AD 77-07-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT8D-9 | PRATT & WHITNEY AIRCRAFT Models JT8D-9 and -9A Engines |
| engine | Pratt & Whitney Division | JT8D-9A | PRATT & WHITNEY AIRCRAFT Models JT8D-9 and -9A Engines |
Unsafe Condition
Interference between the fourth stage turbine stator and rotor due to possible intermixing of different material stators.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect for and replace all fourth stage stator vanes not FAA approved for that engine model.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
prior to the accumulation of 6000 hours time in service after February 20, 1975
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney Aircraft JT8D-9 and -9A engines with specified serial numbers listed in the AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Fourth Stage Turbine Stator And Rotor
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_77-07-11.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 77-07-11 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: PRATT & WHITNEY AIRCRAFT Models JT8D-9 and -9A Engines Subject: Fourth Stage Turbine Stator And Rotor Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 04/15/1977 Make: Pratt & Whitney Division Model: JT8D-9 | JT8D-9A Product Type: Engine Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 77-07-11 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2872 AD NUMBER: 77-07-11 SUBJECT HEADING: PRATT & WHITNEY AIRCRAFT Models JT8D-9 and -9A Engines ACTION: SUMMARY: DATES: Effective April 15, 1977. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 77-07-11 PRATT & WHITNEY AIRCRAFT: Amendment 39-2872. Applies to Pratt & Whitney Aircraft JT8D-9 and -9A turbofan engine models with the following serial numbers: 665158, 665161, 665165, 665169, 665179, 665180, 665181, 665194, 665197, 665201, 665202, 665207, 665208, 665213, 665215, 665216, 665218, 665220, 665221, 665231, 665244, 665246, 665252, 665254, 665258, 665279, 665282, 665283, 665285, 665288, 665303, 665304, 665311, 665312, 665315, 665317, 665318, 665321, 665323, 665328, 665329, 665331, 665335, 665336, 665338, 665340, 665345, 665358, 665364, 665370, 665375, 665377, 665380, 665381, 665384, 665386, 665388, 665389, 665392, 665393, 665402, 665406, 665408, 665410, 665416, 665417, 665418, 665421, 665429, 665434, 665436, 665437, 665438, 665440, 665441, 665442, 665443, 665448, 665455, 665459, 665463, 665467, 665468, 665481, 665489, 665519, 665520, 665521, 665528, 665529, 665531, 665532, 665533, 665536, 665538, 665547, 665548, 665549, 665551, 665552, 665560, 665562, 665563, 665630, 665631, 665636, 665637, 665659, 665661, 665662, 665663, 665664, 665665, 665666, 665667, 665668, 665681, 665682, 665683, 666789, 666803, 666807, 666810, 666838, 666882, 666884, 666892, 666901, 666913, 674162, 674344, 674399, 674401, 674250, 674262, 674266, 674314, 674325, 674333, 674335, 674354, 674355, 674359, 674361, 674374, 674376, 674379, 674380, 674384, 674391, 674400, 674404, 674422, 674482, 674487, 674489 Compliance required as indicated prior to the accumulation of 6000 hours time in service after February 20, 1975, unless already accomplished. To preclude interference between the fourth stage turbine stator and rotor as a result of possible intermixing of different material stators, inspect for and replace all fourth stage stator vanes not FAA approved for that engine model. This supersedes Amendment 39-1835, AD 74-10-12, as amended by Amendment 39-2088. This Amendment becomes effective April 15, 1977. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_77-07-11.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 77-07-11 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: PRATT & WHITNEY AIRCRAFT Models JT8D-9 and -9A Engines Subject: Fourth Stage Turbine Stator And Rotor Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 04/15/1977 Make: Pratt & Whitney Division Model: JT8D-9 | JT8D-9A 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: 77-07-11 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2872 AD NUMBER: 77-07-11 SUBJECT HEADING: PRATT & WHITNEY AIRCRAFT Models JT8D-9 and -9A Engines ACTION: SUMMARY: DATES: Effective April 15, 1977. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 77-07-11 PRATT & WHITNEY AIRCRAFT: Amendment 39-2872. Applies to Pratt & Whitney Aircraft JT8D-9 and -9A turbofan engine models with the following serial numbers: 665158, 665161, 665165, 665169, 665179, 665180, 665181, 665194, 665197, 665201, 665202, 665207, 665208, 665213, 665215, 665216, 665218, 665220, 665221, 665231, 665244, 665246, 665252, 665254, 665258, 665279, 665282, 665283, 665285, 665288, 665303, 665304, 665311, 665312, 665315, 665317, 665318, 665321, 665323, 665328, 665329, 665331, 665335, 665336, 665338, 665340, 665345, 665358, 665364, 665370, 665375, 665377, 665380, 665381, 665384, 665386, 665388, 665389, 665392, 665393, 665402, 665406, 665408, 665410, 665416, 665417, 665418, 665421, 665429, 665434, 665436, 665437, 665438, 665440, 665441, 665442, 665443, 665448, 665455, 665459, 665463, 665467, 665468, 665481, 665489, 665519, 665520, 665521, 665528, 665529, 665531, 665532, 665533, 665536, 665538, 665547, 665548, 665549, 665551, 665552, 665560, 665562, 665563, 665630, 665631, 665636, 665637, 665659, 665661, 665662, 665663, 665664, 665665, 665666, 665667, 665668, 665681, 665682, 665683, 666789, 666803, 666807, 666810, 666838, 666882, 666884, 666892, 666901, 666913, 674162, 674344, 674399, 674401, 674250, 674262, 674266, 674314, 674325, 674333, 674335, 674354, 674355, 674359, 674361, 674374, 674376, 674379, 674380, 674384, 674391, 674400, 674404, 674422, 674482, 674487, 674489 Compliance required as indicated prior to the accumulation of 6000 hours time in service after February 20, 1975, unless already accomplished. To preclude interference between the fourth stage turbine stator and rotor as a result of possible intermixing of different material stators, inspect for and replace all fourth stage stator vanes not FAA approved for that engine model. This supersedes Amendment 39-1835, AD 74-10-12, as amended by Amendment 39-2088. This Amendment becomes effective April 15, 1977. 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
2011-03-01
final ruleAirworthiness Directives; Pratt & Whitney JT8D-7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, and -17AR Series Turbofan Engines
Unsafe Condition: Critical life-limited rotating engine part failure, which could result in an uncontained engine failure and damage to the airplane.
2010-21-17
final ruleAirworthiness Directives; Pratt & Whitney JT8D-9, -9A, -11, -15, -17, and -17R Turbofan Engines
Unsafe Condition: High-cycle fatigue cracking at the blade root, which could result in uncontained failures of first stage fan blades and damage to the airplane.
2009-24-01 Recurring
final ruleAirworthiness Directives; Pratt & Whitney JT8D-7, -7A, -7B, -9, -9A, -11, -15, and -17 Turbofan Engines
Unsafe Condition: could result in damage to the airplane.
2006-17-07R1
final ruleAirworthiness Directives; Pratt & Whitney JT8D-1, -1A, -1B, -7, - 7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, -17AR, -209, -217, - 217A, -217C, and -219 Turbofan Engines
Unsafe Condition: Cracking of high pressure compressor (HPC) front hubs and HPC disks coated with PWA 110-21 coating could result in uncontained engine failure and damage to the airplane.