AD 68-17-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce Deutschland Ltd & Co KG | Spey 506-14 | ROLLS-ROYCE Models 506-14, 510-14, 511-8, and 511-14 Engines |
| engine | Rolls-Royce Deutschland Ltd & Co KG | Spey 511-14 | ROLLS-ROYCE Models 506-14, 510-14, 511-8, and 511-14 Engines |
| engine | Rolls-Royce Deutschland Ltd & Co KG | Spey 511-8 | ROLLS-ROYCE Models 506-14, 510-14, 511-8, and 511-14 Engines |
Unsafe Condition
Possible failure of the high pressure (H.P.) center section air duct adjacent to welds, which may cause secondary powerplant damage.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 300 hours time in service after the AD's effective date, visually inspect the high pressure air system center section duct (P/Ns EU.29670A and EU.63415A) for cracks near welds and install a stainless steel wire braid wrap per Rolls-Royce Service Bulletin SP. 75-86 or equivalent. Subsequent inspections at intervals not exceeding 1,000 hours' time in service must check for duct cracks and wire braid security, distortion, or discoloration. Replace defective ducts and wire wraps before further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 300 hours time in service after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Rolls-Royce Spey 506-14, 510-14, 511-8, and 511-14 engines
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Air System Center Section Duct
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_68-17-05.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 68-17-05 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: ROLLS-ROYCE Models 506-14, 510-14, 511-8, and 511-14 Engines Subject: Air System Center Section Duct Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 06/28/1972 Make: Rolls-Royce Deutschland Ltd & Co KG Model: Spey 506-14 | Spey 511-14 | Spey 511-8 Product Type: Engine Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 68-17-05 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1474 AD NUMBER: 68-17-05 SUBJECT HEADING: ROLLS-ROYCE Models 506-14, 510-14, 511-8, and 511-14 Engines ACTION: SUMMARY: DATES: Effective June 28, 1972. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 68-17-05 ROLLS-ROYCE: Amdt. 39-636 as amended by Amendment 39-1318 is further amended by Amendment 39-1474. Applies to Spey Engines Models 506-14, 510-14, 511-8, and 511-14. Compliance required as indicated, unless already accomplished. To prevent or contain a possible failure of the H.P. center section air duct and thereby prevent possible secondary powerplant damage, accomplish the following: (a) Within the next 300 hours time in service after the effective date of this AD, visually inspect (with the aid of a mirror as necessary) the high pressure air system center section duct, P/Ns EU.29670A and EU.63415A, particularly adjacent to welds, for cracks (discoloration of the cowling and engine adjacent to the duct may be indicative of a duct crack), and incorporate a stainless steel wire braid wrap around the high pressure air system center section duct, P/Ns EU.29670A and EU.63415A, in accordance with Rolls-Royce Service Bulletin No. SP. 75-86, dated November 20, 1967, or later ARB-approved or an equivalent approved by the Chief, Aircraft Certification Staff, FAA, Europe, Africa and Middle East Region. (b) At the next scheduled aircraft inspection when the engine is uncowled after compliance with paragraph (a), and thereafter at intervals not to exceed 1,000 hours' time in service from the last inspection, inspect (with the aid of a mirror as necessary) the exposed high pressure air system center section duct for signs of cracking and the stainless steel wire braid wrap for security, distortion, and discoloration. NOTE: Distortion or discoloration of the wire wrap may be indicative of a duct crack. (c) If defects are found during the inspections required by paragraphs (a) and (b), before further flight, replace, as required, the center section duct with a serviceable P/N EU.29670A or P/N EU.63415A duct and a new stainless steel wire braid wrap. (d) Upon the request of an operator, an FAA maintenance inspector, subject to prior approval of the Chief, Aircraft Certification Staff, FAA, Europe, Africa and Middle East Region, may adjust the repetitive inspection interval specified in this AD to permit compliance at an established inspection period of the operator, if the request contains substantiating data to justify the increase for such operator. Amendment 39-636 became effective September 14, 1968. Amendment 39-1318 became effective October 12, 1971. This Amendment 39-1474 becomes effective 28 June 1972. