region. NOTE: This request should be forwarded through an FAA Principal Maintenance Inspector (PMI), who will either concur or comment and then send it to the Manager, Los Angeles Aircraft Certification Office, FAA, Northwest Mountain Region. 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: Director of Publications, C1-L00 (54-60). These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 17900 Pacific Highway South, Seattle, Washington, or Los Angeles Aircraft Certification Office, 3229 East Spring Street, Long Beach, California 90806. This amendment (39-6504, AD 90-04-05) becomes effective on March 8, 1990. FOOTER:
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Retrieved: Apr 8, 2026
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