AD 77-08-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | General Electric Company | CF6-50A | GENERAL ELECTRIC Models CF6-50A, CF6-50C, CF6-50C1, CF6-50D, CF6-50E, CF6-50E1, and CF6-50H Engines |
| engine | General Electric Company | CF6-50C | GENERAL ELECTRIC Models CF6-50A, CF6-50C, CF6-50C1, CF6-50D, CF6-50E, CF6-50E1, and CF6-50H Engines |
| engine | General Electric Company | CF6-50C1 | GENERAL ELECTRIC Models CF6-50A, CF6-50C, CF6-50C1, CF6-50D, CF6-50E, CF6-50E1, and CF6-50H Engines |
| engine | General Electric Company | CF6-50E | GENERAL ELECTRIC Models CF6-50A, CF6-50C, CF6-50C1, CF6-50D, CF6-50E, CF6-50E1, and CF6-50H Engines |
| engine | General Electric Company | CF6-50E1 | GENERAL ELECTRIC Models CF6-50A, CF6-50C, CF6-50C1, CF6-50D, CF6-50E, CF6-50E1, and CF6-50H Engines |
Unsafe Condition
Burn through of fuel or oil tubes located below the compressor section.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace specific fuel manifold, lube supply, and sump scavenge parts with revised part numbers as per General Electric Service Bulletin 72-447 or FAA-approved revisions.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
January 31, 1978, unless previously accomplished
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
General Electric Models CF6-50A, CF6-50C, CF6-50C1, CF6-50D, CF6-50E, CF6-50E1, and CF6-50H engines with serial numbers excluding those with steel high pressure compressor rotors/cases (specifically excluding serial numbers 517451, 517452, 517472-517475, 517502, subsequent 517 prefixed numbers, and 455907-455912, 455920, subsequent 455 prefixed numbers).
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Compressor
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_77-08-08.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 77-08-08 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: GENERAL ELECTRIC Models CF6-50A, CF6-50C, CF6-50C1, CF6-50D, CF6-50E, CF6-50E1, and CF6-50H Engines Subject: Compressor Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 02/14/1980 Make: General Electric Company Model: CF6-50A | CF6-50C | CF6-50C1 | CF6-50E | CF6-50E1 Product Type: Engine Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 77-08-08 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-3690 AD NUMBER: 77-08-08 SUBJECT HEADING: GENERAL ELECTRIC Models CF6-50A, CF6-50C, CF6-50C1, CF6-50D, CF6-50E, CF6-50E1, and CF6-50H Engines ACTION: SUMMARY: DATES: Effective February 14, 1980. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 77-08-08 GENERAL ELECTRIC: Amendment 39-2878 as amended by Amendment 39-3690. Applies to General Electric Models CF6-50A, CF6-50C, CF6-50C1, CF6-50D, CF6-50E, CF6-50E1, and CF6-50H engines that do not incorporate steel high pressure compressor rotors and cases, and are installed in aircraft certificated in all categories. Engines with serial numbers 517451, 517452, 517472 thru 517475, 517502, and subsequent 517 prefixed numbers; and 455907 thru 455912, 455920, and subsequent 455 prefixed numbers were manufactured with steel compressor rotors and cases. Earlier engines may be converted to the steel configuration in accordance with General Electric Service Bulletins (CF6-50/45) 72-547, 72-549, 72-550, and 72-551. Compliance required by January 31, 1978, unless previously accomplished. To prevent possible burn through of fuel or oil tubes located below the compressor section, accomplish the following in accordance with General Electric Service Bulletin (CF6-50) 72-447 dated December 30, 1976, or subsequent FAA Approved revisions thereto: (a) Replace the Fuel Manifold, Part Number 9008M43G01, 9008M43G02 or 9008M43G03, with Part Number 9200M17G01, 9200M17G02 or 9200M17G03. (b) Replace the Lube Supply, Part Number 9043M25G02, with Part Number 9200M11G01. (c) Replace the "B" Sump Scavenge Aft, Part Number 9068M88G01 or 9194M18G01, with Part Number 9200M10G01. (d) Replace the "B" Sump Scavenge Forward, Part Number 9005M64G01, with Part Number 9191M72G01. (e) Replace the "C" Sump Scavenge, Part Number 9054M44G01, with Part Number 9200M15G03. (f) Replace the "D" Sump Scavenge, Part Number 9055M93G01, with Part Number 9200M16G02. Equivalent modifications may be approved by the Chief, Engineering and Manufacturing Branch, FAA Great Lakes Region. Amendment 39-2878 became effective April 29, 1977. This Amendment 39-3690 becomes effective February 14, 1980. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_77-08-08.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 77-08-08 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: GENERAL ELECTRIC Models CF6-50A, CF6-50C, CF6-50C1, CF6-50D, CF6-50E, CF6-50E1, and CF6-50H Engines Subject: Compressor Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 02/14/1980 Make: General Electric Company Model: CF6-50A | CF6-50C | CF6-50C1 | CF6-50E | CF6-50E1 Product Type: Engine Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 77-08-08 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-3690 AD NUMBER: 77-08-08 SUBJECT HEADING: GENERAL ELECTRIC Models CF6-50A, CF6-50C, CF6-50C1, CF6-50D, CF6-50E, CF6-50E1, and CF6-50H Engines ACTION: SUMMARY: DATES: Effective February 14, 1980. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 77-08-08 GENERAL ELECTRIC: Amendment 39-2878 as amended by Amendment 39-3690. Applies to General Electric Models CF6-50A, CF6-50C, CF6-50C1, CF6-50D, CF6-50E, CF6-50E1, and CF6-50H engines that do not incorporate steel high pressure compressor rotors and cases, and are installed in aircraft certificated in all categories. Engines with serial numbers 517451, 517452, 517472 thru 517475, 517502, and subsequent 517 prefixed numbers; and 455907 thru 455912, 455920, and subsequent 455 prefixed numbers were manufactured with steel compressor rotors and cases. Earlier engines may be converted to the steel configuration in accordance with General Electric Service Bulletins (CF6-50/45) 72-547, 72-549, 72-550, and 72-551. Compliance required by January 31, 1978, unless previously accomplished. To prevent possible burn through of fuel or oil tubes located below the compressor section, accomplish the following in accordance with General Electric Service Bulletin (CF6-50) 72-447 dated December 30, 1976, or subsequent FAA Approved revisions thereto: (a) Replace the Fuel Manifold, Part Number 9008M43G01, 9008M43G02 or 9008M43G03, with Part Number 9200M17G01, 9200M17G02 or 9200M17G03. (b) Replace the Lube Supply, Part Number 9043M25G02, with Part Number 9200M11G01. (c) Replace the "B" Sump Scavenge Aft, Part Number 9068M88G01 or 9194M18G01, with Part Number 9200M10G01. (d) Replace the "B" Sump Scavenge Forward, Part Number 9005M64G01, with Part Number 9191M72G01. (e) Replace the "C" Sump Scavenge, Part Number 9054M44G01, with Part Number 9200M15G03. (f) Replace the "D" Sump Scavenge, Part Number 9055M93G01, with Part Number 9200M16G02. Equivalent modifications may be approved by the Chief, Engineering and Manufacturing Branch, FAA Great Lakes Region. Amendment 39-2878 became effective April 29, 1977. This Amendment 39-3690 becomes effective February 14, 1980. 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
2023-04-11
final ruleAirworthiness Directives; General Electric Company Turbofan Engines
Unsafe Condition: Separation of the low-pressure turbine (LPT) rotor assembly, resulting in the LPT rotor assembly departing the rear of the engine.
2011-23-04 Recurring
final ruleAirworthiness Directives; General Electric Company (GE) CF6 Turbofan Engines
Unsafe Condition: Failure of the side links and possible engine separation from the airplane.
2011-07-01
final ruleAirworthiness Directives; General Electric Company CF6-45 and CF6-50 Series Turbofan Engines
Unsafe Condition: The forward and aft centerbody of the LFCEN assembly may separate from the engine, causing damage to the engine, and damage to the airplane.
2008-02-17 Recurring
final ruleAirworthiness Directives; General Electric Company CF6-50, -80A1/A3, and -80C2A Series Turbofan Engines
Unsafe Condition: Inadvertent in-flight thrust reverser deployment, which can result in loss of control of the airplane.