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_68-17-05.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 68-17-05 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: ROLLS-ROYCE Models 506-14, 510-14, 511-8, and 511-14 Engines Subject: Air System Center Section Duct Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 06/28/1972 Make: Rolls-Royce Deutschland Ltd & Co KG Model: Spey 506-14 | Spey 511-14 | Spey 511-8 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: 68-17-05 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1474 AD NUMBER: 68-17-05 SUBJECT HEADING: ROLLS-ROYCE Models 506-14, 510-14, 511-8, and 511-14 Engines ACTION: SUMMARY: DATES: Effective June 28, 1972. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 68-17-05 ROLLS-ROYCE: Amdt. 39-636 as amended by Amendment 39-1318 is further amended by Amendment 39-1474. Applies to Spey Engines Models 506-14, 510-14, 511-8, and 511-14. Compliance required as indicated, unless already accomplished. To prevent or contain a possible failure of the H.P. center section air duct and thereby prevent possible secondary powerplant damage, accomplish the following: (a) Within the next 300 hours time in service after the effective date of this AD, visually inspect (with the aid of a mirror as necessary) the high pressure air system center section duct, P/Ns EU.29670A and EU.63415A, particularly adjacent to welds, for cracks (discoloration of the cowling and engine adjacent to the duct may be indicative of a duct crack), and incorporate a stainless steel wire braid wrap around the high pressure air system center section duct, P/Ns EU.29670A and EU.63415A, in accordance with Rolls-Royce Service Bulletin No. SP. 75-86, dated November 20, 1967, or later ARB-approved or an equivalent approved by the Chief, Aircraft Certification Staff, FAA, Europe, Africa and Middle East Region. (b) At the next scheduled aircraft inspection when the engine is uncowled after compliance with paragraph (a), and thereafter at intervals not to exceed 1,000 hours' time in service from the last inspection, inspect (with the aid of a mirror as necessary) the exposed high pressure air system center section duct for signs of cracking and the stainless steel wire braid wrap for security, distortion, and discoloration. NOTE: Distortion or discoloration of the wire wrap may be indicative of a duct crack. (c) If defects are found during the inspections required by paragraphs (a) and (b), before further flight, replace, as required, the center section duct with a serviceable P/N EU.29670A or P/N EU.63415A duct and a new stainless steel wire braid wrap. (d) Upon the request of an operator, an FAA maintenance inspector, subject to prior approval of the Chief, Aircraft Certification Staff, FAA, Europe, Africa and Middle East Region, may adjust the repetitive inspection interval specified in this AD to permit compliance at an established inspection period of the operator, if the request contains substantiating data to justify the increase for such operator. Amendment 39-636 became effective September 14, 1968. Amendment 39-1318 became effective October 12, 1971. This Amendment 39-1474 becomes effective 28 June 1972. 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
2017-10-25
final ruleAirworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG Turbofan Engines
Unsafe Condition: Failure to replace an affected HPC stage 12 rotor disk before exceeding the revised life limits could lead to an uncontained engine failure, possibly resulting in damage to, and/or reduced control ...
2002-18-03
final ruleAirworthiness Directives; Rolls-Royce plc Models Spey 506-14A, 555-15, 555-15H, 555-15N, and 555-15P Turbojet Engines
Unsafe Condition: Failure of stage 2 low pressure turbine (LPT) blades, which could result in an engine shutdown.
94-25-09
final ruleAirworthiness Directives; Rolls-Royce, plc Spey Series Turbofan Engines
Unsafe Condition: Cracking and corrosion pitting in stage 1 and stage 2 high pressure turbine (HPT) and low pressure turbine (LPT) disks may result in an HPT or LPT disk burst and uncontained engine failure.
94-23-09
final ruleAirworthiness Directives; Rolls-Royce, plc Spey Series Turbofan Engines
Unsafe Condition: Cracking of the seventh stage high pressure compressor (HPC) disk due to corrosion, which may result in an uncontained engine failure.