AD 78-23-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-9-11 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes, including military version |
| aircraft | The Boeing Company | DC-9-12 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes, including military version |
| aircraft | The Boeing Company | DC-9-13 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes, including military version |
| aircraft | The Boeing Company | DC-9-14 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes, including military version |
| aircraft | The Boeing Company | DC-9-15 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes, including military version |
| aircraft | The Boeing Company | DC-9-15F | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes, including military version |
| aircraft | The Boeing Company | DC-9-21 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes, including military version |
| aircraft | The Boeing Company | DC-9-31 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes, including military version |
| aircraft | The Boeing Company | DC-9-32 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes, including military version |
| aircraft | The Boeing Company | DC-9-32 (VC-9C) | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes, including military version |
| aircraft | The Boeing Company | DC-9-32F | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes, including military version |
| aircraft | The Boeing Company | DC-9-32F (C-9A) | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes, including military version |
| aircraft | The Boeing Company | DC-9-32F (C-9B) | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes, including military version |
| aircraft | The Boeing Company | DC-9-33F | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes, including military version |
| aircraft | The Boeing Company | DC-9-34 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes, including military version |
| aircraft | The Boeing Company | DC-9-34F | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes, including military version |
| aircraft | The Boeing Company | DC-9-41 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes, including military version |
| aircraft | The Boeing Company | DC-9-51 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes, including military version |
Unsafe Condition
A false stall warning just after initiation of rotation could cause an unnecessary rejected takeoff.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Modify the stall warning circuitry in accordance with McDonnell Douglas Service Bulletin 34-131 dated January 10, 1978. Equivalent modifications may be used if approved by the Chief, Aircraft Engineering Division, FAA Western Region.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within one year after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
McDonnell Douglas DC-9-10, -20, -30, -40, -50 series airplanes, including military versions, all serial numbers
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Stall Warning System
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_78-23-06.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 78-23-06 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes, including ...Show more Subject: Stall Warning System Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 12/11/1978 Make: The Boeing Company Model: DC-9-11 | DC-9-12 | DC-9-13 | DC-9-14 | DC-9-15 | DC-9-15F | DC-9-21 | DC-9-31 | DC-9-32 | DC-9-32 (...Show more 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: 78-23-06 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-3343 AD NUMBER: 78-23-06 SUBJECT HEADING: Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes, including military version ACTION: SUMMARY: DATES: Effective December 11, 1978. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 78-23-06 MCDONNELL DOUGLAS: Amendment 39-3343. Applies to McDonnell Douglas DC-9-10, -20, -30, -40, -50 series airplanes, including the military versions, all serial numbers, certificated in all categories. Compliance is required within one year after the effective date of this AD. To reduce the probability of an unnecessary rejected takeoff due to a false stall warning just after initiation of rotation, modify the stall warning system by extending the time delay to four seconds between nose gear lift-off and the initiation of stall warning, by accomplishing the following: (a) Modify the stall warning circuitry in accordance with McDonnell Douglas DC-9 Service Bulletin 34-131 dated January 10, 1978. NOTE: Service Bulletin 34-131 dated January 10, 1978, is the only version of this service bulletin suitable for compliance with paragraph (a) of this AD. (b) Equivalent modifications, procedures, or revisions may be used when approved by the Chief, Aircraft Engineering Division, FAA Western Region. (c) Special flight permits may be issued in accordance with FAR's 21.197 and 21.199 to operate airplanes to a base for accomplishment of the modification required by this AD. This amendment becomes effective December 11, 1978. FOOTER:
Document Text
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AD Final Rules - DRS_78-23-06.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 78-23-06 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes, including ...Show more Subject: Stall Warning System Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 12/11/1978 Make: The Boeing Company Model: DC-9-11 | DC-9-12 | DC-9-13 | DC-9-14 | DC-9-15 | DC-9-15F | DC-9-21 | DC-9-31 | DC-9-32 | DC-9-32 (...Show more 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: 78-23-06 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-3343 AD NUMBER: 78-23-06 SUBJECT HEADING: Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10, -20, -30, -40, -50 Series Airplanes, including military version ACTION: SUMMARY: DATES: Effective December 11, 1978. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 78-23-06 MCDONNELL DOUGLAS: Amendment 39-3343. Applies to McDonnell Douglas DC-9-10, -20, -30, -40, -50 series airplanes, including the military versions, all serial numbers, certificated in all categories. Compliance is required within one year after the effective date of this AD. To reduce the probability of an unnecessary rejected takeoff due to a false stall warning just after initiation of rotation, modify the stall warning system by extending the time delay to four seconds between nose gear lift-off and the initiation of stall warning, by accomplishing the following: (a) Modify the stall warning circuitry in accordance with McDonnell Douglas DC-9 Service Bulletin 34-131 dated January 10, 1978. NOTE: Service Bulletin 34-131 dated January 10, 1978, is the only version of this service bulletin suitable for compliance with paragraph (a) of this AD. (b) Equivalent modifications, procedures, or revisions may be used when approved by the Chief, Aircraft Engineering Division, FAA Western Region. (c) Special flight permits may be issued in accordance with FAR's 21.197 and 21.199 to operate airplanes to a base for accomplishment of the modification required by this AD. This amendment becomes effective December 11, 1978. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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