AD 71-17-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | J60-P-5B | PRATT & WHITNEY AIRCRAFT Model JT12A-6, JT12A-6A, JT12A-8, and J60P-5B Engines |
| engine | Pratt & Whitney Division | JT12A-6 | PRATT & WHITNEY AIRCRAFT Model JT12A-6, JT12A-6A, JT12A-8, and J60P-5B Engines |
| engine | Pratt & Whitney Division | JT12A-6A | PRATT & WHITNEY AIRCRAFT Model JT12A-6, JT12A-6A, JT12A-8, and J60P-5B Engines |
| engine | Pratt & Whitney Division | JT12A-8 | PRATT & WHITNEY AIRCRAFT Model JT12A-6, JT12A-6A, JT12A-8, and J60P-5B Engines |
Unsafe Condition
Cracking and possible failure of stage 2, 3, 7, and 8 compressor rotor discs due to life limits exceeding revised lower thresholds.
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Required Actions
Remove from service stage 2, 3, 7, and 8 compressor rotor discs prior to reaching the revised life limits (specifically reduced from previous limits for part numbers 406302, 541902, 406203, 541903, 426107, 541907, 406208, 541908). Compliance must occur within 30 cycles in service after the effective date or before reaching the new life limits, whichever is later.
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Compliance Time
within 30 cycles in service after the effective date of this airworthiness directive, whichever comes later
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Affected Aircraft
Pratt & Whitney Aircraft JT12A-6, JT12A-6A, JT12A-8, and J60P-5B Turbojet engines
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Federal Register Abstract
Stage 2, 3, 7 and 8 Compressor Rotor Discs
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_71-17-06.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 71-17-06 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: PRATT & WHITNEY AIRCRAFT Model JT12A-6, JT12A-6A, JT12A-8, and J60P-5B Engines Subject: Stage 2, 3, 7 and 8 Compressor Rotor Discs Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 08/17/1971 Make: Pratt & Whitney Division Model: J60-P-5B | JT12A-6 | JT12A-6A | JT12A-8 Product Type: Engine Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 71-17-06 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1262 AD NUMBER: 71-17-06 SUBJECT HEADING: PRATT & WHITNEY AIRCRAFT Model JT12A-6, JT12A-6A, JT12A-8, and J60P-5B Engines ACTION: SUMMARY: DATES: Effective August 17, 1971. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 71-17-06 PRATT & WHITNEY AIRCRAFT: Amendment 39-1262. Applies to all Pratt & Whitney Aircraft JT12A-6, JT12A-6A, JT12A-8, and J60P-5B Turbojet engines. Compliance required as indicated. To prevent cracking and possible failure of stage 2, 3, 7 and 8 compressor rotor discs of life limits on these parts have been reduced below the figures currently approved. Unless already accomplished, remove from service stage 2, 3, 7 and 8 compressor rotor discs prior to reaching the revised life limit below or, within the next 30 cycles in service after the effective date of this airworthiness directive, whichever comes later. Part Number Previous Life Limit Cycles Revised Life Limit Cycles 406302 8000 6000 541902 8000 6000 406203 7500 4000 541903 7500 4000 426107 4000 2500 541907 4000 2500 406208 8000 5000 541908 8000 5000 NOTE: (The disc hour life limit as specified in Pratt & Whitney Aircraft Overhaul Manual Part No. 435108 Table of Limits Section XI has not been revised.) (Upon submission of substantiating data by an owner or operator through an FAA Maintenance Inspector, the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region, may adjust the compliance time.) NOTE: P&WA Telegram PSE/AMG/1-7-13-1 covers this same subject. This amendment is effective August 17, 1971. FOOTER:
Document Text
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AD Final Rules - DRS_71-17-06.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 71-17-06 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: PRATT & WHITNEY AIRCRAFT Model JT12A-6, JT12A-6A, JT12A-8, and J60P-5B Engines Subject: Stage 2, 3, 7 and 8 Compressor Rotor Discs Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 08/17/1971 Make: Pratt & Whitney Division Model: J60-P-5B | JT12A-6 | JT12A-6A | JT12A-8 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: 71-17-06 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1262 AD NUMBER: 71-17-06 SUBJECT HEADING: PRATT & WHITNEY AIRCRAFT Model JT12A-6, JT12A-6A, JT12A-8, and J60P-5B Engines ACTION: SUMMARY: DATES: Effective August 17, 1971. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 71-17-06 PRATT & WHITNEY AIRCRAFT: Amendment 39-1262. Applies to all Pratt & Whitney Aircraft JT12A-6, JT12A-6A, JT12A-8, and J60P-5B Turbojet engines. Compliance required as indicated. To prevent cracking and possible failure of stage 2, 3, 7 and 8 compressor rotor discs of life limits on these parts have been reduced below the figures currently approved. Unless already accomplished, remove from service stage 2, 3, 7 and 8 compressor rotor discs prior to reaching the revised life limit below or, within the next 30 cycles in service after the effective date of this airworthiness directive, whichever comes later. Part Number Previous Life Limit Cycles Revised Life Limit Cycles 406302 8000 6000 541902 8000 6000 406203 7500 4000 541903 7500 4000 426107 4000 2500 541907 4000 2500 406208 8000 5000 541908 8000 5000 NOTE: (The disc hour life limit as specified in Pratt & Whitney Aircraft Overhaul Manual Part No. 435108 Table of Limits Section XI has not been revised.) (Upon submission of substantiating data by an owner or operator through an FAA Maintenance Inspector, the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region, may adjust the compliance time.) NOTE: P&WA Telegram PSE/AMG/1-7-13-1 covers this same subject. This amendment is effective August 17, 1971. FOOTER:
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Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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