AD 73-15-02

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AD Number:
73-15-02
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
PRATT & WHITNEY Models JT3D-1, JT3D-1-MC6, JT3D-1-MC7, JT3D-3 and JT3D-3B Engines
Subject:
Turbine Case Lug
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
09/14/1973
Make:
Pratt & Whitney Division
Model:
JT3D-1 | JT3D-1-MC6 | JT3D-1-MC7 | JT3D-3 | JT3D-3B
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Superseded AD: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Superseded By: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: 73-15-02
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-1712

AD NUMBER:   73-15-02

SUBJECT HEADING:   PRATT & WHITNEY Models JT3D-1, JT3D-1-MC6, JT3D-1-MC7, JT3D-3 and JT3D-3B Engines

ACTION:  

SUMMARY:  

DATES:   Effective September 14, 1973.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
73-15-02 PRATT & WHITNEY: Amdt. 39-1687 as amended by Amendment 39-1712. Applies to all JT3D-1, JT3D-1-MC6, JT3D-1-MC7, JT3D-3 and JT3D-3B model engines containing turbine nozzle case Part Numbers 399065, 496859, 570618, 626669, 669045, 669047, 694937, 694938, 390197, 694935 and 691326 incorporating vented 2nd stage outer airseals.

Compliance required as follows:

To preclude possible turbine blade or disc failures resulting from turbine case lug failures, inspect the turbine nozzle case for missing lugs by performing Ultrasonic, Isotope or Visual inspection at the time intervals specified below.

First inspection, 1,000 hours time in service after the effective date of this AD unless already accomplished.

(a) If there are no missing lugs, repeat the inspection every 1,000 hours time in service thereafter.

(b) If one lug is found missing, repeat the inspection every 100 hours time in service.

(c) If two or three lugs are found missing, remove the engine within the next 50 hours time in service.

(d) If four or more lugs are missing, remove from service immediately.

Turbine cases may be repaired in accordance with the procedures outlined in the Overhaul Manual, Section 72-51-2, or replaced.

Upon submission of substantiating data through an FAA Maintenance Inspector, the Chief, Engineering and Manufacturing Branch, FAA, New England Region, may adjust the compliance time.

NOTE: Pratt & Whitney Service Bulletin 3993, or later FAA approved revisions pertain to this same subject.
Amendment 39-1687 became effective August 18, 1973.

This Amendment 39-1712 becomes effective September 14, 1973.

FOOTER: