AD 78-01-08
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 727-100 Series | BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727-100C Series | BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727-200 Series | BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727-200F Series | BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727 Series | BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727C Series | BOEING Model 727 Series Airplanes |
Unsafe Condition
Failure of the automatic throttles due to improper actuation of thrust lever operated switches S197, S784, S553, and S555 below -65 degrees F could result in loss of thrust control.
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Required Actions
Set thrust lever operated switches S197, S784, S553, and S555 to provide actuation down to and including -65 degrees F per Boeing Service Bulletin 727-31-30 or equivalent. Submit proposed modifications for non-Boeing automatic throttles to the FAA Northwest Region.
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Compliance Time
Within 2000 hours time in service after the effective date of this AD
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Affected Aircraft
Boeing Model 727 series airplanes with autospeed brake system or auto wheel brakes with JT8D-17R engines and automatic throttle clutches, except those with EPR activated takeoff warning system.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Automatic Throttles
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_78-01-08.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 78-01-08 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: BOEING Model 727 Series Airplanes Subject: Automatic Throttles Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 01/16/1978 Make: The Boeing Company Model: 727-100 Series | 727-100C Series | 727-200 Series | 727-200F Series | 727 Series | 727C Series Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 78-01-08 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-3113 AD NUMBER: 78-01-08 SUBJECT HEADING: BOEING Model 727 Series Airplanes ACTION: SUMMARY: DATES: Effective January 16, 1978. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 78-01-08 BOEING: Amendment 39-3113. Applies to all Model 727 series airplanes certificated in all categories with autospeed brake system installed and airplanes with auto wheel brakes in conjunction with JT8D-17R engines and Boeing automatic throttle clutches, except airplanes with Engine Pressure Ratio (EPR) activated takeoff warning system. Compliance required as indicated. Within 2000 hours time in service after the effective date of this AD, unless already accomplished, set the thrust lever operated switches S197, S784, S553, and S555 to provide actuation down to and including -65 degrees F per applicable part of Boeing Service Bulletin 727-31-30, or later FAA approved revisions, or equivalent approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region. For airplanes which have automatic throttles not designed by Boeing, the modification kits available from Boeing may not be applicable. Operators of those airplanes must submit their proposed modifications to the Chief, Engineering and Manufacturing Branch, FAA Northwest Region, 9010 East Marginal Way South, Seattle, Washington 98108. This amendment becomes effective January 16, 1978. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_78-01-08.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 78-01-08 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: BOEING Model 727 Series Airplanes Subject: Automatic Throttles Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 01/16/1978 Make: The Boeing Company Model: 727-100 Series | 727-100C Series | 727-200 Series | 727-200F Series | 727 Series | 727C Series 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: 78-01-08 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-3113 AD NUMBER: 78-01-08 SUBJECT HEADING: BOEING Model 727 Series Airplanes ACTION: SUMMARY: DATES: Effective January 16, 1978. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 78-01-08 BOEING: Amendment 39-3113. Applies to all Model 727 series airplanes certificated in all categories with autospeed brake system installed and airplanes with auto wheel brakes in conjunction with JT8D-17R engines and Boeing automatic throttle clutches, except airplanes with Engine Pressure Ratio (EPR) activated takeoff warning system. Compliance required as indicated. Within 2000 hours time in service after the effective date of this AD, unless already accomplished, set the thrust lever operated switches S197, S784, S553, and S555 to provide actuation down to and including -65 degrees F per applicable part of Boeing Service Bulletin 727-31-30, or later FAA approved revisions, or equivalent approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region. For airplanes which have automatic throttles not designed by Boeing, the modification kits available from Boeing may not be applicable. Operators of those airplanes must submit their proposed modifications to the Chief, Engineering and Manufacturing Branch, FAA Northwest Region, 9010 East Marginal Way South, Seattle, Washington 98108. This amendment becomes effective January 16, 1978. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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